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Posted

In my never ending quest for useless factoids and TMI, I'd like to find out the criteria for determining when/why someone would opt for big bore vs small bore chamber exhaust.

Is it strictly based on engine CC or a desired performance characteristic in conjunction with specific mods, or a combo platter of both size/mods to accentuate a particular characteristic?

 

Just been kind of wondering...

 

Thanks, Jay.

Posted

This is going to be a short, incomplete explanation from me, because I am trying to get out of the shop tonight and get a little bit of sleep before I have to be back at work tomorrow.

 

On a design theory level, detemining which pipes you need is a function of the volume of ehaust gas you move and the rate at which you moce it. Besides the obvious difference in stinger diameter, the expansion chamber will also be different between the two types of pipes. In addition to that the flanges on the head pipe can also be different sizes.

 

I am not sure what the popular criteria is for choosing between the two style of pipe. When I make my pipe choices it is based on a mathematical equation and/or results of a simulation. Not too many other people do that, nor do they probably need to. I'll post up the formulae tomorrow as I do not have it in front of me. :geek:

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