lifter knocking after cam install
02-01-2004, 11:31 PM
#5
Originally Posted by blk~2000~Z28
Are you sure it is a lifter? I would go through and check the rockers to see if they were setup wrong.
well its sounds like a lifter but i will defenitely check the rockers, could one being loose cause this?thanks for your help, im just really dissapointed with my car!!!
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02-02-2004, 12:07 AM
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Originally Posted by SSideExhLS1
226 .585 111lsa on 918's. why would i not hear any noise when i first started it up,but later???
02-02-2004, 12:14 AM
#10
Originally Posted by blk~2000~Z28
Well at least you have the right springs for the cam. It (noise) might get worse when things start to warm up. As your valvetrain becomes hotter the tolerances get tighter and therefore could be responsible for the sudden noise vs. no noise when it was first started, just a theory.
well this is not normal noise, it is really loud knocking, im wondering if i did something wrong on the install??????i dont even know what to do now.
02-02-2004, 12:29 AM
#12
Originally Posted by BADZ
Make sure your adj on the rockers are correct as too much preload will cause serious problems, I know. I went through HELL in a hand basket with mine!!!!
well, would it make any sense that the rockers started making noise after several minutes??the more i drove it, the louder it got. first is was a continous knock, but after a while it was a knocks with pauses in between knocks and with a different noise.could that have caused any damages???
02-02-2004, 12:36 AM
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At idle can you listen to the engine to determine where exactly the noise is coming from? Try the hose method or the scredriver and see if you can rule out bottom end or top of the motor. If it is a loud noise maybe something is a lot worse than just noisy valvetrain. I still would keep my eye on the oil pressure, if the noise got worse as it was driven more then maybe as your oil warmed the pressure began to drop as well.
02-02-2004, 12:43 AM
#14
Originally Posted by blk~2000~Z28
At idle can you listen to the engine to determine where exactly the noise is coming from? Try the hose method or the scredriver and see if you can rule out bottom end or top of the motor. If it is a loud noise maybe something is a lot worse than just noisy valvetrain. I still would keep my eye on the oil pressure, if the noise got worse as it was driven more then maybe as your oil warmed the pressure began to drop as well.
02-02-2004, 12:57 AM
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could if be a lifter getting stuck?
02-02-2004, 03:36 AM
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JRP just talked to one of my friends had the same noise. He lost the hole motor. Rod let go and boom bitch. It started out quiet and progress from there.
02-02-2004, 07:51 AM
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You may need a longer pushrods. If your heads are not milled you may have too little lifter preload. Most aftermarket cams have a smaller than stock base circle. This reduces the amount of lifter preload. This is especially bad if you have a 98 or 99. The base circle diameter measures 1.552 diameter on these while the new cars approximately 1.520. The smaller the base circle means less lifter preload.