i would like to learn about how the port timing on our engines effects torque and top end power. Iv searched around on the net and i really cant find anything that describes the relationships of port timing, port size and air flow. I would like to know enough so one day i could properly port an engine and know what im doing. I know the basic stuff, but nothing really technical about it. I know having a lot of overlap is going to take away torque and add top end if u have enough flow, but what is considered a lot of overlap? i would like to know how to calculate what RPM a port will make peak HP at and so on.

also, if anyone has any resources on intake manifolds on how to tune the plenum size and runner length for a target rpm on a rotary engine, that would be good too.

Thanks.

 

is this to technical for this forum?
bump!

 

Check out Yaw Power's technical articles. He does not publish how he ports his motors but from his articles it will give you a good start. You also might want to pick up an Automotive Math Book, I doubt there will be anything specific to a rotary engine in it but for intake manifold size/shape the math should be simular if not the same.

http://personal.riverusers.com/~yawpower/