antno Posted December 15, 2011 Share Posted December 15, 2011 at what horsepower or revs would you think about needing a kevlar belt? is it just to do with revving the engine or higher valve spring pressures or just big power forcing the piston down? cheers antno Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted December 15, 2011 Share Posted December 15, 2011 I would say that unless your running silly cams, std belt is fine for most application's, the highest forces are actually at work on the valve gear, including the belt at idle/low RPM. Link to comment Share on other sites More sharing options...
Digsy Posted December 17, 2011 Share Posted December 17, 2011 The strength of the cam belt isn't directly linked to the engine power and certainly has nothing to do with the cylinder pressures. Its all todo with the cam profile. As a rule of thumb, if you start with stock cams and increase the cam duration but keep the lift the same then the loads on the belt will decrease. If you keep the duration the same but increase the lift then the belt loads will increase. What is most likely is that an aftermarket cam will have an increased duration and lift which will (hopefully) be designed to keep the belt loads roughly the same as stock, or be slightly less. If you significantly increase the maximum engine revs then you might find you need stiffer springs to keep the valves under control, and that would increase the belt loads regardless of cam profile. Link to comment Share on other sites More sharing options...
antno Posted December 17, 2011 Author Share Posted December 17, 2011 Cheers I understand now Link to comment Share on other sites More sharing options...
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