Valve train noise!!!
Thread Starter
Teching In
Joined: Apr 2011
Posts: 6
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Valve train noise!!! THIS is my first post to this forum..........
i have read over and over about the LS valve train noises and have tried to remedy mine.....
engine::: 2005 lq9---comp cam stick (230"sduration/617-622 lift)-comp springs/retainers/locks---.........025 longer hardened pushrods-comp trunion kit when i adjusted preload,has right at 2 turns past 0 lash,fron what i have read this should be primo?? this motor carries 50-60 psi oil pressure at 2000rpm but tha valve train sounds HORRIBBLE!! I am running the oem lifters, is that the next step? this motor is loud enough that i am concerned. HELP TIA
i have read over and over about the LS valve train noises and have tried to remedy mine.....
engine::: 2005 lq9---comp cam stick (230"sduration/617-622 lift)-comp springs/retainers/locks---.........025 longer hardened pushrods-comp trunion kit when i adjusted preload,has right at 2 turns past 0 lash,fron what i have read this should be primo?? this motor carries 50-60 psi oil pressure at 2000rpm but tha valve train sounds HORRIBBLE!! I am running the oem lifters, is that the next step? this motor is loud enough that i am concerned. HELP TIA
It's not an oil issue. You have too much preload and are most likely bottoming out the pistons in the lifters. From what I have read on Tech, (if you are talking about the amount of turns from 0 lash on the rocker bolt) you want to be at 1/2 turn to 1 turn on the rocker bolt from 0 lash. This is where it can get confusing, 1 full turn = .049 of movement @ the bolt, but what you need to figure in is the rocker arm ratio. The rocker arm ratio is 1.7 but the rocker arm comes off the seat @ 1.54, so if my math is correct 1/2 turn = .037 preload and 1 full turn = .075 preload. Hope this helps!
Thread Starter
Teching In
Joined: Apr 2011
Posts: 6
Likes: 0
Thanks for the replies..... i had searched also, i thought everyone was reccomending 2 turns from zero lash.....thats how i came up with the .025 longer pushrods. it was also noisy with the stock length pushrods. so, the concensus here is 1 full turn after zero lash? i am using stock rockers with the comp cams trunion kit. TIA
