Quote: Whats the reason for the small bore? Maybe velocity in the intake port but I'm not sure it would be NET GAIN OVER A LARGER BORE BENNIFIT IN relation to more cubes.
Here's what they say:
According to two-time champion Jon Kasse the short rod yields very fast piston action at TDC and minimizes dwell time so the pistons get away from the chambers as quicly as possible. More time spent at TDC in creases the chance that non-homgenized portions of the mixture will ignite on their own and rattle the motor. Smaller bores are advantageous because they reduce the distance the flame front has to travel and the smaller area also offers less opportunity for unwanted secondary flame fronts to develop. The small bore theory must not be taken to the extreme or valve shrouding becomes a larger issue.
