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Old 12-03-2002, 08:49 PM
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i was told the secret to higher RPM is in the valve springs, any opnions on this idea would be helpful, but on this idea what would the effect be if you put to strong of a valve spring on a cam? and if ya wanted to only boost the RPM max alittle would it be able to do it? say like 5400 to about 6100

any thoughts on this would be helpful
thx Camaro76

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Old 12-03-2002, 08:51 PM
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Any stock hydraulic cam with properly operating lifters and fresh springs should turn that RPM no problem.

It is possible the engine is just running out of cam if your engine goes flat at that RPM. Springs will not help that.

Too strong a spring on a hydraulic cam will bottom out the lifters and possibly damage the cam.

[ December 03, 2002: Message edited by: Infomaniac ]</p>
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Old 12-03-2002, 08:59 PM
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i ask more for preventing valve float, acording to the cam spec sheet that cam with the cam/lifter set valve float happons at 5400
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Old 12-03-2002, 09:02 PM
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[quote]Originally posted by Camaro76:
<strong>i ask more for preventing valve float, acording to the cam spec sheet that cam with the cam/lifter set valve float happons at 5400</strong><hr></blockquote>

That could be due to the shape of the cam lobe. Cam grind. An agressive opening and closing speed will float regardless of spring tension.

You can try springs. If it does not work you already have good springs for a new cam.
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Old 12-03-2002, 09:12 PM
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Zerp lashing is required on most hydraulic setups due to lifter pump, that will get you to 6200 rpm or so.
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Old 12-03-2002, 09:21 PM
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when you set up a hydraulic cam valve spring you want not more than about 120 lbs on the seat, any more and you will wipe the lobe very easily, if you "0" lash the lifters and use high rev lifters you can get the 6000 plus rpm, if the cam is ground for that range. watch out for coil bind at full lift and make sure the retainer and locks don't hit the seal and guide.
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