- Joined
- Jul 8, 2011
- Messages
- 2,668
comnoz said:Generally speaking short rods will increase the torque in the lower to middle RPM ranges if you have a small fast burning chamber like a Norton.
A longer rod increases the torque at higher RPM because the ideal rod to crankshaft angle comes a few degrees later so the fuel has more time to burn and raise the cylinder pressure.
The differences are very small. Jim
+1
As stated earlier, for any given engine configuration (rod to stroke ratio) peak torque is at peak volumetric efficiency - the rule applies across the board.