Intake pulse tuning

[Propellor]

Came across this article. Makes interesting reading.

http://www.autozine.org/technical_school/engine/Intake_exhaust.html

[JOOLZ]

Interesting article, I use a tuned intake in my XBR 31 cm from valve face to intake trumpet

[Propellor]

Interesting article, I use a tuned intake in my XBR 31 cm from valve face to intake trumpet

What rpm does it chime in?

Another thing I learned recently, is that a velocity stack intake shape, in section, is an ellipse. For some reason I had it in my head it was parabolic. There you go. 

[JOOLZ]

 The runner is designed to work at between 5700-6400, although there is a 4th harmonic at 7300 but I try not to rev it that hard

[guest564]

I tried some different intake lengths on my XBR600 with the HRC cam on a dyno and found that the shortest possible intake worked best. I would rev it to 8k with a lightened flywheel, it would pull higher but the power was tailing off so there wasn't any point.

[CrazyFrog]

Very interesting. Same principle as two stroke tuned pipes really.....