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Author Topic:   exuast
Dirt Full Roller

Total posts: 41
posted April 29, 2003 08:49 PM
Wondering what I should run for exaust, right now I only have about a foot of pipe off the manifolds, no muffler. is this good, with not back pressure? If I run exaust all the way to the back of the car i think i will only have about 2 to 3 inched from the ground to clear, because I have alot of x bracing on the car. wondering what others run?

Dirt Freak

Total posts: 331
posted April 29, 2003 10:49 PM
I dont know whats best, but I run the corvette 2 1/2" center dumps with a short glass pack on them. It seems to flow well and provides enough back pressure. Plus it keeps the noise level down some.

Smith Racing Team

Dirt Full Roller

Total posts: 74
posted April 29, 2003 11:39 PM
according to bresinki they have done a ton of work on exhaust and they have found that you need to run 2 1/4 on small manifolds no shorter then 56 inches if you have the big manifolds you need to run 2 1/2 inch exhaust nothing smaller or shorter you will gain torgue and horsepower DO NOT run short pipes you take a big chance on warping vavles because they cool down to fast

Bachs Racing Engines

[This message has been edited by iowa_dirt_track_girl (edited April 29, 2003).]

Dirt Full Roller

Total posts: 50
posted April 30, 2003 06:11 AM
Also on the exhaust if you end them just outside the car instead of under it, it will help with the noise level inside the car.

Dirt Full Roller

Total posts: 27
posted May 06, 2003 12:18 PM
Should a low restriction muffler be run to give a little back pressure to help torque?

Dirt Freak

Total posts: 276
posted May 06, 2003 05:17 PM
I just removed the muffler and notice a slight improvement. I had run two 2 1/4" pipes into one 2 1/4" pipe and then a glasspack. I reworked the system and now have the two 2 1/4" running into a homemade "Y" and at that point go to a 3" pipe. I took a piece of metal 2 3/4" wide and a foot long and drilled about fifty 1/2" holes in it, twisted it a half turn, and slid it into the end of the system and welded it there. It may or may not have quitened the noise as I hoped it would, but I feel like it helped the motor.

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