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#1
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roller rocker side clearance
my roller rocker set came with springs for spacers.I am making alum. spacers instead. How much side clearance should I have?
thanks, Jeff 340 cuda |
#2
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I wouldn't want more than .005" side clearance. But there's a problem, aluminum spacers rubbing against aluminum rockers is not good because aluminum/aluminum galls badly. I would make the spacers allowing for a .015" shim (steel or brass) to be inserted between the rocker and spacer(still ending with the same .005" clearance). The shims are available for MP. That should give you good service.
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#3
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Comp Cams spec out .030 on their Pro Mags that have the solid spacer. Why don't you want to use the spirings?
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#4
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springs create to much drag.And yes I am using mp spacers with alum. spacers.I thought the idea of roller rockers was to reduce drag(and add hp).the springs feel tight.
thanks, Jeff 340 cuda |
#5
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There is another reason no to use springs(in my humble opinion), that is to eliminate any possiblility of the spring holding the rocker in such a position to retain some pressure on the pushrod. Any pressure on the pushrod helps to keep the lifter from turning. This is especially critical on a SB with it's 59 degree lifter bore and resultant wierd pushrod angle (even worse on W2s with offset rockers). I have always had lifter/lobe wear problems with W2s/ ultra radical flat tappet cams.
Don't let that rocker side clearance vary too much or you could have valve timing variations from cylinder to cylinder. |
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