How much preload do you add?
10-13-2003, 07:18 PM
#1
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Join Date: Jul 2000
Location: Buffalo, NY
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How much preload do you add?
How much preload do you guys add to your rocker arms? Ive always added 1/2 but there always seems to still be some clacking. Ive always tried to avoid more since I didnt want to bog the car down with too much preload.
What is theoretically best for best power? 0 preload?
Just wondering what everyone had to say before I go adjust the rockers again tommorow.
What is theoretically best for best power? 0 preload?
Just wondering what everyone had to say before I go adjust the rockers again tommorow.
10-13-2003, 08:44 PM
#6
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I made a post like this a while back in the Advanced section and didn't get a whole lot of replies.
If you want the best answer and have normal style hydraulic lifters, then you want to push the plunger down into the lifter appx. .020-.060. This can be accomplished by either using a dial indicator, or scribing the pushrod with a known mark and then scribing it again after the preload is set. Then you measure the distance between the two marks.
That's according to Crane BTW.
If you want the best answer and have normal style hydraulic lifters, then you want to push the plunger down into the lifter appx. .020-.060. This can be accomplished by either using a dial indicator, or scribing the pushrod with a known mark and then scribing it again after the preload is set. Then you measure the distance between the two marks.
That's according to Crane BTW.
10-13-2003, 09:10 PM
#7
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Location: Christiansburg, VA
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i did what frank, 12SCNDZ, did pretty much
with engine running, loosen rocker until i hear clacking and oil splattering everywhere, then tightened with with my fingers, until it stopped clacking (pretty much finger tight), then add 1/8 with wrench and lock the nut down.
Jesse
with engine running, loosen rocker until i hear clacking and oil splattering everywhere, then tightened with with my fingers, until it stopped clacking (pretty much finger tight), then add 1/8 with wrench and lock the nut down.
Jesse
10-14-2003, 04:19 PM
#9
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When I did my cam swap, I initially set them at ½ then loosened/retightened them (one at a time) with the engine warmed up and running at ½ again.
I've had no problems, but if for some reason I have to remove the rockers, I'll do the final set @ ¼ next time.
I've had no problems, but if for some reason I have to remove the rockers, I'll do the final set @ ¼ next time.
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