liduno wrote:
What’s the reason for the test?
I don't know if I should even say --- LOL.
I want to build my own pipe this winter.
Also -- My little brain says that pipe builders are "cheating" by using back pressure to hold back the fresh intake charge.
I don't think many of these pipes have a return pulse that is not strong enough to let all of the exhaust out followed by the fresh charge which is then suppose to be shoved back into the cylinder due to that return pulse.
To me that is what is "suppose" to happen.
This can only happen IF there is NO back pressure and ALL of the exhaust is out, followed by some of that fresh intake charge.
To my little brain, if there is back pressure then that means there is back pressure in the crankcase and therefore as the piston goes up it must create that vacuum to over come the back pressure FIRST before any new charge can be sucked into the crankcase. That means you are NOT getting as much fresh charge as you could be getting and that causes power loss.
Am I making any sense ? Or am I just on smoke ?
CO