Quote:
Originally Posted by Dessertrunner
Harvey what are bike engines doing with valves?
Tony
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This is the cam/valves used in the Ducati 1098’s 550 cylinder that I compared .to the EG33 before.
The EG33 550cc cylinder gets 38.3hp at 5600 , and 38 ft-lbs at 4800.
The Ducati 550cc cylinder gets 58.5hp at 10,000, and 39 ft-lbs at 9500.
____________INLET__________EXHAUST.
TIMING____O/C 11* 58*_____O/C 60* 20*@ 0.002"
DURATION_____253____________260
LOBE CENT_____111.5___________110
LIFT__________11.8____________10.6
VALVE SIZE____41mm____________34mm
You can see that they rely more on the valve size and lift to fill the cylinder, while keeping the duration and timing as low as they can, to provide the strong wide, useably torque curve, while still developing the HP that gives the speed.
Harvey.