Exhaust Collector Length

Bobby Kbro · #1 (**permalink**) 03-13-2008, 08:15 AM

I have been working on my modified car, getting ready for the race season, and I picked up a set of adjustable exhaust headers and collectors. One of the old timers explained to me that I should mount them together, put them on the car, then draw a crayon line down the length of the collector. He told me to make one or two laps then check the crayon line.
According to the old timer, the crayon line will be discolored or burned at a spot along the collector, and that is where I need to trim the collector to.
I've learned to trust what most of these old timers tell me, but I wanted to check if anyone else has used the crayon test method for determining the length of your collectors.

blue92notch · #2 (**permalink**) 03-17-2008, 05:27 AM

i haven't but i do know that there are some companies that have programs that can help you figure out optimum collector length and stuff like that. specifically you should check out spd and burns stainless

Bobby Kbro · #3 (**permalink**) 03-17-2008, 07:36 AM

Thanks. I'll look them up and let you guys know how it goes.

Fool_Fire · #4 (**permalink**) 03-18-2008, 06:47 AM

Although the article specifically pertains to small block Chevrolet engines, you might want to take a look at this excellent read.

http://www.superchevy.com/technical/...exh/index.html

Bobby Kbro · #5 (**permalink**) 03-18-2008, 07:10 AM

Man, that is perfect. I happened to be working on a Small block Chevy Motor for this project. Plus, Dave Vizard is a personal hero of mine. Great article from a great professional. Thanks.

Fool_Fire · #6 (**permalink**) 03-18-2008, 10:22 AM

You are welcome Bobby. I will be pleased to help with the technical questions on this forum on a daily basis.