Exhaust Question
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Senior User
Joined: Jan 2004
Posts: 180
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From: Mobile, AL
Exhaust Question
Hey guy's,
I'm building an exhaust for my truck using Ram horns and a set of glass packs that exit in front of the rear tires.
My question is what size pipe should I use for my 292 with holley 4 barrel?
There is another factor involved. I want to eventually put a built 351w in the truck and not have to redue the whole exhaust. So I would like the pipes to be a good size for that motor as well to save me a little money when I do the swap. I plan on making 350-375 hp with the 351.
I'm thinking 2.25 would be a good size for both motor's. What do you guys think?
Thanks,
Mike
I'm building an exhaust for my truck using Ram horns and a set of glass packs that exit in front of the rear tires.
My question is what size pipe should I use for my 292 with holley 4 barrel?
There is another factor involved. I want to eventually put a built 351w in the truck and not have to redue the whole exhaust. So I would like the pipes to be a good size for that motor as well to save me a little money when I do the swap. I plan on making 350-375 hp with the 351.
I'm thinking 2.25 would be a good size for both motor's. What do you guys think?
Thanks,
Mike
Lead Driver
Joined: Aug 2003
Posts: 6,305
Likes: 18
From: Boulder Creek, Ca
Have a 302 with 4bbl and used the 2.50. Posted simular question in another FTE forum and majority agreed with Kens64 and Vernon. Have the flareside (stepside) exhausting front of rear tire under the step. The only issue may want to consider is muffler selection. With the exhaust just rear of the cab too loud of mufflers can be anoying, at least i found this to be the case. The glass packs should be okay. If considering doing yourself, i have a 65 F100 with headers and found the 'offset extention', if recall made by Hedman, very helpful in dealing with crossmembers.
dave
dave
New User
Joined: Aug 2006
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From: Brookings,Oregon
If you Want sound and better gas miles id say ya go dual exhust with glass packs but if you want stock stay dubd single exhast you get better compression. But i have a question i have a 1966 250 and i just got it and it came with dual exhust coming out in front of the rear tires do i leave it or change it?
Last edited by Preacher Joe; Aug 27, 2006 at 09:57 PM.
Posting Guru
Joined: Nov 2004
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From: Turlock CA
You guys raise a question.
I have 3" Stainless from the headers back about 4 feet that drop into a Y pipe into a single 3" stainless muffler than over the rear axel out behind the right rear tire. It sounds great and runs well 352 4v.
The question is how do you know if you don't have enough back pressure?
Or how do you check for back pressure?
How much back pressure should you have?
I have 3" Stainless from the headers back about 4 feet that drop into a Y pipe into a single 3" stainless muffler than over the rear axel out behind the right rear tire. It sounds great and runs well 352 4v.
The question is how do you know if you don't have enough back pressure?
Or how do you check for back pressure?
How much back pressure should you have?
Logistics Pro
Joined: Dec 2004
Posts: 4,651
Likes: 60
From: Hemet ca.
I have a 292 with the ford-o-matic trans after checking around most people said to go with a 2.50 exhaust however after I was given two flowmaters with three in and three out, I went with the 3.00 inch from front all the way out the rear see my gallery for pic's. I'm not a racer so the sound of flowmasters sounds great and looks great. I put an awsome set of tips that makes it look real koool from behind. But the question being raised about back preasure and how much you should have is a good one. How much and how do you tell what's right for your application?Staing low for now
Robert
Robert
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Posting Guru
Joined: Jun 2002
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From: Rio Rancho USA
"The question is how do you know if you don't have enough back pressure?"
You want as little as possible. You cant get rid of it completely though because even a straight pipe system will have some due to the bends in the pipe. Backpressure=restriction. Velocity=good exhaust scavenging=power.
"Or how do you check for back pressure?"
Welding in an 02 sensor bung and screwing in a pressure gauge and plumbing it into the cab can tell you what you have.
"How much back pressure should you have?"
See question 1.
You want as little as possible. You cant get rid of it completely though because even a straight pipe system will have some due to the bends in the pipe. Backpressure=restriction. Velocity=good exhaust scavenging=power.
"Or how do you check for back pressure?"
Welding in an 02 sensor bung and screwing in a pressure gauge and plumbing it into the cab can tell you what you have.
"How much back pressure should you have?"
See question 1.
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Brett Foote
Posting Guru
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From: Rio Rancho USA
Originally Posted by Preacher Joe
If you Want sound and better gas miles id say ya go dual exhust with glass packs but if you want stock stay dubd single exhast you get better compression. But i have a question i have a 1966 250 and i just got it and it came with dual exhust coming out in front of the rear tires do i leave it or change it?
Neither has anything to do with better compression. Bore, combustion chamber size cam profile and some other things determine that.
Whether you keep what you have or not depends on opinion. In my opinion I would extend it out to under the bumper. The longer the total pipe length is, the more mellow the exhaust will sound.
Cargo Master
Joined: Jul 2006
Posts: 3,014
Likes: 91
From: Concord, CA
Originally Posted by gangstakr
I have a 292 with the ford-o-matic trans after checking around most people said to go with a 2.50 exhaust however after I was given two flowmaters with three in and three out, I went with the 3.00 inch from front all the way out the rear see my gallery for pic's. I'm not a racer so the sound of flowmasters sounds great and looks great. I put an awsome set of tips that makes it look real koool from behind. But the question being raised about back preasure and how much you should have is a good one. How much and how do you tell what's right for your application?Staing low for now
Robert
Robert
Oh, and pipes out in front of the rear tires. Not on my truck and that is the first thing that went along with the glasspaks.
New User
Joined: Aug 2006
Posts: 12
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From: Brookings,Oregon
you mean it has a lower growl sound when the longer the pipes are? LONGER PIPES=LOWER SHORT=HIGHER GROWL ?
Originally Posted by kens64
Dual vs single- it doesnt really matter. If both are designed right, one will offer no benifits over the other, except the single system could weigh less and probably be cheaper. There are WAY better choices than glasspacks if you want good exhaust flow. I admit they do sound good though if done right.
Neither has anything to do with better compression. Bore, combustion chamber size cam profile and some other things determine that.
Whether you keep what you have or not depends on opinion. In my opinion I would extend it out to under the bumper. The longer the total pipe length is, the more mellow the exhaust will sound.
Neither has anything to do with better compression. Bore, combustion chamber size cam profile and some other things determine that.
Whether you keep what you have or not depends on opinion. In my opinion I would extend it out to under the bumper. The longer the total pipe length is, the more mellow the exhaust will sound.
Senior User
Joined: Nov 2005
Posts: 199
Likes: 0
Originally Posted by Preacher Joe
you mean it has a lower growl sound when the longer the pipes are? LONGER PIPES=LOWER SHORT=HIGHER GROWL ?
I then finished off the exhaust and made it go all the way back over the rear axle and the kicked out the side behind the rear wheel. It sounds alot deeper, it doesent sound as sharp. and it is also quieter than the shorter exhaust.
so yes it has a lower growl with longer exhaust , it is also a little more quieter (very bad gammer)
New User
Joined: Aug 2006
Posts: 12
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From: Brookings,Oregon
O.K. thanks i thout that I should take it out the back and its dual it comes out the both sides in front of the rear tires and should i put turbo mufflers or just normal mufflers but i don't want to get rid of dual exhust.
Originally Posted by Young_unn
I had straight exhasut that came out behind the cab, with almost no bends from the headers and it was very load and seemed very sharp. and i would liek to say it almost sounded liek it was cracking.
I then finished off the exhaust and made it go all the way back over the rear axle and the kicked out the side behind the rear wheel. It sounds alot deeper, it doesent sound as sharp. and it is also quieter than the shorter exhaust.
so yes it has a lower growl with longer exhaust , it is also a little more quieter (very bad gammer)
I then finished off the exhaust and made it go all the way back over the rear axle and the kicked out the side behind the rear wheel. It sounds alot deeper, it doesent sound as sharp. and it is also quieter than the shorter exhaust.
so yes it has a lower growl with longer exhaust , it is also a little more quieter (very bad gammer)
Senior User
Joined: Nov 2005
Posts: 199
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Originally Posted by Preacher Joe
O.K. thanks i thout that I should take it out the back and its dual it comes out the both sides in front of the rear tires and should i put turbo mufflers or just normal mufflers but i don't want to get rid of dual exhust.
Post Fiend
Joined: Nov 2000
Posts: 6,060
Likes: 7
From: Glendale Arizona
If you want to swap out a differing engine combo use Heddder flanges as couplings near the transmission. this will allow you to only have to fabricate a short section of exhaust to meet the new conditions of a non Y block motor. Seeing as a small block chevy is the only other user of rams horns........
GArbz
GArbz