Difference Between Cams

[rb26s13]

so title states.. will there be much difference in outright power.. response and topend between the two..

setup is

-5 2860r's

sard 800's

powerfc

z32's

3inch dumps

4inch catback

[MR331307]

at 30 psi with my car

i gained 55 hp just by the different cams with no adjustments on the cam gears

This was with a solid lifter RB25

[DVS JEZ]

id say about 10-15kw increase.

[discopotato03]

Because the valves are open further per camshaft degree with the high lift version it would breath better .

In the US they like to plot cam profiles and show duration at 50 thou lift , if you could overlay the two graphs the difference is rather obvious .

The down side is that the valve train becomes noisy because the lift ramps are more agressive . Also because valve accelerations become greater is is more important to use suitable valve springs to control the valves innertia and overcome valve crash or bounce . Also you MUST avoid spring coil bind at ALL costs because otherwise it will destroy itself .

Cheers A .

[rb26s13]

ok ok.. WILL THE HIGHER LIFT CAMS REQUIRE maching to the head to clear the head itself? or will they be allright..

[rev210]

the bigger lift ones need material taken ot to clear.

[rb26s13]

is there anything else needed to run that much lift?

[Eug]

valve springs need replacing no?

[rb26s13]

yes already got that..

[Abo Bob]

Also expect the valve seats to last longer with the lower lift/weaker springs. Long term, the high lift/strong springs pull the valves back into the head slowly.

If you don't think you'll have the car for 50-100,000 k's then don't worry.