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  Exhaust.. ?? Bottlenecks...

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Author Topic:   Exhaust.. ?? Bottlenecks...
bgseib
Gearhead

Posts: 109
From: Tyler, TX, USA
Registered: Dec 2001

posted 10-17-2002 10:30 AM     Click Here to See the Profile for bgseib   Click Here to Email bgseib     Edit/Delete Message   Reply w/Quote
OK - I am having my exhaust replaced from the headers back... I am going with aluminized (spelling?), H pipe, and flowmasters (40 series). My question is... The only new collectors I could find are 3" to 2 1/2 at the end.. I am wanting to go with 2 1/4 pipes though. The muffler guy said we will run 2 1/2 to the mufflers than 2 1/4 back to the trumpets... Would this create a bottleneck?? Would it be better to somehow run 2 1/2 the whole way or 2 1/4 the entire way??

I have a '65 with a bored out 289, 4 bbl holley, elect ignition, over cam, and tri y's... In case that helps with the answer.. : )

Thanks,
Brian

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n2oMike
Gearhead

Posts: 2395
From: Spencer, WV
Registered: Jan 2001

posted 10-17-2002 11:14 AM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
Purchase a set of those $99/pair Flowmaster 2.5" mandrel bent tailpipes. Since they're mandrel bent and aren't full of crushed places... they flow great AND look pretty. Did I mention they were inexpensive?!?!

Minor modifications may need to be made if you are using the holes in the rear valance panel for the exhaust. It shouldn't be much of a problem, though.

Good Luck!

------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220

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69 Sportsroof
Gearhead

Posts: 1863
From: Valley, Alabama, USA
Registered: Mar 2002

posted 10-17-2002 02:13 PM     Click Here to See the Profile for 69 Sportsroof   Click Here to Email 69 Sportsroof     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by bgseib:
The muffler guy said we will run 2 1/2 to the mufflers than 2 1/4 back to the trumpets... Would this create a bottleneck?? Would it be better to somehow run 2 1/2 the whole way or 2 1/4 the entire way??

Actually, the way your muffler guys said he would do it is the best way. As the exhaust gasses cool, they dont need as much space but they also slow down. By going to a smaller pipe behind the mufflers you help keep the exhaust gas moving. I believe 'flow velosity' is the proper term.

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Calcat
Journeyman

Posts: 75
From: Los Angeles, CA
Registered: Feb 2002

posted 10-18-2002 02:09 AM     Click Here to See the Profile for Calcat   Click Here to Email Calcat     Edit/Delete Message   Reply w/Quote
Only downside may be a lose of torque due to the reduced backpressure from the 2.5" I'm not understanding why your exhaust man can't simply neck down the straight pipe portion of the collector to 2.25"

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