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Author Topic:   Mandrel Bent Exhaust ?
grandestang
Gearhead

Posts: 170
From: Lake Bluff, Illinois USA
Registered: Jan 2003

posted 03-05-2003 01:45 PM     Click Here to See the Profile for grandestang   Click Here to Email grandestang     Edit/Delete Message   Reply w/Quote
Are mandrel bent pipes really worth it? I mean does a little bottleneck really restrict flow that much? I have asked a couple mechanics and exhuast guys and they do not think it really makes that much of a difference at all, especially if your pipes are bent by someone competent. I know alot of you guys run open headers on your race cars and could care less about exhaust, but for my (soon to be) healthy 351W I really dont think mandrel bending will really make that much of a flow diffrence. Maybe over the rear axel, but i dont know. Any opinions?

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1970 Grande
H code 351W FMX

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Moneymaker
Administrator

Posts: 19704
From: Lyons, IL, USA
Registered: May 99

posted 03-05-2003 02:39 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Has Howie's career gone down the tubes so much that he is now doing mufflers and tail pipes?

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Alex Denysenko
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n2oMike
Gearhead

Posts: 1547
From: Spencer, WV
Registered: Jan 2001

posted 03-05-2003 03:25 PM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
Well, the people you have asked are the ones using pressure benders to make exhaust systems.

For performance (especially a hot 351W based engine) mandrel bending is very important. If you can't afford anything else, at least get a set of the $99 Flowmaster mandrel bent tailpipes. (if you run tailpipes) The tighter the bend, the more it gets crushed... and tailpipes get bent very sharply. Your local muffler shop should have no problems installing them for you.

Good Luck!

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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
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cobravenom71
Gearhead

Posts: 746
From: Kissimee, Fl USA
Registered: Aug 2002

posted 03-05-2003 04:16 PM     Click Here to See the Profile for cobravenom71   Click Here to Email cobravenom71     Edit/Delete Message   Reply w/Quote
The 'crushed' area in the pipe that is a result of the pipe-benders in most muffler shops will most definately affect performance. Your exhaust does not flow out the tailpipes in one continuous flow. It actually comes out in 'pulses' or 'wavelengths' that all react with one another to help, or hinder the flow. Unnecessary crimped areas will create a disruption of the natural backpressure that forms in the exhaust and cause the exhaust pulses to actually 'fight' each other, restricting flow.

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grandestang
Gearhead

Posts: 170
From: Lake Bluff, Illinois USA
Registered: Jan 2003

posted 03-05-2003 05:26 PM     Click Here to See the Profile for grandestang   Click Here to Email grandestang     Edit/Delete Message   Reply w/Quote
Thanks guys, i just wanted to get a little backround on it before i actually got into it and decided on what i am going with.

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1970 Grande
H code 351W FMX

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