Originally Posted by
Speedypeterb
I know people think that engines suck air in but the opposite is true, the engine creates lower pressure when the piston drops inside the motor then what is outside and the air is pushed into the motor
Well, thats right, but its a different way of saying that air is "sucked" into the engine. Semantycs?
Originally Posted by
Speedypeterb
Nitro you deffinetly right about slowing the exhaust down, I was typing before completely thinking which way the pipes conical was,
In a valve type motor the valves close and the fuel is packed in the cylinder, but in these two strokes you need back pressure to help with the air packing of the cylinder
I was sure that the bigger end of the pipe was on the engine side, but before I typed I got up and looked at a header and was surprised.
Perhaps a conical header generates more power(with more fuel consumption) because the header being smaller on the engine side helps scavenge(another word for suck
) the mixture faster before slowing it down in the pipe? Just thinking.