3X2 EFI EXH. Manifolds

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F-250 Restorer
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3X2 EFI EXH. Manifolds

Post #1 by F-250 Restorer » Tue Jun 26, 2018 11:30 pm

I thought it would be fun to take 2 sets of the efi manifolds and make an exh. system that uses 3 of the manifolds that exit into one single pipe, diameter to be determined.

I know this is a learning project with the welding of cast iron, etc., but I love the lack of heat, stability, dependability, longevity, etc. of the efi's. It is only the lacking performance that sends me to headers. Anyways, I though it would be fun to give it a whirl.

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GPGoverMPG
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Re: 3X2 EFI EXH. Manifolds

Post #2 by GPGoverMPG » Wed Jun 27, 2018 7:03 am

I think it's great. Have fun. Wallace racing has a bunch of automotive calculators you might check it out before you start. Weld up header kit are pretty inexpensive and could yield some real gains.
71 F350 4x4 Super Duty 7.3 IDI
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Re: 3X2 EFI EXH. Manifolds

Post #3 by F-250 Restorer » Wed Jun 27, 2018 2:27 pm

Thanks. I checked with another calculator. Max hp would be just over 300hp.

I run a hedman header now, have for 10 years. Using the efi's would be to keep the heat down. But, once I try to cut off one runner of the first efi manifold and weld it shut, I'll better know what I'm getting into. Of course the biggest challenge is/would be, to create the middle manifold.

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GPGoverMPG
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Re: 3X2 EFI EXH. Manifolds

Post #4 by GPGoverMPG » Wed Jun 27, 2018 4:22 pm

I get the heat thing. Just drove home 98* outside and I don't have shifter or 4X4 boots I just say it would almost burn my hand reaching for the shifter engine temp didn't go above 180*. Seems like header wrap or Jet Hot coating would get the same results. I'm running EFI exhaust manifolds and I'm thinking wrap on the manifolds and the 2.25 pipe back to the Y I made into a 3" pipe. The muffler is a service unit from walker 3" straight thru with 3" pipe back to rear bumper sounds cool but still hot as heck.
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Re: 3X2 EFI EXH. Manifolds

Post #5 by Fordman75 » Wed Jun 27, 2018 7:08 pm

Ceramic coating is awesome. It works great. The temps drops can be amazing. But it is spendy! Unless prices have dropped recently. You could buy 2 or 3 sets of headers for what it cost to have one coated with a good coating.

Header wrap likes to destroy headers ( depending on where you live ) .



If you are going to weld cast iron make sure to pre-heat it. Get it nice and hot weld it then you need to control the cool down. You want it to slowly cool down to prevent cracking. But the process will also depend on what method/filler rod you plan to use.
Ted

54 Ford F100/F150 4x4
300, NP435 4spd, NP205 transfercase

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Re: 3X2 EFI EXH. Manifolds

Post #6 by Shorty » Wed Jun 27, 2018 8:52 pm

I needed to weld on my efi exhaust manifold to make a slight change in the angle of the outlet to avoid a frame rail and make the bend on the y pipe easier. The cast that is used for those manifolds is quite clean and nice to weld to. I pre heated it by setting it on my woodstove after I tacked it (it was winter time when I did this, a BBQ works for nice even pre heat in the summer) and welded it with my Lincoln 180 mig with that flux wire/no shiedling gas in short stitches to keep the heat spread out. I didn't worry too much about the cool down, just set it aside and worked on something else for a bit. It has held up for ten years now with lots of hard use.
85 F150 on 78 bronco frame C6 np205 welded dana44 front, trussed posi nine inch rear. EFI exhaust manifolds into one 2 1/2" rolls on 35x12.5x15 Maxxis Trepador.

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GPGoverMPG
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Re: 3X2 EFI EXH. Manifolds

Post #7 by GPGoverMPG » Wed Jun 27, 2018 9:13 pm

Still going to be a lot of under hood heat be made worse adding more joints in the system.
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Re: 3X2 EFI EXH. Manifolds

Post #8 by Fordman75 » Wed Jun 27, 2018 9:40 pm

Heats going to be there unless you do something to keep it in the system. And it's hard to beat ceramic coating for that, even with manifolds.
Ted

54 Ford F100/F150 4x4
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Re: 3X2 EFI EXH. Manifolds

Post #9 by arse_sidewards » Thu Jun 28, 2018 9:11 am

If you want longevity just make some shorty headers of some thick wall 304 stainless. 1.5" or 2" pipe should be a suitable size (and pipe is almost always cheaper than tube).
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66" leafs, extended radius arms, lockers in both ends, nothing special.

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Re: 3X2 EFI EXH. Manifolds

Post #10 by BigBlue94 » Thu Jun 28, 2018 10:13 am

Fordman75 wrote:Ceramic coating is awesome. It works great. The temps drops can be amazing. But it is spendy! Unless prices have dropped recently. You could buy 2 or 3 sets of headers for what it cost to have one coated with a good coating.


I just had a set of Longtubes done for my 300 by Jet-Hot. It was about $500 For their 2000° off road coating, shipped.
1985 Bronco. 300-6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. 300 has a 4bbl and headers.

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Re: 3X2 EFI EXH. Manifolds

Post #11 by Fordman75 » Thu Jun 28, 2018 1:00 pm

BigBlue94 wrote:
I just had a set of Longtubes done for my 300 by Jet-Hot. It was about $500 For their 2000° off road coating, shipped.


The last time I checked it was in the $550-$600 range. So prices are still fairly close.
Ted

54 Ford F100/F150 4x4
300, NP435 4spd, NP205 transfercase

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Re: 3X2 EFI EXH. Manifolds

Post #12 by F-250 Restorer » Thu Jun 28, 2018 7:08 pm

That is a big bite for header coating! I guess I'll wait for the DIY ceramic coating to come out. I remember when you could buy 'pearl' by the bag (which was ground up abalone shell) to add to your automotive paint for that iridescent look. Too bad it's not like that with a ceramic power additive.

If it seems as though it is too much trouble, and it may well be, I might just throw on my shorty headers and be done with it. They should offer quite a reduction in heat since there is about 50% less surface area.

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Re: 3X2 EFI EXH. Manifolds

Post #13 by BigBlue94 » Fri Jun 29, 2018 7:01 pm

F-250 Restorer wrote:That is a big bite for header coating! I guess I'll wait for the DIY ceramic coating to come out. I remember when you could buy 'pearl' by the bag (which was ground up abalone shell) to add to your automotive paint for that iridescent look. Too bad it's not like that with a ceramic power additive.


Ever heard of cerakote? They have a 2000° DIY coating. It has to be heat cured though. Here's a link to the black color

https://www.cerakoteguncoatings.com/finishes/C-102Q/graphite-black/
1985 Bronco. 300-6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. 300 has a 4bbl and headers.

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Re: 3X2 EFI EXH. Manifolds

Post #14 by F-250 Restorer » Fri Jun 29, 2018 11:52 pm

Ever heard of cerakote? They have a 2000° DIY coating. It has to be heat cured though. Here's a link to the black color

https://www.cerakoteguncoatings.com/finishes/C-102Q/graphite-black/[/quote]

Ha, thanks for the link. I had forgotten about them. I think I'll try them for the headers. The shorties should fit right in the oven. I'll have them sand blasted, spray, dry, and pop them in the oven. It seems to have pretty good reviews online. That is assuming I can get it in Cal?

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Re: 3X2 EFI EXH. Manifolds

Post #15 by BigBlue94 » Sat Jun 30, 2018 9:08 am

I don't imagine there being restrictions on that for cali. I had some once, but it burnt in a fire before I could try it out.
1985 Bronco. 300-6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. 300 has a 4bbl and headers.

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