300 I6 EFI performance upgrades

Moderator: Mod Squad

88F15088
Registered User
Posts: 105
Joined: Mon Sep 11, 2017 12:24 pm

Re: 300 I6 EFI performance upgrades

Post #151 by 88F15088 » Mon Mar 05, 2018 12:05 am

bumpsidetreasures wrote:Did I read correctly, you're after a 6BT turbo / accessories? I'm trying to imagine that. Maybe I'm way out in left field, and excuse me if I am. But Isn't that serious overkill for the kind of exhaust flow this motor is going to deliver? School me..


If I am not mistaken, an HX35 turbo comes from a 6BT and has been used in a few builds I have seen on the forums. In particular: /viewtopic.php?f=22&t=71783

I unfortunately didn't get the time to make it out to the junkyard. I called several and couldn't find anyone with a Dodge diesel. I think my best bet is to buy a eBay knockoff for around $150 (maybe unwise) or I buy a used Holset for $300-350.

bumpsidetreasures wrote:I do have a pretty nice set of C3AE 240 Rods if you're still in the market for those.

Check your PM

Would the 240 rods be my best bet with a turbo application? I will not be revving more than 5000-5500 RPM, my stock motor screams before it even gets to 4k.

88F15088
Registered User
Posts: 105
Joined: Mon Sep 11, 2017 12:24 pm

Re: 300 I6 EFI performance upgrades

Post #152 by 88F15088 » Mon Mar 05, 2018 7:59 pm

I called my machinist and everything is pretty much ready to be done as soon as I give him the OK. I just wanted to see what you guys thought so I don't miss anything.

He's already magnafluxed and hot tanked everything as well as removed freeze plugs and oil plugs.

The head will need to be machined down .009" and the block .007"
He can bore it to .030 over. For an additional $50-60 he will install the cam bearings and freeze plugs I give him. He will align hone the main caps for ARP bolts. I was told the valve guides will need to be replaced. The crank will be polished and he will do a valve job, I asked him about the performance job and he said it would be around $100-150 extra to do. I think the total to do everything came out to around $900ish, which in my opinion seems a bit high, but I have nothing to base it on since I have never had machine work done to an engine.

That doesn't include shot peening and resizing the rods for ARP bolts ($150), or pressing the pistons to the rods ($70).

pmuller9
Registered User
Posts: 2170
Joined: Tue Aug 06, 2013 12:33 am
Location: Columbus, Indiana

Re: 300 I6 EFI performance upgrades

Post #153 by pmuller9 » Mon Mar 05, 2018 8:05 pm

Which rods and pistons are you planning on using?

88F15088
Registered User
Posts: 105
Joined: Mon Sep 11, 2017 12:24 pm

Re: 300 I6 EFI performance upgrades

Post #154 by 88F15088 » Mon Mar 05, 2018 9:08 pm

pmuller9 wrote:Which rods and pistons are you planning on using?


Bumpsidetreasures has a set of C3AE 240 rods for sale. I will be ordering custom Autotech forged pistons no matter the rod choice. I wanted your opinion if I should re-use the 300 rods or go with the 240 rods for a turbo application.

pmuller9
Registered User
Posts: 2170
Joined: Tue Aug 06, 2013 12:33 am
Location: Columbus, Indiana

Re: 300 I6 EFI performance upgrades

Post #155 by pmuller9 » Tue Mar 06, 2018 3:29 pm

88F15088 wrote:Bumpsidetreasures has a set of C3AE 240 rods for sale. I will be ordering custom Autotech forged pistons no matter the rod choice. I wanted your opinion if I should re-use the 300 rods or go with the 240 rods for a turbo application.

The EFI head shaved .009 will only have around a 67cc chamber.
You will need around a 35cc piston dish to get a 8.5:1 compression ratio with that chamber volume.
The piston for the 240 rod only has a 1.2" CH which doesn't leave enough room for that size dish.

You will need to use the stock 6.21" rod.
There is also the option of using the 6.385" Eagle CRS6385B3D rod.

88F15088
Registered User
Posts: 105
Joined: Mon Sep 11, 2017 12:24 pm

Re: 300 I6 EFI performance upgrades

Post #156 by 88F15088 » Wed Mar 07, 2018 12:14 am

What is a safe number to push the stock rods to? I can't find the exact thread, but I think I remember seeing around 350-400HP.

If this motor stock makes around 145HP, and I am getting valve work, possibly doing some light porting myself, getting a cam (I have a Crower turbo cam on order, this particular one: https://www.dropbox.com/s/qufkzkwyxoz8o ... m.jpg?dl=0), and tuning with Megasquirt, I should be making around 175-200HP before the turbo.
pmuller9 wrote:15 lbs with a large intercooler with good airflow will increase the engine power around 90%. 17 lbs will double the power


Unless I am being optimistic, 17lbs of boost is near or at the threshold of the stock rods.

pmuller9
Registered User
Posts: 2170
Joined: Tue Aug 06, 2013 12:33 am
Location: Columbus, Indiana

Re: 300 I6 EFI performance upgrades

Post #157 by pmuller9 » Wed Mar 07, 2018 1:00 am

Those HP numbers for the stock rod limit is correct but needs clarification.

In order to get Naturally Aspirated 400 HP out of a 300 six you need to push the rpm past 6000 where failure is due to stretch.
ARP rod bolts help a great deal but the spit hole in the big end is still a point of failure.

In your case the rods see low rpm but very high torque or rod compression.
The failure mode is typically a bent rod beam just before the small end especially if there is detonation. Been there, done that.

That's why I pointed out the use of the Eagle "H" beam as an alternative to using the stock rods.
http://www.excessiveracing.com/ESP-CRS6385B3D.aspx

User avatar
THE FRENCHTOWN FLYER
VIP Member
Posts: 5465
Joined: Sat Nov 09, 2002 9:25 pm
Location: FRENCHTOWN

Re: 300 I6 EFI performance upgrades

Post #158 by THE FRENCHTOWN FLYER » Wed Mar 07, 2018 4:22 pm

The stock rods have a design "factor of safety" of 2.6. Now that does NOT mean they are capable of withstanding 2.6 times the stock horsepower level. Those astute engineer types can calculate the RPM the rod will withstand making a few assumptions about piston weight, cylinder pressures etc. (heck, for all I know there's probably an "app" for that or at least a website you can go to to plug in the numbers).

But I ask why, if one wants to triple the output of a given engine, would one skimp on getting a performance rod to insure all your hard work does not end in a rod failure.

I sure would not trust a stock rod - spit hole or not - at those power levels. They could be made to work for some finite life I suppose, but things like marginally designed parts keep me awake at night. I've built some U-flow engines in the 300 - 400 HP range (requiring a ton of work on all the moving components) and one of the first upgrades was better rods.
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

88F15088
Registered User
Posts: 105
Joined: Mon Sep 11, 2017 12:24 pm

Re: 300 I6 EFI performance upgrades

Post #159 by 88F15088 » Thu Mar 08, 2018 1:12 am

This is good info, I guess I know which rods I will be using. I need to stop hanging out on this forum or I will run out of money! :D

In order to run these rods, I will need to have .030" shaved from the crank journals and change a few things when I order my pistons. What bearings do I need to use?

THE FRENCHTOWN FLYER wrote:But I ask why, if one wants to triple the output of a given engine, would one skimp on getting a performance rod to insure all your hard work does not end in a rod failure.


Might as well spend a little extra to do it right the first time so I don't have to do it all again.

pmuller9
Registered User
Posts: 2170
Joined: Tue Aug 06, 2013 12:33 am
Location: Columbus, Indiana

Re: 300 I6 EFI performance upgrades

Post #160 by pmuller9 » Thu Mar 08, 2018 10:14 am

Using the Eagle rods cost less than using the stock rods.
The stock rods get magnafluxed, polished, shot peened and resized with ARP bolts.
You also have to pay to have the old pins pressed out and new pins pressed in which includes heating the small end of the rod.
Then you pay $40 extra for the set of Ford .975" pins when you buy the custom pistons.
The stock rods will need to be balanced for sure while the Eagle rods may not.

The Eagle rods are floating pin and you can also sell the 2 extra rods from the set of 8.
PM sent.

Those rods use the SBC bearings for the 2.100" journal.
the 300 crank journal is turned down .023"
Buy the bearings first. Then your machinist can torque the rod bolts with the the bearings in place and measure exactly how much the crank rod journals need to be turned to get the proper bearing clearance.

The rods only have a bevel on one side of the big end because they sit side by side as pairs in a V8.
Your machinist will need to bevel the other side.
Example: https://www.dropbox.com/s/nrmpmqhc5ni5l ... e.jpg?dl=0
Last edited by pmuller9 on Thu Mar 08, 2018 12:13 pm, edited 9 times in total.

Stonebreaker
Registered User
Posts: 24
Joined: Sun Feb 25, 2018 5:09 pm

Re: 300 I6 EFI performance upgrades

Post #161 by Stonebreaker » Thu Mar 08, 2018 10:16 am

+1 on the spend a little more now or pay big later philosophy. Drag racers have a saying - Cheap, Fast, Reliable - pick any two.

88F15088
Registered User
Posts: 105
Joined: Mon Sep 11, 2017 12:24 pm

Re: 300 I6 EFI performance upgrades

Post #162 by 88F15088 » Thu Mar 08, 2018 10:59 pm

Are these the correct bearings? https://www.summitracing.com/tx/parts/s ... /overview/

It shows for a 5.3, 5.7, etc Chevy, which is the small block.

At present I am going to stick with the stock valves. Unless you guys say otherwise, I am going to have my machinist do the work to the block and head. Is there a great benefit to be had from oversize valves? What is involved in such an upgrade?

pmuller9
Registered User
Posts: 2170
Joined: Tue Aug 06, 2013 12:33 am
Location: Columbus, Indiana

Re: 300 I6 EFI performance upgrades

Post #163 by pmuller9 » Thu Mar 08, 2018 11:28 pm

Those are the correct size bearings but not the correct bearing material for your crank
Your machinist will polish the crank journals so you will need a softer bearing to work with cast iron.
Let your machinist choose or supply the bearings.

You shouldn't put oversize valves in a EFI head unless you modify the combustion chamber to unshroud the valves.
This thread shows what is involved in both the chamber modifications and the portwork.
Chamber modifications start at post# 11
viewtopic.php?f=22&t=77808

The larger valves and port work will allow you to make a lot more torque above 3000 rpm which is where you gain horsepower.

88F15088
Registered User
Posts: 105
Joined: Mon Sep 11, 2017 12:24 pm

Re: 300 I6 EFI performance upgrades

Post #164 by 88F15088 » Fri Mar 09, 2018 12:11 am

Stock valves it is!

I will most likely be doing some light port work, but that's about it. I think I will be making plenty of power, let's not go crazy now!

That should do it for the machine work. I just won't have him touch the crank until I can get the rods down to him.

88F15088
Registered User
Posts: 105
Joined: Mon Sep 11, 2017 12:24 pm

Re: 300 I6 EFI performance upgrades

Post #165 by 88F15088 » Fri Mar 16, 2018 9:50 am

pmuller9 wrote:You shouldn't put oversize valves in a EFI head unless you modify the combustion chamber to unshroud the valves.
This thread shows what is involved in both the chamber modifications and the portwork.
Chamber modifications start at post# 11
viewtopic.php?f=22&t=77808

The larger valves and port work will allow you to make a lot more torque above 3000 rpm which is where you gain horsepower.


Would I be better off using the carb head? It seems I can get one in a junkyard for under $40.

pmuller9
Registered User
Posts: 2170
Joined: Tue Aug 06, 2013 12:33 am
Location: Columbus, Indiana

Re: 300 I6 EFI performance upgrades

Post #166 by pmuller9 » Fri Mar 16, 2018 10:36 am

88F15088 wrote:Would I be better off using the carb head? It seems I can get one in a junkyard for under $40.

Yes
The carb head has more chamber volume than the EFI head so the piston dish volume will be less.
The carb head doesn't have the valve shrouding and will accommodate bigger valves with less work.
The carb head also doesn't have the problem with cracks like a used EFI head although magnafluxing a used carb head is still recommended.

88F15088
Registered User
Posts: 105
Joined: Mon Sep 11, 2017 12:24 pm

Re: 300 I6 EFI performance upgrades

Post #167 by 88F15088 » Fri Mar 16, 2018 12:57 pm

It looks like I will want a 1985 or later head as it has pedestal rocker arms and will allow me to install the Scorpion rockers if I choose. What must be done to the carb head for oversize valves besides the machine work?

Some research shows SI Valves sells the oversize 1.94 and 1.60 valves in both 4.810 and 4.750 lengths.

User avatar
THE FRENCHTOWN FLYER
VIP Member
Posts: 5465
Joined: Sat Nov 09, 2002 9:25 pm
Location: FRENCHTOWN

Re: 300 I6 EFI performance upgrades

Post #168 by THE FRENCHTOWN FLYER » Fri Mar 16, 2018 6:47 pm

Depends.
If all you want is bigger valves then all that is needed is to size the guides, cut the seats for bigger valves, and do a valve job.

But you can do much more -

cut the guides down for positive stem seals and increased retainer clearance
scribe the chambers out to the bores and open the chamber
blend the entry cut and throat cut into the bowl / chamber
back-cut the intake valve with a 30* cut
polish the combustion chamber to a mirror finish
Last edited by THE FRENCHTOWN FLYER on Mon Sep 24, 2018 10:10 am, edited 1 time in total.
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

88F15088
Registered User
Posts: 105
Joined: Mon Sep 11, 2017 12:24 pm

Re: 300 I6 EFI performance upgrades

Post #169 by 88F15088 » Thu Mar 22, 2018 9:50 pm

A somewhat nearby junkyard has an '82 F100 with the 4.9 in it, I hope it still has the cylinder head.

If I get my hands on a carb cylinder head, I am planning to do most of the stuff outlined in this video: https://www.youtube.com/watch?v=iejDWSQEsqI

88F15088
Registered User
Posts: 105
Joined: Mon Sep 11, 2017 12:24 pm

Re: 300 I6 EFI performance upgrades

Post #170 by 88F15088 » Mon Apr 02, 2018 11:25 pm

I found a carb cylinder head at the junkyard and am having my machinist clean and magnaflux it before I begin investing a lot of time in porting/polishing it.

I got my EFI head back from him today and went at one of the chambers with a 120 grit flap disk for a dremel. I have the 80 grit cartridge rolls but my 1 gallon pancake air compressor can't feed the die grinder for more than a second or two before the pressure drops significantly. I will begin practice porting when I get a new air compressor.

With the cartridge rolls it would be a lot easier to get in the small crevices, with the flap wheel it's nearly impossible.

Before:
IMG_9398.JPG


After, the rough areas I was unable to reach with the flap wheel.
IMG_9399.JPG

IMG_9400.JPG
You do not have the required permissions to view the files attached to this post.

n8in8or
Registered User
Posts: 57
Joined: Sun Dec 31, 2017 6:40 pm

Re: 300 I6 EFI performance upgrades

Post #171 by n8in8or » Tue Apr 03, 2018 7:26 am

That looks like a good start. I bet that took you a long time with the Dremel! How many flap wheels did you go through to get that far? The cartridge rolls will make it a lot easier to reach some areas and make different contours you are looking for, but once you get a larger compressor you'll really want to get a small assortment of carbide burrs to do the roughing in and then follow it up with the cartridge rolls - you'll use a LOT fewer cartridge rolls that way. I look forward to watching the progress.
1994 F150 4x4, 4.9 E4OD. EFI turbo build in progress....

88F15088
Registered User
Posts: 105
Joined: Mon Sep 11, 2017 12:24 pm

Re: 300 I6 EFI performance upgrades

Post #172 by 88F15088 » Tue Apr 03, 2018 9:53 am

It took about 30-45 minutes and used one flap wheel, which is pretty much shot now.

I have been reading your thread and will be picking up some carbide burrs.

n8in8or
Registered User
Posts: 57
Joined: Sun Dec 31, 2017 6:40 pm

Re: 300 I6 EFI performance upgrades

Post #173 by n8in8or » Tue Apr 03, 2018 7:12 pm

If you’re on a budget, you can usually pick up a nice assortment for not a terrible cost at local swap meets.
1994 F150 4x4, 4.9 E4OD. EFI turbo build in progress....

88F15088
Registered User
Posts: 105
Joined: Mon Sep 11, 2017 12:24 pm

Re: 300 I6 EFI performance upgrades

Post #174 by 88F15088 » Thu Apr 12, 2018 11:11 pm

I picked up the block and carb head from the machinist. I also dropped off the forged rods so he can grind down the rod journals.

There are some concerning marks on the block, which at first look like cracks, but are hopefully just part of the casting.

IMG_3842.JPG

IMG_3844.JPG


I also started to take a look at how I am going to approach the carb head. I looked at how close the valves come to the chamber walls and am unsure how oversize valves will fit, but it looks like people have oversized valves with success.

The areas circled in red look like they would be restrictions, however, the scribe around the bores comes right to it, so it doesn't look like I can improve that area any. Maybe this weekend I will have a chance to work on the ports and smoothing out the combustion chamber.

IMG_3845.JPG

IMG_3846.JPG
You do not have the required permissions to view the files attached to this post.

User avatar
THE FRENCHTOWN FLYER
VIP Member
Posts: 5465
Joined: Sat Nov 09, 2002 9:25 pm
Location: FRENCHTOWN

Re: 300 I6 EFI performance upgrades

Post #175 by THE FRENCHTOWN FLYER » Fri Apr 13, 2018 9:48 am

I would not worry about the circled casting imperfection - it is in a low-stress portion of the block and there is a lot of meat there. I actually notch my bores in that region to make room for aftermarket rods. Of more importance is to grind back all the internal casting flash, like that shown in the cam tunnel region. That is where it is easier for a crack to begin, and once a crack begins it is relatively easy for it to continue to propagate. If it makes you feel better about the circled area you could grind that area flat and look for a crack but I don't think you'll see one there.
Re: the close clearance of the valves to the chamber wall - yes, any time the valve is shrouded by less than about 1/4 of the valve diameter that region becomes a restriction. But you can't expect a wedge chamber to be 100% free of wall shrouding because that would mean the valve would be undersized. A common racer trick is to offset the head on the block so that shrouding of the wall is diminished, and some engines even notch the block around there. Other guys offset bore the intake valve guides closer to the middle of the chamber. And of course scribing the bore wall and opening the chamber is a good thing and easy to do.

I like to use 1.900" intake valves. Cut down from commonly available (read: cheap)1.94 Chevy valves. I know they are too small for a 50 ci cylinder but they are a good compromise for a street / strip engine without doing more exotic head mods.
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

88F15088
Registered User
Posts: 105
Joined: Mon Sep 11, 2017 12:24 pm

Re: 300 I6 EFI performance upgrades

Post #176 by 88F15088 » Fri Apr 13, 2018 12:20 pm

Connecting rods came in:
IMG_9477.JPG

IMG_9478.JPG
You do not have the required permissions to view the files attached to this post.

pmuller9
Registered User
Posts: 2170
Joined: Tue Aug 06, 2013 12:33 am
Location: Columbus, Indiana

Re: 300 I6 EFI performance upgrades

Post #177 by pmuller9 » Fri Apr 13, 2018 7:36 pm

Nice Connecting Rods!
I like the way the beam stays wide at the small end.
Callies/Compstar makes a good rod.

Can't wait to see the pistons that will go on those Bad Boys.

n8in8or
Registered User
Posts: 57
Joined: Sun Dec 31, 2017 6:40 pm

Re: 300 I6 EFI performance upgrades

Post #178 by n8in8or » Fri Apr 13, 2018 8:08 pm

X2....this is getting exciting!
1994 F150 4x4, 4.9 E4OD. EFI turbo build in progress....

88F15088
Registered User
Posts: 105
Joined: Mon Sep 11, 2017 12:24 pm

Re: 300 I6 EFI performance upgrades

Post #179 by 88F15088 » Tue Apr 17, 2018 11:15 pm

I picked up a Harbor Freight 29 gallon belt driven compressor and a die grinder, also from Harbor Freight.

I found a machinist surplus shop that has carbide burrs so I picked up two. Tonight I spent half an hour experimenting with the die grinder on the head. It seems like the bit wobbles around a bit and "chatters" when you are grinding. I think the grinder itself is to blame, as I put the bit in a drill and spun it and it doesn't visibly wobble as it does in the die grinder (then again it's spinning considerably faster in the grinder). I believe the proper term here is runout. It may not be a bad idea to invest in a quality grinder.

Also, I changed my oil last weekend and the engine has developed a slight tapping/knocking sound that only happens when the engine is cold, then goes away when warm. I am hoping this is just a lifter tick or something simple. Surely I can't mess up a simple oil change :)

Unrelated, I picked up one of Harbor Freight's new Vulcan Omnipro 220 welders at a parking lot sale. It was half off of the list price of $850! This machine does MIG, TIG, and stick welding. I have been practicing flux core until I can get some shielding gas for MIG. Then I will practice TIG. This helps me so I can fab up a turbo manifold when the time comes.

User avatar
bubba22349
Global Moderator
Posts: 8243
Joined: Sun Jan 03, 2010 4:46 pm
Location: Flagstaff, Az. 86005 near the old Route 66

Re: 300 I6 EFI performance upgrades

Post #180 by bubba22349 » Wed Apr 18, 2018 12:20 am

Sometimes the bit chatters due to the RPM you can use a valve to very the air flow to stop it. Good luck :nod: :thumbup:
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

88F15088
Registered User
Posts: 105
Joined: Mon Sep 11, 2017 12:24 pm

Re: 300 I6 EFI performance upgrades

Post #181 by 88F15088 » Wed Apr 18, 2018 1:25 am

I came across these little ultrasonic thickness testers on eBay. I wonder if that would be a worthwhile purchase so I know how much material is left before grinding through a port into the water jacket.

https://www.ebay.com/itm/272360520066

n8in8or
Registered User
Posts: 57
Joined: Sun Dec 31, 2017 6:40 pm

Re: 300 I6 EFI performance upgrades

Post #182 by n8in8or » Wed Apr 18, 2018 7:32 am

88F15088 wrote:I came across these little ultrasonic thickness testers on eBay. I wonder if that would be a worthwhile purchase so I know how much material is left before grinding through a port into the water jacket.

https://www.ebay.com/itm/272360520066


I don't know how well those work, but I'd be happy for you to be a guinea pig! :beer:

If that does work I couldn't see that being incredibly helpful for porting!
1994 F150 4x4, 4.9 E4OD. EFI turbo build in progress....

88F15088
Registered User
Posts: 105
Joined: Mon Sep 11, 2017 12:24 pm

Re: 300 I6 EFI performance upgrades

Post #183 by 88F15088 » Wed Apr 18, 2018 11:43 pm

n8in8or wrote:If that does work I couldn't see that being incredibly helpful for porting!


I was thinking it would help me get the ports as large as possible without cutting through them (into the water jacket). I am going to get an intake/exhaust manifold gasket and cut the ports out to the gasket.

n8in8or
Registered User
Posts: 57
Joined: Sun Dec 31, 2017 6:40 pm

Re: 300 I6 EFI performance upgrades

Post #184 by n8in8or » Thu Apr 19, 2018 7:49 am

88F15088 wrote:
n8in8or wrote:If that does work I couldn't see that being incredibly helpful for porting!


I was thinking it would help me get the ports as large as possible without cutting through them (into the water jacket). I am going to get an intake/exhaust manifold gasket and cut the ports out to the gasket.


OOPS!! TERRIBLE typo there. I meant to say I COULD see that being incredibly helpful for porting. Sorry about the error. I totally agree with you!
1994 F150 4x4, 4.9 E4OD. EFI turbo build in progress....

User avatar
THE FRENCHTOWN FLYER
VIP Member
Posts: 5465
Joined: Sat Nov 09, 2002 9:25 pm
Location: FRENCHTOWN

Re: 300 I6 EFI performance upgrades

Post #185 by THE FRENCHTOWN FLYER » Thu Apr 19, 2018 9:35 am

88F15088 wrote:
n8in8or wrote:If that does work I couldn't see that being incredibly helpful for porting!

... I am going to get an intake/exhaust manifold gasket and cut the ports out to the gasket.

Don't remove any metal off the floors of the ports - you'll just hurt yourself. Enlarging the ports will likely only help if the valve size and valve bowls are increased. In the early stages of this engines R&D development the ports were actually larger in that area and flow was increased when metal was added. If you have access to S.A.E. technical papers there was an excellent one written on this engine. I think the author was either Al Rominski or Dan Spurlin - two former mentors and heroes. Search it out.
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

drag-200stang
Registered User
Posts: 923
Joined: Sun Oct 19, 2003 6:10 pm
Location: Michigan

Re: 300 I6 EFI performance upgrades

Post #186 by drag-200stang » Thu Apr 19, 2018 9:38 am

On porting, I like the 6'' long burrs and wrap an oiled piece of leather around it and control it like a pencil...It gives you great control at the load ,.O yes it gets hot..The double cut do not make silvers like single cut and cut smoother.
66 Mustang Coupe
200 turbo w/lenco 4-spd
stock adj. rockers, stock timing set, ARP studs
best 1/4 mile ET 9.85/best mph 139 on 8 lbs progressing to 15 lbs boost
Went 9's when 10's was fast.

Wesman07
Registered User
Posts: 329
Joined: Tue Aug 23, 2016 10:00 am

Re: 300 I6 EFI performance upgrades

Post #187 by Wesman07 » Thu Apr 19, 2018 10:38 am

THE FRENCHTOWN FLYER wrote:
88F15088 wrote:
n8in8or wrote:If that does work I couldn't see that being incredibly helpful for porting!

... I am going to get an intake/exhaust manifold gasket and cut the ports out to the gasket.

Don't remove any metal off the floors of the ports - you'll just hurt yourself. Enlarging the ports will likely only help if the valve size and valve bowls are increased. In the early stages of this engines R&D development the ports were actually larger in that area and flow was increased when metal was added. If you have access to S.A.E. technical papers there was an excellent one written on this engine. I think the author was either Al Rominski or Dan Spurlin - two former mentors and heroes. Search it out.



Great piece of info!
In-lines we trust

86 f150 300 efi with advanced stock cam. Np435, Dana 60/ 10.25, 35" BFG's, four link front suspension with 12" travel fox coil overs, custom deaver leaf pack in the rear.

n8in8or
Registered User
Posts: 57
Joined: Sun Dec 31, 2017 6:40 pm

Re: 300 I6 EFI performance upgrades

Post #188 by n8in8or » Thu Apr 19, 2018 10:39 am

drag-200stang wrote:On porting, I like the 6'' long burrs and wrap an oiled piece of leather around it and control it like a pencil...It gives you great control at the load ,.O yes it gets hot..

Nice tip.
1994 F150 4x4, 4.9 E4OD. EFI turbo build in progress....

88F15088
Registered User
Posts: 105
Joined: Mon Sep 11, 2017 12:24 pm

Re: 300 I6 EFI performance upgrades

Post #189 by 88F15088 » Thu Apr 19, 2018 10:22 pm

THE FRENCHTOWN FLYER wrote:Don't remove any metal off the floors of the ports - you'll just hurt yourself. Enlarging the ports will likely only help if the valve size and valve bowls are increased.


I am planning on grinding the valve bowls and putting in oversize valves. This may be a stupid question, but the floor is the bottom of the port when the chambers are facing down, right?

User avatar
THE FRENCHTOWN FLYER
VIP Member
Posts: 5465
Joined: Sat Nov 09, 2002 9:25 pm
Location: FRENCHTOWN

Re: 300 I6 EFI performance upgrades

Post #190 by THE FRENCHTOWN FLYER » Fri Apr 20, 2018 9:27 am

yup
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

88F15088
Registered User
Posts: 105
Joined: Mon Sep 11, 2017 12:24 pm

Re: 300 I6 EFI performance upgrades

Post #191 by 88F15088 » Sat Apr 21, 2018 1:01 am

Here is what I have accomplished so far. This is my first time porting so would like you guys' opinions on how I did.

As you can see there isn't much material to be "gasket matched"
IMG_3969.JPG


First port completed. I roughed it out with the carbide bit then followed up with an 80 grit cartridge roll to smooth it out a bit.
IMG_3970.JPG

IMG_3971.JPG


As you can see I nicked the valve seat a bit. Hopefully a valve job would smooth it out. This is why I am practicing on a scrap head.
IMG_3972.JPG


The valve boss is a work in progress. I have a 6" fine tip bit but I think the issue is my grinder has too much play. When you have the 6" bit in, it flops around so much it is unusable. What do you expect for a $7 grinder at Harbor Freight?
IMG_3973.JPG


Unworked ports:
IMG_3974.JPG

IMG_3975.JPG
You do not have the required permissions to view the files attached to this post.

User avatar
THE FRENCHTOWN FLYER
VIP Member
Posts: 5465
Joined: Sat Nov 09, 2002 9:25 pm
Location: FRENCHTOWN

Re: 300 I6 EFI performance upgrades

Post #192 by THE FRENCHTOWN FLYER » Sat Apr 21, 2018 10:35 am

Strive for a mirror-like finish on both the combustion chambers and the tops of the pistons. The shinier you can make it the more heat / pressure is contained inside and hence more power. I finish mine with a felt polishing cone and various grades of compound. In the case of these pistons I did, notice how the image of the cardboard box is reflected off the piston top.
[Thanks pmuller9 for explaining how to post pictures.]
Image
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

Wesman07
Registered User
Posts: 329
Joined: Tue Aug 23, 2016 10:00 am

Re: 300 I6 EFI performance upgrades

Post #193 by Wesman07 » Sat Apr 21, 2018 2:02 pm

Are there holes on the piston top that bypass the rings??
In-lines we trust

86 f150 300 efi with advanced stock cam. Np435, Dana 60/ 10.25, 35" BFG's, four link front suspension with 12" travel fox coil overs, custom deaver leaf pack in the rear.

User avatar
THE FRENCHTOWN FLYER
VIP Member
Posts: 5465
Joined: Sat Nov 09, 2002 9:25 pm
Location: FRENCHTOWN

Re: 300 I6 EFI performance upgrades

Post #194 by THE FRENCHTOWN FLYER » Sat Apr 21, 2018 2:31 pm

Those are what are referred to as "gas ported" pistons. The theory is to use an extremely low friction, low tension ring, drill holes in the top of the piston precisely into the backside of the top ring land. That way the only time the rings press tightly against the bores is when the compression forces the rings up against the bores.

BTW those are for a 240 engine and are available. Arias. Hollow dome. Low run time.
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

Wesman07
Registered User
Posts: 329
Joined: Tue Aug 23, 2016 10:00 am

Re: 300 I6 EFI performance upgrades

Post #195 by Wesman07 » Sat Apr 21, 2018 4:10 pm

That’s a genious idea! I could see why a radial gas port piston would be limited service... but why vertical?

What do the holes under the top do?

Image
In-lines we trust

86 f150 300 efi with advanced stock cam. Np435, Dana 60/ 10.25, 35" BFG's, four link front suspension with 12" travel fox coil overs, custom deaver leaf pack in the rear.

User avatar
THE FRENCHTOWN FLYER
VIP Member
Posts: 5465
Joined: Sat Nov 09, 2002 9:25 pm
Location: FRENCHTOWN

Re: 300 I6 EFI performance upgrades

Post #196 by THE FRENCHTOWN FLYER » Sat Apr 21, 2018 5:02 pm

Those are two different methods of accomplishing essentially the same thing. I think drilling thru the tops is an older method. Milling the side notches requires more sophisticated machinery.
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

88F15088
Registered User
Posts: 105
Joined: Mon Sep 11, 2017 12:24 pm

Re: 300 I6 EFI performance upgrades

Post #197 by 88F15088 » Mon May 07, 2018 1:01 am

As it turns out, the reason my grinder was so unstable was because the shaft had a lot of play in it. I exchanged it for a new one and the new one is so much better. Hopefully in the next few days I will have some time to practice on more ports.

I found a diesel repair shop that has used HX35 turbos for around $300. Hopefully I can get one in the next few weeks and possibly start planning my piping. As of now I want to take the EFI manifolds and make a pipe that will connect them together to a flange for the turbo.

The machinist has finished turning my crank down to fit the forged rods. I am not ordering pistons until I can finish the work on the head so I know how many CCs the chambers are.

88F15088
Registered User
Posts: 105
Joined: Mon Sep 11, 2017 12:24 pm

Re: 300 I6 EFI performance upgrades

Post #198 by 88F15088 » Fri May 25, 2018 1:50 am

I have been caught up with a few things so by the time I get time to start porting the head it's too late to fire up the compressor and make noise with the grinder :( Hopefully this weekend...

When I changed my oil I took a sample and sent it off to a company some of you may be familiar with, called Blackstone Labs. They analyze the oil sample and can tell you the health of your engine. This is how I found out my Jeep has a small head gasket leak. The oil in my truck (1988) had a high content of aluminium, chromium, iron, and copper, which they say is from the piston rings and pistons, and could be a stuck piston ring. Could this be a cracked skirt which is common on these engines? They also said the engine had a high silicon content, which could be from a filtration issue (I found a split EVAP hose shortly after receiving the results). Anyway, I want to use this engine as a guinea pig so I can dyno my ported head and possibly setup the turbo with low PSI to get the MegaSquirt dialed in.

arse_sidewards
Registered User
Posts: 751
Joined: Mon Jan 21, 2013 7:18 am

Re: 300 I6 EFI performance upgrades

Post #199 by arse_sidewards » Fri May 25, 2018 9:08 am

THE FRENCHTOWN FLYER wrote:If you have access to S.A.E. technical papers there was an excellent one written on this engine. I think the author was either Al Rominski or Dan Spurlin - two former mentors and heroes. Search it out.


Got any more info that would help locate the papers?

Publication date range?

Are you sure those name spellings are correct?
1994 F150 4x4 8ft, engine is basically stock.

66" leafs, extended radius arms, lockers in both ends, nothing special.

User avatar
THE FRENCHTOWN FLYER
VIP Member
Posts: 5465
Joined: Sat Nov 09, 2002 9:25 pm
Location: FRENCHTOWN

Re: 300 I6 EFI performance upgrades

Post #200 by THE FRENCHTOWN FLYER » Fri May 25, 2018 6:46 pm

The names are correct. You probably have to be a member of S.A.E. or know somebody who is. Used to be they were available to the general public.
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

Return to “240-300 "Big Block" Six Performance”

Who is online

Users browsing this forum: brandoncw, wallen7 and 18 guests