Valve springs question

BlackVert · Sep 12, 2006

Is the rating an indication of how much pressure the springs exert on the valves to keep the valves from floating at high rpms?

If my valve springs are rated for up to .500" lift, can I "get away" with a cam that lifts the valves to .512" and .533" if I keep the rpm below 5000?

I never rev my engine past 5000 rpm anyway.

yellow1995Cobra · Sep 12, 2006

is this a serious question?

BlackVert · Sep 12, 2006

actually, it was ... which shows how little i know about that part of the engine.

but i am realizing that it is more than just a question of valve float. it also has to do with the thickness of the spring when the valve is fully compressed and if the lift is too far, then the springs hit bottom and things can and probably will break.

yellow1995Cobra · Sep 12, 2006

That part of the question i can see. But the part about never revving above 5k kills me. I mean comon?

Anyways, my one tip in the car game, just the spend the few extra bucks and do it right. Dont cheap out on springs, crappy heads, crappy pistons, and so on.

BlackVert · Sep 12, 2006

yeah, i don't rev past 5000 ... i guess i'm an old fuddy-duddy

mo_dingo · Sep 12, 2006

On a stock h/c/i car you shouldn't rev past 5k anyway, lose power. Better to shift at 5k.

but seriously, get the correct valve springs. Because everyone knows how easy it is to accidently rev the motor out by missing the brake pedal, or missing a shift.
Scott

yellow1995Cobra · Sep 13, 2006

mo_dingo said:
On a stock h/c/i car you shouldn't rev past 5k anyway, lose power. Better to shift at 5k.

but seriously, get the correct valve springs. Because everyone knows how easy it is to accidently rev the motor out by missing the brake pedal, or missing a shift.
Scott

His car isnt stock.

scarless · Sep 18, 2006

BlackVert said:
If my valve springs are rated for up to .500" lift, can I "get away" with a cam that lifts the valves to .512" and .533".

The answer is NO. If a cam has a .512 lift and your springs have a bind height of .500, then you are going to bend pushrods and break things.

Therian · Sep 18, 2006

why do you want a cam with that high of lift if you want to make maximum power at 5000rpm? (or lower)

scarless · Sep 18, 2006

I don't consider .512 to .533 to be a high lift cam. The faster the valve gets to its max flow lift the more power he will make.

Valve springs question

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