- Jun 30, 2012
Rohan, It would be possible to build a classic racer look alike from any laydown Guzzi and get it to go quick. Our guys get pushrod ES2s and Matchless singles going as quick as most manxs. The OHC f factor only affects the maximum usable revs , so as with Commandos you build the motor to develop torque, and thus pull rather than rev. The magnesium bits help, but on the old days the guys didn't have titanium to replace the steel bits. DOHC motors have a slight advantage in that the cams are independently variable so timings are more easily optimised. Four valves per cylinder usually gives a ten per cent lift in horse power. Twin cylinder bikes have an advantage beca use they have twice as many valves (higher BMEP), however twice as many things to keep reliable. You can still build a fast competitve bike out of a pushrod single. A two valve Jawa speedway engine on dope in a featherbed will beat most manxs.