Exhaust Pipe TOO big??
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Postmaster
Joined: Jun 2004
Posts: 2,665
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From: B/CS, Texas!!
Exhaust Pipe TOO big??
Hey guys/gals, right now on my 93 F-150 w/302 I have a rigged up exhaust and need to fix it lol.
It has no cats, and I Y'd the 2.25" downpipes into a Single 3" pipe that runs thru a 3"In/Out Flowmaster. Right now, its dumped right under the cab, so needless to say its loud.
My question is, will it hurt any if I run the 3" pipe all the way back to behind the wheel, and maybe put a 4" Tip on it? (lol)
It has no cats, and I Y'd the 2.25" downpipes into a Single 3" pipe that runs thru a 3"In/Out Flowmaster. Right now, its dumped right under the cab, so needless to say its loud.
My question is, will it hurt any if I run the 3" pipe all the way back to behind the wheel, and maybe put a 4" Tip on it? (lol)
Senior User
Joined: Apr 2005
Posts: 457
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From: Pittsburgh
Might actually be better for the truck since it's not sitting in all those exhaust fumes from the cab back. I wouldn't go with a 4" tip though, that seems a little excessive. Maybe a 3-1/2" but I wouldn't go bigger than that.
Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
Well if we look at it scientifically:
2.25" pipe
1.125 radius
12.5"^2 area at 2.25
25.0"^2 area wanted when pipes are joined from both sides. (12.5*2)
2.5" pipe:
15.4"^2
3" pipe:
22.2"^2
3.5" pipe:
30.2"^2
So 3" pipe would be the closest. If you run it back farther your lungs and your ears will thank you. I'd forget about the tip.
2.25" pipe
1.125 radius
12.5"^2 area at 2.25
25.0"^2 area wanted when pipes are joined from both sides. (12.5*2)
2.5" pipe:
15.4"^2
3" pipe:
22.2"^2
3.5" pipe:
30.2"^2
So 3" pipe would be the closest. If you run it back farther your lungs and your ears will thank you. I'd forget about the tip.
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Post Fiend
Joined: Dec 2003
Posts: 6,658
Likes: 4
From: "Islander"
Reduce above pipe area by 8% to 10% as pipe is measured in OD and exhaust gas is thru the pipe ID. Unless the motor fires cylinders simultaneously from both banks (not going to happen) the double pipe area dosen't apply, this was from Burns Stainless who build all out exhausts from headers to tips, Indy to Formula 1 motors, $2,000 headers up. I think they know exhausts.
On turn downs under the truck you have to be mad at yourself as any long trip you'll want to get away from the truck, do I hear noise fatigue?
.....=o&o>.....
On turn downs under the truck you have to be mad at yourself as any long trip you'll want to get away from the truck, do I hear noise fatigue?
.....=o&o>.....
Last edited by "Beemer Nut"; Mar 29, 2006 at 12:51 AM.
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the5schlueters
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