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Assuming a fresh set of late model (hydraulic cam) valve springs and other wise stock valvetrain, I've seen valve float at 7400-7500 rpms. But with peak power being made at 5200 or so, even 6000 rpms is redundant with a stock engine. The exception being the horrible 2-3 gear ratio drop, so it makes sense to hang on a bit longer in 2nd gear.

HTH,
Bob
 

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BetaCarotene said:
so on the 2.0 im building......the stock valve springs can handle 6500 safely? also there will be a custom cam involved
As soon as the cam profile is changed, or valve sizes are increased (heavier valves) then the rpm limits are changed for a given valve spring pressure. What cam are you going to use? Solid or hydraulic?

Bob
 

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You'll be borderline with stock springs (late model springs are 180 lbs). I'd try to get something with 210 lbs or so. Early springs are not sufficient at all (150 lbs).

Bob
 

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Discussion Starter · #8 ·
RallyBob said:
You'll be borderline with stock springs (late model springs are 180 lbs). I'd try to get something with 210 lbs or so. Early springs are not sufficient at all (150 lbs).

Bob
what kinda of rpms could valve springs with 210lbs take. Im looking for somthing to rev to about 7500rpms
 
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