Lifter preload?
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From: bayville/howell nj
Lifter preload? ok i just finshed building my forged 347 and now i just installed my scorpion 1.7rr's and iam coming up with 1 3/4 or a turn to 22 ft lbs. does that see like to much lifter preload? or do i need shorter push rods?
At 1 3/4 turns you have .082 preload.
Do you know your target preload?
Comp recommends adjustable rockers for those lifters presumably because their required preload range (minimum - maximum) is narrow.
Added:
Additional research indicates that Comp calls for a preload of 0.002 to 0.0004 inch. Some folks report satisfactory results using 0.010 inch and others have run preload based 3/4 turn. Thus, these lifters are designed to use adjustable rockers, but in any event the current 1 3/4 turns of preload is too high and you need 0.075 inch shorter push rod.
Do you know your target preload?
Comp recommends adjustable rockers for those lifters presumably because their required preload range (minimum - maximum) is narrow.
Added:
Additional research indicates that Comp calls for a preload of 0.002 to 0.0004 inch. Some folks report satisfactory results using 0.010 inch and others have run preload based 3/4 turn. Thus, these lifters are designed to use adjustable rockers, but in any event the current 1 3/4 turns of preload is too high and you need 0.075 inch shorter push rod.
Last edited by Darkman; Jun 3, 2010 at 09:13 PM.
