Performance manifold idea?
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Performance manifold idea?
I have been thinking the last couple days and I wonder if there is much power that can be gained by upgrading the stock intake manifold. I was looking at how the powerstrokes manifold is and I dont think it would be too difficult to fab up something like that for our engines with some time and welding skills. How those intakes work is after the turbo there is a y pipe that splits the air into two pipes that run just above the intake ports and then are connected to the ports. I think that this is a good idea but my only question is how much of a restriction is the stock one? Would it be worth my time to try? If I can even gain 10 or 12 HP out of it I would consider it a success.
Post Fiend
Joined: Oct 2007
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From: Faibanks Ak.
I may be off base here, but we can already with a turbo get more air than the headbolts can handle. You can stud it but you are still limited to the air charge amount they will stand so I'm not sure you would get the desired performance you want. That said nearly anything can be improved on so I'm sure the intake could be improved.
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
Don't forget there are coolant passages in the heads that the valley pan and intake block off.
Once you go above about 21 PSI, boost pressure has a way of making it from the intake runners into the coolant passages.
Studs, gasket maker and higher torque values cured that problem for me so far.
But if you look at how the intake bolts are angled, down instead of toward the heads, I think you may be opening up a different can of worms.
You also have to make provisions for mounting the throttle cable, so the center of the valley is still going to have some bracketry in it for the throttle cable and turbo mount.
Pay a bit of attention to the intake and head ports, do a bit of port matching.
With pressure in the intake, you will gain less than you think with a Stroke style intake.
Once you go above about 21 PSI, boost pressure has a way of making it from the intake runners into the coolant passages.
Studs, gasket maker and higher torque values cured that problem for me so far.
But if you look at how the intake bolts are angled, down instead of toward the heads, I think you may be opening up a different can of worms.
You also have to make provisions for mounting the throttle cable, so the center of the valley is still going to have some bracketry in it for the throttle cable and turbo mount.
Pay a bit of attention to the intake and head ports, do a bit of port matching.
With pressure in the intake, you will gain less than you think with a Stroke style intake.
Posting Guru
Joined: Apr 2008
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for people wanting to run twins or custom turbo setups its a great idea but for a idi turbo the stock intake is fine, i dont know about adding power or anything but it would sure be better fo a custom turbo you would have more room, and if the compression is low enough i think blowing intake gaskets wouldnt be a problem, i guess i will find out when i bild my motor. only difference is i have decided to build a 7.3, i might regret that later but for noe im building a 7.3 and shooting fir 350+ hp at the crank
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
So are you using sleeves?
I would never waste my money on a 7.3, the cylinder walls are already to thin.
If you bore it to get clean cylinders, you are asking for trouble without sleeves.
And in my opinion, sleeves are like Russian Roulette with 4 shells in a six shooter.
My experience, 6500 dollars, thank god for a warranty.
Three engines in 28,000 miles.
I will never install a 7.3 engine that has been rebuilt in my truck again.
Compression has nothing to do with blowing the intake gasket.
That is a boost thing only.
Remember the 6.9 and most of the 7.3 IDI engines were NA, so no pressure on the intake gasket except the coolant passages it blocks off in the heads.
The stock valley pan/intake gasket can handle about 20 PSI.
I blew mine the first or second time I went over 20.
When I get back from plowing I have a high boost picture to share with you guys you are not going to believe.
I don't have time to upload them now.
I would never waste my money on a 7.3, the cylinder walls are already to thin.
If you bore it to get clean cylinders, you are asking for trouble without sleeves.
And in my opinion, sleeves are like Russian Roulette with 4 shells in a six shooter.
My experience, 6500 dollars, thank god for a warranty.
Three engines in 28,000 miles.
I will never install a 7.3 engine that has been rebuilt in my truck again.
Compression has nothing to do with blowing the intake gasket.
That is a boost thing only.
Remember the 6.9 and most of the 7.3 IDI engines were NA, so no pressure on the intake gasket except the coolant passages it blocks off in the heads.
The stock valley pan/intake gasket can handle about 20 PSI.
I blew mine the first or second time I went over 20.
When I get back from plowing I have a high boost picture to share with you guys you are not going to believe.
I don't have time to upload them now.
Posting Guru
Joined: Apr 2008
Posts: 1,614
Likes: 0
So are you using sleeves?
I would never waste my money on a 7.3, the cylinder walls are already to thin.
If you bore it to get clean cylinders, you are asking for trouble without sleeves.
And in my opinion, sleeves are like Russian Roulette with 4 shells in a six shooter.
My experience, 6500 dollars, thank god for a warranty.
Three engines in 28,000 miles.
I will never install a 7.3 engine that has been rebuilt in my truck again.
Compression has nothing to do with blowing the intake gasket.
That is a boost thing only.
Remember the 6.9 and most of the 7.3 IDI engines were NA, so no pressure on the intake gasket except the coolant passages it blocks off in the heads.
The stock valley pan/intake gasket can handle about 20 PSI.
I blew mine the first or second time I went over 20.
When I get back from plowing I have a high boost picture to share with you guys you are not going to believe.
I don't have time to upload them now.
I would never waste my money on a 7.3, the cylinder walls are already to thin.
If you bore it to get clean cylinders, you are asking for trouble without sleeves.
And in my opinion, sleeves are like Russian Roulette with 4 shells in a six shooter.
My experience, 6500 dollars, thank god for a warranty.
Three engines in 28,000 miles.
I will never install a 7.3 engine that has been rebuilt in my truck again.
Compression has nothing to do with blowing the intake gasket.
That is a boost thing only.
Remember the 6.9 and most of the 7.3 IDI engines were NA, so no pressure on the intake gasket except the coolant passages it blocks off in the heads.
The stock valley pan/intake gasket can handle about 20 PSI.
I blew mine the first or second time I went over 20.
When I get back from plowing I have a high boost picture to share with you guys you are not going to believe.
I don't have time to upload them now.
im not going to slevee it and not going to bore it, but there is a way to sleevee one without risking the sleeves moving i dont have time to post the info but there is a couple people who have done it with no problem, but im not going to sleeve or bore it, im going to lower the compression to 19:1 do away with glow plugs and run high timing and crank it with ether, for turbos its going to be a powerstroke turbo if it wont do good enough i will put a .84 exhuast housing and a high boost intake compressor wheel
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Cargo Master
Joined: Mar 2006
Posts: 2,789
Likes: 5
From: Sand GAp, KY
I also thought about the custom intake thing but worried about he bolting system like dave mentioned. It would be hard to get the clmping force at that angle without the full spread that the factory intake has. Now if you had t he time and know how to possibably drill and tap the heads for a better angle it might work but port and polishing the stock intake would be just as good. It just wouldn't allow for the extra space you guys are talking about. On the other hand the custom exhaust manifolds I am still working up in my head would allow for the placement of turbo or tubos where ever you wanted them.
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Post Fiend
Joined: Oct 2007
Posts: 10,501
Likes: 5
From: Faibanks Ak.
I dont renenber who built it but there was a turbo that was on the side only ran off one manifold I never saw one on a motor just remember reading about them amd I don't belive they lasted long but that concept could have been a dual turbo setup real easy.
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Starmilt I've seen that setup also, can't remember were.
Lead Driver
Joined: Nov 2003
Posts: 6,900
Likes: 3
From: Campbell River, B.C.
Was that the Rayay setup???
If I remember right, it was mounted off a custom manifold on the driver's side, but there still was a cross over pipe from the other side to get exhaust flow from both sides of the engine.
If I remember right, it was mounted off a custom manifold on the driver's side, but there still was a cross over pipe from the other side to get exhaust flow from both sides of the engine.