Valve Spring Shim
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Joined: Sep 2009
Posts: 859
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From: Frozen Tundra, WI
Valve Spring Shim I have Comp 918 springs (.625 max lift recommended) on PRC Stage 1 LS6 heads (stock valves) and a .598/.600 lift cam. Should I be shimming the valve springs?? Coil bind is at 1.1. Should I be adding .045 shims??
Joined: Aug 2007
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From: Turnin' Wrenches Infractions: 005
Ok so you need to plug that into your formula and figure out coil bind, and how far you want to be away from coil bind at max lift, then you will come up with your shim thickness.
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Joined: Aug 2007
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From: Turnin' Wrenches Infractions: 005
Running at say .060 away from coilbind gives maximum valve control at higher rpms. It keeps the valves from bouncing around on the seat and/or floating with aggressive cam lobes.
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On The Tree
Joined: Feb 2009
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I've read that a NASCAR trick is to run the springs very close to coil bind as it leaves less room between coils for oscillation to happen. Basically the spring can't float or lose control because there's no room left for bounce.
