Originally posted by TLS-Store@Dec 30 2004, 02:36 PM
It is a fact that less backpressure will give you more power up top. There is more fluid dynamics then physics involved when we are talking about exhaust flow. If you disagree with me, then that is fine but don't come on here and try to tell me I am dead wrong about something you know little about.
Please. I am an idiot, I bow to your superior knowledge and ability. I've only been building and tuning street and competition engines for 25 years, and cut my teeth on four cylinder motorcycle engines. You're right, you should "draw it out" for me. Save your indignance for the ignorant and easily fooled.
No, the 4 - 2 - 1 is an excellent design. 4 - 2 is stupid because you lose the ability to scavenge the other cylinder pair by routing the exhaust gas to directly to atmosphere (which actually INCREASES backpressure because you don't have the energy of all four cylinders pushing against the atmospheric pressure in a single exhaust, just the two connected to the header).
If a dual exhaust has any horsepower advantage don't you think we'd see it in racing? Ummm. NO, there are no 4 - 2 exhausts on racing on 4's, 6's, 8's, 10's, or 12's. They ALL go into a single pipe, even the turbos with more than one hairdryer. Even the domestic guys know you need a crossover pipe to tie all eight cylinders together when using dual mufflers. And the dual thing is entirely cosmetic. It adds weight (the enemy), and does NOTHING to improve performance.
Maybe you should think about what you are saying before you say I know little about exhausts, you don't know me, my experience, or background.
BTW, fluid dynamics is a subset of physics. Try again.