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Author
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Topic: Mandrel Bent Exhaust ?
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grandestang
Gearhead Posts: 170
From: Lake Bluff, Illinois USA
Registered: Jan 2003
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posted 03-05-2003 01:45 PM
   
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?------------------
1970 Grande
H code 351W FMX
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Moneymaker
Administrator Posts: 19704
From: Lyons, IL, USA
Registered: May 99
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posted 03-05-2003 02:39 PM
Has Howie's career gone down the tubes so much that he is now doing mufflers and tail pipes?  ------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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n2oMike
Gearhead Posts: 1547
From: Spencer, WV
Registered: Jan 2001
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posted 03-05-2003 03:25 PM
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! ------------------
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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cobravenom71
Gearhead Posts: 746
From: Kissimee, Fl USA
Registered: Aug 2002
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posted 03-05-2003 04:16 PM
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
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posted 03-05-2003 05:26 PM
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. ------------------
1970 Grande
H code 351W FMX
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