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Apollo
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Location:
Brisbane, QLD, Australia
Registered:
May 2002

Re: Stupid DOHC question	Tue, 25 November 2003 01:28

I remember posting somewhere once the main advantage of dohc as opposed to sohc with the same amount of valves. Basically the main advantage of more power and higher revving, (dohc loves to rev) belongs to dohc. The reason is due to less friction per 2 cycles (fuel in and exhaust out) in the 4stroke process. I'll just explain this very simply: If you have a sohc design, you have just the one cam pushing all intake and exhaust valves via a common rocker arm. If you have a dohc setup, you have one cam to do the intake, and one cam to do the exhaust. Less frictional energy lost on the dohc = more response and power. Plus you have the other advantes already mentioned with cam angles, etc. [Report message to a moderator]

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