Originally Posted by
snuvet75
Alright guys, enough bashing for the guy lol. Change of subject.
Could someone direct me to a proper page online or explain the kinetics or dynamics of airflow (gasflow maybe??) of the exhaust and manifold? What makes one brand's pipe not recommended for another brand's engine?
And I remember somebody talked about widening the hole inside the pipe to make the car go faster at the expense of making louder noise. Could somebody explain it why? Thanks.
Start out with the link that Roelof posted, it will give you a rough idea. I also posted names of some other people who have written some books.
Worth mentioning is that they use formulas derived from testing, so for what ever engine you might run it might not work perfect even if you use any of their formulas. Everything is fine tuned after to get the desired results, but funny enough, if you have a pipe that works well it can often work on engines that's not exactly the same.
That's one reason why they for instance use the same divergent and convergent cones for pipes with different EFRA number (sometimes), they just fine tune the rest of the pipe to change it a bit.
There is nothing that say that you can't use another brands pipe on your engine, not sure where you got that from.