LT1 knock
#1
LT1 knock
Hi guys, im new to this forum and new to using forums so please forgive me if i've posted this wrong or in the wrong place.
I need help fast. I just installed a new opti on my car and it ran great. Got excited and took it out on the road and drove the **** out of it. Ran a nice hard pull on a straightaway and bam... Loud rattling/knocking noise began right as i was about to shift at ~5750rpm. My guess is its a rod/main bearing but i want to be sure its not valve train before i try to sell it.
Any help is appreciated. Thanks
I need help fast. I just installed a new opti on my car and it ran great. Got excited and took it out on the road and drove the **** out of it. Ran a nice hard pull on a straightaway and bam... Loud rattling/knocking noise began right as i was about to shift at ~5750rpm. My guess is its a rod/main bearing but i want to be sure its not valve train before i try to sell it.
Any help is appreciated. Thanks
#5
As far as i know bottom end is stock. Does have a mild cam though. It does sound like a heavy knock to me but i will post a video to see if you guys can identify it. I appreciate the replies
#7
TECH Apprentice
That almost sounds like maybe a push rod broke or rocker arm jumped off. Oil pressure looks good still. Pull that driver side valve cover and check your rockers. Check the other side too if that side is ok.
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#9
TECH Veteran
I think it sound more serious than valvetrain, but you should check it first. Flywheel interference can also make a nasty noise (if anything recent has been going on in that area).
#12
Didn't have time to pull valve covers today, but i did put an infrared temp gauge on the headers and the 2 rearmost ones (closest to firewall) were significantly colder than the rest. Also drained the oil and found small glitter sized metal shavings (some were slightly bigger) these were gold in color. I read somewhere that rob bearings, crank bearings, and cam bearings will all show gold flakes in oil. This leads me to beleieve that it could be a bearing but i need to be sure before i sell it lol.
#13
11 Second Club
Pull the valve covers...
#14
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#17
TECH Addict