Re: Let's get the facts straight about straight pi

Posted by RobertN on May 01, 2004 at 13:16:01 from (206.13.125.116):

In Reply to: Let's get the facts straight about straight pipes! posted by Farmallkid on May 01, 2004 at 07:42:08:

Two things that will affect you.

1) Jetting. As you open or restrict the exhaust, you need to jet the carb, as a more open exhaust will run hotter and want a richer mixture. A closed down exhaust will run cooler, and want a leaner mixture. Run it, and watch your plugs; they will tell you what is happening.

2) An more open exhaust adversely affects low end power. Some backpressure is a good thing at low to mid rpm range. A more open exhaust is applicable for more power in the mid to high rpm range.

A longer exhaust will help scavenge the cylinders better(pull the mix through).
I'm guessing you run wide open for pulling. So, you want full power there.

Thaat is the fun of tuning. Change your exhaust, check the plugs, and jet as necessary. Try it. Then adjust the pipe length, each time checking and adjusting either the plugs(hotter or colder) and jetting(rich/lean). Doing this is what makes race tuners for Nascar, dragster, sprint cars, ect some of the really valuable people on the race circuits.

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