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  '64 1/2 to '73 -- The Classic Mustang
  Small tube pipes vs big

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Author Topic:   Small tube pipes vs big
Gary
Gearhead

Posts: 656
From: Sarasota, Fla. USA
Registered: Jun 99

posted 08-29-2001 11:05 AM     Click Here to See the Profile for Gary   Click Here to Email Gary     Edit/Delete Message   Reply w/Quote
I have been wondering what other effects it would have on a engine using smaller vs big exhaust pipes besides a HP drop? I would think HP would decrease and torque would increase abit. Put it this way, I found a exhaust combo (sidepipes)that have 2-1/4" inlets to large tube mufflers and wondered what if any effect I would have going with this smaller pipe over using 3" pipe.
Overheating problems possible or would I be ok using them?

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TomP
Moderator

Posts: 3540
From: Delta BC Canada
Registered: Dec 99

posted 08-29-2001 12:34 PM     Click Here to See the Profile for TomP   Click Here to Email TomP     Edit/Delete Message   Reply w/Quote
it wouldn't make overheating a problem unless the pipes were tiny.

2 1/4" is fine for any small block and most big blocks. 3" is overkill but won't hurt power.

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bluestreek
Gearhead

Posts: 545
From: Athens,GA
Registered: Jul 2001

posted 08-29-2001 12:38 PM     Click Here to See the Profile for bluestreek   Click Here to Email bluestreek     Edit/Delete Message   Reply w/Quote
It depends on your engine and how restrictive the mufflers are.. I would think that a short 'non-restrictive' 2 1/4" system would work great on a SB engine that is only gonna turn 6200 rpms or so .. It will definitly give more low end torque than a 3"... For more rpms and CU.IN., then you should go bigger... 2 1/2 - 3".

Exhaust overheating is usually due to a lean condition or not enough compression to keep exhaust gases moving..

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