understanding the tuned exhaust made easy!
I am no engineere or phisicist by any means. barely smart enough to be a brain surgeon.
parts of the pipe starting at the engine.
head pipe is the part of the pipe that goes from the manifold to the begining of the first cone.
first cone, is the diffuser cone, its where the pipe gets big.
center section is the main big body from one cone to the other.
baffle cone, or the cone that goes from big to small.
stinger pipe is the little pipe that goes from the end cone to the muffler.
the theory of operation of the tuned pipe is pretty neat and simple when you look at it from basic physics or theorys.
the diffuser cone creates a low pressure system in the pipe, it helps draw the fresh air charge from the crank case up to the combustion chamber. if the exhuast was a straight pipe from that point on you would have a lot of raw gas getting sucked right through the engine and into the exhuast pipe. that is why there is a second cone. it sends a wave back to the engine to stuff the compression chamber and stop fresh gas and air in the cylinder. this happens in about 4-5 thousanths of a second.
the angle and length of the cones also come into play where the power curve is.
the center sections length is basically sized based on the rpm, stroke, and bore of the engine. by changing the length of the center pipe you can raise and lower an engines rpms.
the size of the stinger pipe is based on flow requirements as well. it looks like a little piece of straight pipe but make it to small and the pipe cant get rid of the hot gasses fast enough. drag racers use this to make hot pipes for quick hp. they only need to make hp for 5 seconds but they need the pipe hot and hp there from the starting line. if you make the stinger pipe larger you let more air out. it can make for a good radar pipe or mountian climbing pipe where you are on the throttle for long periods of time.
as you change elevation you are changing dynamics in the pipe. that is why some mountain sleds will have an adjustable stinger, as they move up and down elevation they can simply adjust there stinger pipe to maintain proper operating power.
there is basic math rules to all of pipe building that most builders use as a guide line. stinger pipe size for example is usually .58-.62 the size of the head pipe.
pipe builders use basics to get a good starting point. experience and time on a dyno or computer simulators fine tune a pipe to be the best it can for what the maker wants.
If the boner police are here I need a lawyer.
in a time of deciet telling the truth is a revolutionary act. george orwell.
aint no body ripin like me. M to the a-d-c-o-w. rock it hard for my fly ladies. I rock it yes in deed
. homies still roll with me. money dont change me
nothing goes like 3 holes.
high performance engineering