OHC engines are also OHV, BUT! It is more a naming convention than anything else, when you distinguish and engine as OHV it is generally understood to be an engine with pushrod actuated valves vs. the rockerarms riding directly on the cam as in an OHC engine.
Usually an OHV engine will produce a more torque biased power curve than an OHC engine. An OHC engine has less reciprocating mass and thus can reach higher RPM's than an OHV engine can. Horsepower is directly related to RPM, torque is not RPM dependant (although you must have some RPM to have any measure of engine power). Take two similar engines with the only difference being engine redline. The first engine.. just say that it makes 15hp at it's 5000 RPM redline, the second engine, the exact same in everyway except it has a 10000 RPM redline, will make 30hp (double the RPM's=double the HP) but the torque numbers will remain unchanged.
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Originally Posted by chinarider
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Originally Posted by tcs
PS - Did you know?: OHV Chevrolet Corvette racers have beat DOHC Porsches and Ferraris at the famous 24 Hours of Le Mans 6 of the last 8 years.
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Thanks, TCS.
That was actually a very well done response. Are all OHV pushrod? I would guess so but maybe there is different?
Also in the case of the OHC and OHV versions of the Lifan engine, the OHC has 1 more HP, is this correct, or have I been mislead. And finally is it true that a non-pushrod style engine will normally rev higher then the pushrod version? |