Valve Float
Nov 3, 2010, 06:30 PM
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Valve Float
Has anyone experienced valve float with a 280 sized cam(specifically BC's) and a Ferrea Beehive spring? i have a noticeable loss in power and im wondering if it's starting to float.
Nov 3, 2010, 06:57 PM
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Exactly right binky..If you have springs then you should not experience that in any which way..B.c cams are mild cams the 280 cams they make are not real true 280's like gsc or kelford..The best way to determine if your really getting float and slap it on a dyno and see if the graph dips..
Last edited by EVO IXMR; Nov 3, 2010 at 06:59 PM.
Nov 7, 2010, 11:06 AM
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I have the car apart for the winter so getting it on a dyno is impossible. But yes, RsMike, thats what im talking about. Is the seat pressure high enough for say a GSC S3?
Nov 7, 2010, 11:16 AM
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So, are you reving it higher then stock? What are you reving to? Valve float comes from the valve bouncing on the seat-- You put the higher rated springs in for a reason rt? What are their specs over stock? This isnt your problem is my guess, I am thinking if you have valve bounce you would be at 8500+rpm's and have bent valves by now. What was the last thing you changed before noticing the power loss...the springs? If so how about looking at the cam timing, if you are not spot on, it will move the power band around, so you could notice a loss of power up top or across the power band.
Nov 7, 2010, 12:30 PM
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its past 9500rpms the power drops. from 9500->10,000 the power drops pretty bad. again, i haven't taken it on the dyno to see a curve but butt dyno tells me its dropping.
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Nov 7, 2010, 01:39 PM
#10
assuming you have a turbo and cams and springs for that rpm range a couple of lads here in the uk had cars hitting a brick wall at high revs. changed the inlet manifold for a well respected name 1 i forget which exactly and they opened right up again
