Spun Bearing(s)?
Thread Starter
Joined: Apr 2003
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From: Tallahassee, Florida
Spun Bearing(s)? http://www.youtube.com/watch?v=z3sdg...page=1&t=t&f=b
took this video this morning before i went to work(i had the cutouts open the prvious day, so hearing this was impossible). Sunday went on a cruise and roll raced a 03 Cobra, as i would have shifted to 5th(not to race, no racing in 5th), the car shut off @ ~120mph. yikes. i've been having alternator issues lately so i thought it finally died on me. wasnt the case, it cranked back up(clutch depressed so the rpms were not up high) and i could see my oil psi now dropped to ~20-22psi. i slow down and ease it a few more miles home ~ 6pm. as it sits til 10 pm i crank it back up, oil psi comes back up to right around 40psi. fast forward to this morning and the video, in the video oil psi comes up to about 45-50psi now, but makes that god awful noise that im hoping it is not.....an oil starved bearing.
anybody?
took this video this morning before i went to work(i had the cutouts open the prvious day, so hearing this was impossible). Sunday went on a cruise and roll raced a 03 Cobra, as i would have shifted to 5th(not to race, no racing in 5th), the car shut off @ ~120mph. yikes. i've been having alternator issues lately so i thought it finally died on me. wasnt the case, it cranked back up(clutch depressed so the rpms were not up high) and i could see my oil psi now dropped to ~20-22psi. i slow down and ease it a few more miles home ~ 6pm. as it sits til 10 pm i crank it back up, oil psi comes back up to right around 40psi. fast forward to this morning and the video, in the video oil psi comes up to about 45-50psi now, but makes that god awful noise that im hoping it is not.....an oil starved bearing.
anybody?
Does the knock get louder or quieter with higher RPM'S? What about cold vs. hot?
There also seems to be a squeaking that I can't make out in the video.
P.S. I've always thought your camaro is one of the best looking I've ever seen. Well, for a few months at least.
There also seems to be a squeaking that I can't make out in the video.
P.S. I've always thought your camaro is one of the best looking I've ever seen. Well, for a few months at least.
Tech Resident
Joined: Jan 2006
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From: Philly
i'm gonna go with cracked piston or broken lifter. it sounds like either the infamous LS1 tick or piston slap on steroids. i think either could kill your oil psi, correct? i know the pistons in the LS1 are weak, so if you cracked one, i wouldn't be surprised if you have an 11 second car.
Thread Starter
Joined: Apr 2003
Posts: 853
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From: Tallahassee, Florida
it is not rpm related, which has got me stumped. i originally felt this vibe/(i hate to say it) slight knock through the shifter. trannt shifts and engages fine, its been goen through before and never gave me probs. sitting in the car and feeling it on the shifter, and standin in front of the car and feeling it on/in the intake, i cant tell where its coming from or if its even internal.
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Tech Resident
Joined: Jan 2006
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From: Philly
Originally Posted by slmdLS1
wouldnt a cracked piston lose compression and barely run?
did you do a compression test? that would be an indicator of a cracked piston. i'd put my money on cracked piston or broken lifter.
honestly, i don't know what a cracked piston sounds like. all i know is, it sounds like piston slap on steroids. that's what i'm basing my guess on.
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Verdad Gallardo Thread Starter
Joined: Apr 2003
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From: Tallahassee, Florida
Originally Posted by ChocoTaco369
sounds to me it is barely running and trying not to die. you probably wouldn't directly notice a compression drop. you'd just feel a loss in power - which i'm sure you wouldn't know since i doubt you dared to go WOT with that noise!
did you do a compression test? that would be an indicator of a cracked piston. i'd put my money on cracked piston or broken lifter.
honestly, i don't know what a cracked piston sounds like. all i know is, it sounds like piston slap on steroids. that's what i'm basing my guess on.
did you do a compression test? that would be an indicator of a cracked piston. i'd put my money on cracked piston or broken lifter.
honestly, i don't know what a cracked piston sounds like. all i know is, it sounds like piston slap on steroids. that's what i'm basing my guess on.
i have been at work all day, no time to look into it. im hoping i can limp it around the corner and get a better opinion/analysis tomorrow. luckily i have a truck to drive from work.
i appreciate ya'lls time and ideas, keep em coming.
TECH Addict
Joined: Nov 2005
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any cracked piston damage would cause the engine to run extremely roughly and would make a knocking sound as it would have no compression in that cylinder and would probably smoke out the oil cap. The oil would also be contaminated with fuel. Not to mention the SES light would blink like mad from the engine not running correctly.
If a bearing was spun, oil starved or damaged, the noise you get will change with RPM. Actually any valvetrain damage would also create a noise that changes greatly with rpm.
It sounds to me like a belt or something outside the engine.
If a bearing was spun, oil starved or damaged, the noise you get will change with RPM. Actually any valvetrain damage would also create a noise that changes greatly with rpm.
It sounds to me like a belt or something outside the engine.
Thread Starter
Joined: Apr 2003
Posts: 853
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From: Tallahassee, Florida
Originally Posted by Berry's 98SS
Sounds to me like you split the piston. Man that would make anybody 
I hope you atleast won the race though. Good luck.
I hope you atleast won the race though. Good luck.lol. actually i didnt. his heat soaked car made 455rw after ~20 pulls and an hour and a half on the dyno. he got me by a car, if that. I also got jumped and lost to a H/C/geared/355 lt1 on a 150+ shot by about a car and a half. it wasnt exactly a good day.
Thread Starter
Joined: Apr 2003
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From: Tallahassee, Florida
after driving it a little, its looking like a (couple) Rod Bearing(s). internally, its almost obvious this one's done.
who has the best budget ~550rwhp forged 408's?
who has the best budget ~550rwhp forged 408's?
11 Second Club
Joined: Mar 2005
Posts: 165
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From: Tallahassee,FL
Originally Posted by slmdLS1
after driving it a little, its looking like a (couple) Rod Bearing(s). internally,
Originally Posted by sstony
I recomend verifying exactly whats wrong and fixing it. prolly way cheaper than a built motor by a company
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