How much does a 3" pipe flow?

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Feb 28, 2003 | 01:27 PM

Fenris Ulf

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From: Objects in mirror no longer matter.

Re: How much does a 3" pipe flow?

Flow at what? Are you trying to compare muffler flow to straight pipe flow?

Feb 28, 2003 | 01:29 PM

Phil99vette

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From: Port Tobacco, MD

Re: How much does a 3" pipe flow?

I am trying to figure out what size exhaust pipes I need for my new setup. Using the standard calculation of horsepower x 2.2 = scfm, leads me to believe that the pipes need to flow 1200cfm.
Phillip

Feb 28, 2003 | 01:37 PM

Fenris Ulf

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Re: How much does a 3" pipe flow?

How much power are you going to be making? Dual 3" will flow more than enough, but dual 2.5" or a single 3" will suffice for most heads cam cars.

Feb 28, 2003 | 01:41 PM

Phil99vette

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From: Port Tobacco, MD

Re: How much does a 3" pipe flow?

Last time I dynoed the car it made 431/401, swapped out cams, changed a few things so I think it should be 440-460rwhp now. On the bottle add 125rwhp to that so close to 600rwhp on nitrous. Is 2 - 2.5" pipes sufficient for a 440rwhp H & C car? Everyone I am talking to outside of the ls1 market is saying I need a dual 3" for that horsepower vs cid.
Phillip

Feb 28, 2003 | 01:56 PM

Fenris Ulf

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Re: How much does a 3" pipe flow?

<blockquote>quote:<hr />Originally posted by phil97svt:
 Last time I dynoed the car it made 431/401, swapped out cams, changed a few things so I think it should be 440-460rwhp now. On the bottle add 125rwhp to that so close to 600rwhp on nitrous. Is 2 - 2.5" pipes sufficient for a 440rwhp H & C car? Everyone I am talking to outside of the ls1 market is saying I need a dual 3" for that horsepower vs cid.
Phillip <hr /></blockquote>460 might be a little lofty for a cam swap, but going to dual 3" couldn't hurt. Especially on the gas...

Feb 28, 2003 | 02:15 PM

Phil99vette

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From: Port Tobacco, MD

Re: How much does a 3" pipe flow?

<blockquote>quote:<hr />Originally posted by Fenris Ulf:
 <blockquote>quote:<hr />Originally posted by phil97svt:
 Phillip <hr /></blockquote>460 might be a little lofty for a cam swap, but going to dual 3" couldn't hurt. Especially on the gas... <hr /></blockquote>I agree, but who said I only changed the Cam? <img border="0" alt="[evil]" title="" src="graemlins/gr_devil.gif" />
Phillip
Changes***
-Changed 230/230 114lsa cam to a 110lsa cam
-added 3 degrees of timing
-richened the car up from 13.9 to 12.9
-Changed to Foam filter and new intake system(vararam) with radiused inlet
-Removed mangaflow 2.5" X pipe and went to 3" Dr. Gas right after headers help scavenging
-balanced clutch to remove nasty vibration
-ported TB

Feb 28, 2003 | 02:37 PM

TreeGreenZ

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From: NOVA

Re: How much does a 3" pipe flow?

I am wondering the same thing for my car. I think I am going to go with 2 2 3/4 pipes into 3.....I am just doing a heads/cam...solid roller though.

Phil did you ever go to MIR....I was wondering how that track is.

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Feb 28, 2003 | 03:35 PM

Fenris Ulf

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From: Objects in mirror no longer matter.

Re: How much does a 3" pipe flow?

<blockquote>quote:<hr />Originally posted by phil97svt:
 <blockquote>quote:<hr />Originally posted by Fenris Ulf:
 <blockquote>quote:<hr />Originally posted by phil97svt:
 Phillip <hr /></blockquote>460 might be a little lofty for a cam swap, but going to dual 3" couldn't hurt. Especially on the gas... <hr /></blockquote>I agree, but who said I only changed the Cam? <img border="0" alt="[evil]" title="" src="graemlins/gr_devil.gif" />
Phillip
Changes***
-Changed 230/230 114lsa cam to a 110lsa cam
-added 3 degrees of timing
-richened the car up from 13.9 to 12.9
-Changed to Foam filter and new intake system(vararam) with radiused inlet
-Removed mangaflow 2.5" X pipe and went to 3" Dr. Gas right after headers help scavenging
-balanced clutch to remove nasty vibration
-ported TB <hr /></blockquote>Time will tell...good luck!