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Search found 896 matches

by MechRick
Sun Oct 29, 2017 4:36 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Despite all, it can tow!
Replies: 13
Views: 3758

Re: Despite all, it can tow!

Always wondered about the drastic differences in factory ratings with lower gears. Then I towed my 5,500 TT with my 3.55 equipped half-ton. Getting that load moving was a struggle. And that was with 3.55's and 31x10.50 tires. Taller gears increase the upward force on the pinion (pinion gear is walki...
by MechRick
Fri Oct 27, 2017 2:54 pm
Forum: 240-300 "Big Block" Six Performance
Topic: bullet proof
Replies: 7
Views: 1635

Re: bullet proof

I've got a 4.9-powered half ton (4680 lbs) and a 7.5-powered 3/4 ton (5760 lbs). The half ton is fine up to 10,000 lbs combined weight as long as what you are towing has reasonable aerodynamics. You won't like the power to weight ratio pulling an enclosed trailer at that weight with the 4.9L. The bi...
by MechRick
Fri Oct 06, 2017 2:02 pm
Forum: 240-300 "Big Block" Six Performance
Topic: '96 300 F150 Options for a bit more power, fuel efficiency, getting rid of missfire.
Replies: 6
Views: 1425

Re: '96 300 F150 Options for a bit more power, fuel efficiency, getting rid of missfire.

http://www.misterfixit.com/dyncompr.htm That's a fairly good explanation. Running compression is useful because the check is being done close to the RPM the symptom is felt. Sometimes a valve will seal when you slow things down. It's good for checking springs and for excessive carbon on valve stems ...
by MechRick
Mon Oct 02, 2017 9:33 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 I6 EFI performance upgrades
Replies: 277
Views: 57381

Re: 300 I6 EFI performance upgrades

If you have a propane bottle, crank it open over each intake runner and see if it smoothes out.
by MechRick
Sun Oct 01, 2017 9:25 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 I6 EFI performance upgrades
Replies: 277
Views: 57381

Re: 300 I6 EFI performance upgrades

88F15088 wrote:At idle the MAP reading is around 95-96 KPA. If I am correct, I think it is supposed to be around 60-70KPA


It should be idling in the 30's or 40's.
by MechRick
Sun Oct 01, 2017 8:43 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 I6 EFI performance upgrades
Replies: 277
Views: 57381

Re: 300 I6 EFI performance upgrades

If you want to control an idle valve with a MS1, the idle transistor will have to be swapped to one that sinks more current. I don't think it's necessary with 2 and 3. Because of the higher than normal fuel pressure these trucks run, fudge the injector flow rate in basic settings. Example: 14 pph in...
by MechRick
Sun Oct 01, 2017 8:31 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 I6 EFI performance upgrades
Replies: 277
Views: 57381

Re: 300 I6 EFI performance upgrades

Are you using stock injectors? If so, you will have to change the number of squirts in the firmware. I ran mine with 24 pph injectors and it ran fine. Switching back to the stock injectors forced me to change settings. Did you run Ford ECT and IAT sensors with the easytherm modifications? I found Me...
by MechRick
Fri Sep 29, 2017 9:03 pm
Forum: 240-300 "Big Block" Six Performance
Topic: '96 300 F150 Options for a bit more power, fuel efficiency, getting rid of missfire.
Replies: 6
Views: 1425

Re: '96 300 F150 Options for a bit more power, fuel efficiency, getting rid of missfire.

Usually when I hear of a low rpm miss that goes away at higher rpm, I suspect a valve seal issue. They don't always show with a cranking compression test. I've had better luck finding it with a running compression test. It could be a vacuum leak at an intake runner. Check to see if the gasket is spl...
by MechRick
Wed Sep 27, 2017 11:52 am
Forum: 240-300 "Big Block" Six Performance
Topic: Hei wiring 10v while cranking
Replies: 3
Views: 900

Re: Hei wiring 10v while cranking

What do you read at the battery while cranking? The starter normally pulls the system voltage down a bit, it's equal to a .7 to 1.0 ohm resistor shorting across the battery terminals.
by MechRick
Sun Sep 24, 2017 2:55 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Hotrod 300
Replies: 7
Views: 3698

Re: Hotrod 300

You've got the 8 lug truck to tow with, that will free you up to do some things to the 300. I wouldn't use the four-speed from the 3/4 ton parts truck. It's not the first trans that pops in my head when thinking 'performance'. Instead consider one of the early AOD autos worked over by someone who kn...
by MechRick
Tue Sep 05, 2017 8:24 am
Forum: Orphan Inlines
Topic: 1984 Ford 2.3L powered Bronco II
Replies: 150
Views: 46109

Re: 1984 Ford 2.3L powered Bronco II

Never got the chance to try it out on slopes. Webers are known for issues on slopes. This one got excess fuel on hard braking, so I imagine it would have problems on a down hill. The injection is worth 2 mpg and some torque.
by MechRick
Mon Sep 04, 2017 9:12 pm
Forum: Orphan Inlines
Topic: 1984 Ford 2.3L powered Bronco II
Replies: 150
Views: 46109

Re: 1984 Ford 2.3L powered Bronco II

The goop is body filler. It makes a level surface for silicone to seal.
It's very capable off road. I haven't had it on extreme trails yet.
My job has me bouncing around states, so I dropped the registration for now...
by MechRick
Fri Sep 01, 2017 12:16 am
Forum: Orphan Inlines
Topic: 1984 Ford 2.3L powered Bronco II
Replies: 150
Views: 46109

Re: 1984 Ford 2.3L powered Bronco II

It's been half a year since I've done any work to the Bronco. Jumped in it to move it a few weeks ago and it was a crank no start. Fuel pump failed (again). I think it may have been a fluke, the fuel system is clean. Warrantied it out, and since this is a trail vehicle, I cut an access hole in the b...
by MechRick
Fri Aug 25, 2017 4:25 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Galvanic corrosion - fasteners and fittings
Replies: 8
Views: 1546

Re: Galvanic corrosion - fasteners and fittings

Of the two forces at work, one you can deal with, the other's effects can be minimized. Galvanism requires an anode and a cathode separated by an electrolyte. In your case, the electrolytes are coolant and salt water. Coolant turns acidic with age, and when sandwiched between two dissimilar metals c...
by MechRick
Mon Aug 21, 2017 4:09 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 pops and gurgles when decelerating
Replies: 11
Views: 1900

Re: 300 pops and gurgles when decelerating

There are two valves on the air injection system, TAD (thermactor air diverter) and TAB (thermactor air bypass). The diverter valve sends air pump air upstream to the exhaust ports (the stainless manifold with six fittings), but only when cold. After dropping into closed loop, the air is routed (div...
by MechRick
Sun Aug 20, 2017 5:22 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 pops and gurgles when decelerating
Replies: 11
Views: 1900

Re: 300 pops and gurgles when decelerating

Anytime you get excess oxygen in the exhaust, from, say, a stuck thermactor bypass valve or broken exhaust manifold/pipe, this can happen.
by MechRick
Mon Jul 31, 2017 12:37 am
Forum: Turbo, Supercharger, and Nitrous
Topic: Supercharger on 300 6 misfiring at top end.
Replies: 4
Views: 1456

Re: Supercharger on 300 6 misfiring at top end.

You need to boost reference the fuel pump. The one blow thru I built I drilled and tapped the diaphragm reference hole in the mechanical fuel pump and ran a manifold vacuum line to that. If you use an electric you will need a fuel pressure regulator with a vacuum/pressure port. Whatever boost you ar...
by MechRick
Sun Jul 30, 2017 7:44 pm
Forum: Turbo, Supercharger, and Nitrous
Topic: Supercharger on 300 6 misfiring at top end.
Replies: 4
Views: 1456

Re: Supercharger on 300 6 misfiring at top end.

Draw through or blow through?
by MechRick
Sat Jul 22, 2017 8:31 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Compression on E85
Replies: 42
Views: 6923

Re: Compression on E85

I ran a turbo Mustang on E85 and 93 octane pump gas (duel fuel). It would ping on 93 in the summer but not on E85. Octane rating is clearly higher than pump gas. I've heard effective octane rating of 105, because it does run cooler than gas. To make best power you need to inject 35-40% more fuel tha...
by MechRick
Sat Jul 08, 2017 2:21 pm
Forum: 240-300 "Big Block" Six Performance
Topic: EFI manifolds or header for '84 F150
Replies: 13
Views: 3216

Re: EFI manifolds or header for '84 F150

http://www.superchevy.com/how-to/exhaust/0505phr-exh/

That's probably the best exhaust article I've seen. Covers V8 tuning more than sixes (pulses are different) but still a great article.
by MechRick
Fri Jul 07, 2017 6:38 pm
Forum: 240-300 "Big Block" Six Performance
Topic: EFI manifolds or header for '84 F150
Replies: 13
Views: 3216

Re: EFI manifolds or header for '84 F150

2.5" single exhaust, or bigger, would work fine. My current setup is EFI manifolds into dual inlet cat, 2.5" pipe into Y with two 2" tailpipes. Two 2" pipes have the same flow as a 2.7" single pipe. It is plenty. If you run duals with no crossover, the exhaust will be much l...
by MechRick
Wed Jul 05, 2017 3:25 pm
Forum: 240-300 "Big Block" Six Performance
Topic: EFI manifolds or header for '84 F150
Replies: 13
Views: 3216

Re: EFI manifolds or header for '84 F150

Clearance may be an issue with EFI exhaust manifolds. Hopefully someone on the forum has actual experience with your combination of parts. I had to do a bit of grinding on an Offy to clear. As far as performance, I switched from EFI manifolds to a header and back to EFI manifolds. Didn't notice much...
by MechRick
Tue Jul 04, 2017 9:07 pm
Forum: Turbo, Supercharger, and Nitrous
Topic: Bench racing Heavy Hauler
Replies: 16
Views: 3313

Re: Bench racing Heavy Hauler

Now that I have a tow mule, if I stumble across an early club or crew cab I might start a project like that, I can take my time with one now.
by MechRick
Mon Jul 03, 2017 10:25 pm
Forum: Turbo, Supercharger, and Nitrous
Topic: Bench racing Heavy Hauler
Replies: 16
Views: 3313

Re: Bench racing Heavy Hauler

For now, I found a 1988 f250 2x4 extended cab long bed, 460 5 speed. Low miles (105k). Should do a better job pulling than my half ton.
by MechRick
Mon Jun 26, 2017 11:02 pm
Forum: Turbo, Supercharger, and Nitrous
Topic: 1994 Microsquirt/turbo
Replies: 13
Views: 3478

Re: 1994 Microsquirt/turbo

A 460 is a big bore (relatively) short stroke engine. They have great potential, but the power delivery is different than the 300. Peak torque on the six happens around 1700 rpm. The big block makes more torque, but at a higher rpm. A turbocharged 300 will run like a diesel. Another good truck optio...
by MechRick
Sun Apr 30, 2017 8:41 pm
Forum: Turbo, Supercharger, and Nitrous
Topic: Fuel efficiency
Replies: 8
Views: 2314

Re: Fuel efficiency

I think you are right. We can further postulate that if the turbo pipe was removed while the engine was at say, 1500 RPM, the RPM would drop a bit. It would be a good test.

I believe the engine would need more throttle to maintain the same output.
by MechRick
Sun Apr 30, 2017 11:37 am
Forum: Turbo, Supercharger, and Nitrous
Topic: Fuel efficiency
Replies: 8
Views: 2314

Re: Fuel efficiency

A/F ratio should have stayed the same. That's the part that convinces me the efficiency of the engine is improving with the turbo in place. Speed density is fueling by two parameters, RPM and MAP. When I removed the turbo outlet tube and the engine went lean, the only possible explanation is the en...
by MechRick
Sat Apr 29, 2017 1:26 pm
Forum: Turbo, Supercharger, and Nitrous
Topic: Fuel efficiency
Replies: 8
Views: 2314

Re: Fuel efficiency

Can a simple set up be reliable? Absolutely. I built mine as a daily driver. It was not a max power effort. The turbo was a junkyard unit that I rebuilt. I even removed the stock Ford oil cooler as I felt it was not necessary for stop light sprints in a light car. MS1 with a wideband. The most expe...
by MechRick
Thu Apr 27, 2017 3:10 pm
Forum: Turbo, Supercharger, and Nitrous
Topic: Fuel efficiency
Replies: 8
Views: 2314

Re: Fuel efficiency

It can, if the turbo is sized correctly. The exhaust gasses are still expanding as they leave the exhaust ports. If the turbo is small enough that there is a small amount of boost during cruise, some of that wasted energy can be recycled. I saw 2-2.5 mpg on a 4 cyl Fox body. I imagine 1-1.5 mpg is p...
by MechRick
Sun Apr 23, 2017 7:54 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300/6 torque boost Advice??
Replies: 3
Views: 930

Re: 300/6 torque boost Advice??

^^^^^^^
And set it up so you have boost below the torque peak of the same engine N/A.

With a blower this would be easy, with a turbo, it would have to be carefully sized.
by MechRick
Sat Apr 22, 2017 5:44 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Mysterious clear tube between intake ducts
Replies: 7
Views: 1670

Re: Mysterious clear tube between intake ducts

My guess is water injection or they ran it on propane. You can see marks where tubing was resting on the inlet tubes.
by MechRick
Wed Apr 12, 2017 4:44 pm
Forum: 240-300 "Big Block" Six Performance
Topic: EFI intake manifolds
Replies: 9
Views: 2278

Re: EFI intake manifolds

I guess I have some drilling and tapping to do. I moved mine to the upper lid of the airbox. Megasquirt doesn't like them in the intake. When I switched back to the stock ECU, it didn't seem to mind. The Van engines have clearance issues that the truck engines don't have I recently switched from th...
by MechRick
Wed Apr 12, 2017 1:57 pm
Forum: Turbo, Supercharger, and Nitrous
Topic: Bench racing Heavy Hauler
Replies: 16
Views: 3313

Re: Bench racing Heavy Hauler

WHAT ARE YOU USING THIS TRUCK FOR? A CAMPER? Yes. I would tow a car on a trailer all day with my half ton. I want to be able to fill the fresh water tank in my 5,500 trailer, load it full of gear and head for the mountains. Something I would be hesitant to try now. I remember my Dad's '70 half ton ...
by MechRick
Sun Apr 09, 2017 3:42 pm
Forum: Turbo, Supercharger, and Nitrous
Topic: Bench racing Heavy Hauler
Replies: 16
Views: 3313

Re: Bench racing Heavy Hauler

I had planned for the '94 I have to install a bread truck 3.9L 4BT. Back when they were reasonable. Now you are lucky to find one for less than $3k. There are also emissions issues installing a 4BT in a '94 F150. Or a '94 F250, for that matter. The 4BT was never used in light duty pickups. Only in m...
by MechRick
Thu Apr 06, 2017 3:30 pm
Forum: 240-300 "Big Block" Six Performance
Topic: radio cutting out with new plug wires
Replies: 1
Views: 715

Re: radio cutting out with new plug wires

Any quality wire that provides 2000-4000 ohms per foot of lead should get the job done. Increasing the resistance lowers the current of the ignition system. That reduces the inductive noise, which helps radio and computer electronics.
Incidentally, it's also the reason we have suppressor spark plugs.
by MechRick
Tue Apr 04, 2017 11:55 pm
Forum: Turbo, Supercharger, and Nitrous
Topic: Bench racing Heavy Hauler
Replies: 16
Views: 3313

Re: Bench racing Heavy Hauler

install hard exhaust valve seat inserts and use Stellite exhaust valves. I understand the advantage of hardened seats, but that puts me at the mercy of the machine shop. I'd rather burn a valve than drop one. Before I would commit to cutting for inserts, I would have to trust the machinist. Well. A...
by MechRick
Tue Apr 04, 2017 4:12 pm
Forum: Turbo, Supercharger, and Nitrous
Topic: Bench racing Heavy Hauler
Replies: 16
Views: 3313

Re: Bench racing Heavy Hauler

I would upgrade the brake system to big disks Discs in the front for sure. I would settle for a Sterling with slide off drums in the rear. From what I'm reading, I would need an F250 camper special to get the big king pins in the front (2wd). Wondering if I could port and install a pedestal carb he...
by MechRick
Sun Apr 02, 2017 12:46 pm
Forum: 240-300 "Big Block" Six Performance
Topic: K b pistons
Replies: 18
Views: 3808

Re: K b pistons

. So autotec is my next step a 352 piston I would have to bore it 0.050 over You are thinking of 390 pistons. 352 FE has a 4" bore just like the 300. I almost built one with 352 pistons once. Those are heavy, beefy slugs. The tops of the pistons have to be cut down to get to zero deck, but the...
by MechRick
Fri Mar 31, 2017 4:10 pm
Forum: Turbo, Supercharger, and Nitrous
Topic: Bench racing Heavy Hauler
Replies: 16
Views: 3313

Bench racing Heavy Hauler

I've been thinking about selling my F150 in favor of an older IDI for years now. Problem is, most of those old trucks are beat to death, or on the edge of cavitation. I want the same level of reliability I enjoy with my 4.9. There is always a Cummins swap, but that means cubic $$$. I've been thinkin...
by MechRick
Wed Mar 29, 2017 7:50 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Pushrod rust?
Replies: 5
Views: 918

Re: Pushrod rust?

Now that you mention it, is that a coolant trail down to the lifter bores?
by MechRick
Wed Mar 29, 2017 3:14 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Pushrod rust?
Replies: 5
Views: 918

Re: Pushrod rust?

Rust on pushrods wouldn't concern me. The functional part of a pushrod is just the ends.

Rust on valve springs is a concern. Usually results in a broken spring. Used to see this often on motorhomes.
by MechRick
Tue Mar 21, 2017 8:37 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Triple Webers
Replies: 8
Views: 2219

Re: Triple Webers

That's kind of how Triumph does it for PCV on the TR6. You will essentially build a vacuum manifold out of equal length tubing connecting the three carbs.
by MechRick
Sat Mar 18, 2017 8:19 pm
Forum: Turbo, Supercharger, and Nitrous
Topic: 1994 Microsquirt/turbo
Replies: 13
Views: 3478

Re: 1994 Microsquirt/turbo

I've run Ford throttle body injectors in MPI fuel rails. Right now I have Denso units in my Bronco II out of a Dodge. Used to be that Probe turbos were a good source of high impedance 24 pph Bosch injectors. I still have some laying around but I wouldn't trust them because of their age. I like to bu...
by MechRick
Sat Mar 18, 2017 8:02 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Towing capacity
Replies: 10
Views: 3185

Re: Towing capacity

Also, does the 1980 swiss cheese frame affect tow ratings?
by MechRick
Sat Mar 18, 2017 7:56 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Towing capacity
Replies: 10
Views: 3185

Re: Towing capacity

Beside the legal concerns of towing over the door sticker, there are two considerations to ponder when looking at the ratings above. What the chassis can handle, and reliability. The king of the 80-96 half-tons seems to be the regular cab long bed 2wd equipped with the 5.8L/E4OD, 3.55 and towing pac...
by MechRick
Tue Mar 14, 2017 2:43 pm
Forum: Turbo, Supercharger, and Nitrous
Topic: 1994 Microsquirt/turbo
Replies: 13
Views: 3478

Re: 1994 Microsquirt/turbo

19 pph will not be enough injector. Use a flow rate calculator. I like this one:

https://www.rceng.com/technical.aspx

8-10 psi will be good for more than 225 HP, requiring at least 24 pph squirters. I would run at least 40's.
by MechRick
Fri Mar 03, 2017 12:46 am
Forum: 240-300 "Big Block" Six Performance
Topic: Swapping C6 to M5OD, axle gears?
Replies: 6
Views: 1773

Re: Swapping C6 to M5OD, axle gears?

The tallest (stock) gear offered with the M5OD was 3.55. That's what I run in mine, and the only time I wish for more gear is when I'm towing. Your van won't get through the air as well as a pickup, so my opinion is something between 3.25 and 3.73.
by MechRick
Fri Mar 03, 2017 12:35 am
Forum: 240-300 "Big Block" Six Performance
Topic: Looking into my options
Replies: 9
Views: 1760

Re: Looking into my options

I pull a 5,200 travel trailer with mine. I find wind resistance to be my biggest issue, but can usually maintain 55-60 mph. Climbs 5-6% grades at 45 mph. Plan on spending time in the truck lanes in the mountains, but you should be fine.
by MechRick
Thu Feb 09, 2017 7:42 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 Mechanical injection
Replies: 10
Views: 2297

Re: 300 Mechanical injection

How about throttle bodies from an EFI 460?

http://www.460ford.com/forum/37-engine- ... -body.html

52 mm is ~2.04"
by MechRick
Thu Feb 09, 2017 4:04 pm
Forum: 240-300 "Big Block" Six Performance
Topic: MPG question
Replies: 30
Views: 5122

Re: MPG question

MechRick, I do not want to in any way sound argumentative, as I just enjoy my truck This board is much too mature for that. Arguments are few and quickly quenched by the moderators. Please let me know if I step over the line with my comments. I am just old enough to remember the Chrysler lean burn ...

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