valve float
#1
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i just got dynoed and at around 6500 i had some valve float. i am running harland sharp rockers which im thinking is my problem. would i be better off putting in some stock rockers or trying to shim up the springs in order to fix this? my cam in .623/.623 lift and i have patriot .650 lift springs
thanks
thanks
Last edited by ls1curt; 03-10-2011 at 04:21 PM.
#2
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I think you would be better off putting some stock rockers on the car. We prefer to use stock rockers unless absolutely forced to go aftermarket because of a set of heads. The stock ones seem to be the best out that can keep up with the aggressive heads/cam setups people are using these days.
#5
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Hmmm...are your HS rockers 1.7:1? If so, I'd leave 'em alone & look into pushrods. Further, even if you were to go w/ a heavier spring, if the pushrods are pole vaulting, the issue may not go away. There are a few write ups in here that expalin the effect of pushrod flex. A thicker walled pushrod may be the answer if pole vaulting push rods are the source of the valve float (idea being that a vaulting push rod applies a higher inertial load to the spring than a push rod that does not flex & then spring into the rocker).
#7
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We have consistantly seen aftermarket rocker sets like these have valve float because they are heavy. If you want to do anything to the rockers put a set of stock ones on with the comp trunion kit like vengeance said, best way to go for a problem free valvetrain on a setup like this.
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#11
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I am running H/S Rockers and have always been! I now have a smaller cam as in my sig, i had been running Patriot Gold due to originally running a TSP 231/237 cam which revved freely to 7k.
On changing to the smaller cam which was meant to rev to 6700, but it wouldn't go past 6200. I replaced springs with a new set of Patriots, still wouldn't go past 6200,
A year later after a broken timing chain & adding a 102 Fast intake & 102 TB it wouldn't rev past 5500!!!!!!
We tried a set of standed LS2 springs & what do you know, the valve float kinda issue was solved.
I fitted a set of PAC 1518s and now the engine revs to 6700 no worries.
I personally don't believe it's the H/S Rockers
On changing to the smaller cam which was meant to rev to 6700, but it wouldn't go past 6200. I replaced springs with a new set of Patriots, still wouldn't go past 6200,
A year later after a broken timing chain & adding a 102 Fast intake & 102 TB it wouldn't rev past 5500!!!!!!
We tried a set of standed LS2 springs & what do you know, the valve float kinda issue was solved.
I fitted a set of PAC 1518s and now the engine revs to 6700 no worries.
I personally don't believe it's the H/S Rockers