Piston slap due to cams?
Thread Starter
Teching In
Joined: Jan 2006
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From: Charleston, SC
Piston slap due to cams? Just bought a 2000 corvette. dealer told me it has the exhaust/air intake/cam package that gm has. I've got two questions,
- I read on one of the forms that piston slap is normal for ls1 engines and especially if you have different cams in it. is there anyhting to worry about?
- nobody really could tell me what the package that I've got is and how much power it is supposed to give you...any of you all know anything abou it?
- I read on one of the forms that piston slap is normal for ls1 engines and especially if you have different cams in it. is there anyhting to worry about?
- nobody really could tell me what the package that I've got is and how much power it is supposed to give you...any of you all know anything abou it?
I've never heard of piston slap from having a diff cam in your motor. The cam has nothing to do with how the pistons slid up and down in the cylinder.
As far as exhaust, cold air intake and cam package - the only cam I can think of that it would possibly have is either the hot cam or a LS6 cam. As far as I know, GM doesn't make an exhaust or CAI for the cars....other than the factory stuff.
I think the person selling you the car was full of malarky.
As far as exhaust, cold air intake and cam package - the only cam I can think of that it would possibly have is either the hot cam or a LS6 cam. As far as I know, GM doesn't make an exhaust or CAI for the cars....other than the factory stuff.
I think the person selling you the car was full of malarky.
I don't think what you're hearing is slap. It is more likely valvetrain noise. I also have a 2000 corvette and the valvetrain noise is more evident. I also have a 2001 HD truck with the 6.0l motor and IT used to have minor...very minor slap, only when extremely cold (20-30 below zero) outside for about 2 or 3 minutes when it was warming up.
How many miles are on your car? Where are you located? Like stated above, if it's very cold where you are or you have a ring issue, which Chevrolet has a TSB on, then just to be sure, I would take it to another Chevrolet Dealer and ask what one of their mechanics thinks.
If you need more suggestions and are computer savvy, you could always make a video of your car idling and post it up here. If you need help, let me know.
How many miles are on your car? Where are you located? Like stated above, if it's very cold where you are or you have a ring issue, which Chevrolet has a TSB on, then just to be sure, I would take it to another Chevrolet Dealer and ask what one of their mechanics thinks.
If you need more suggestions and are computer savvy, you could always make a video of your car idling and post it up here. If you need help, let me know.
Last edited by NOSjohn; Jan 28, 2006 at 10:12 AM.
Thread Starter
Teching In
Joined: Jan 2006
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From: Charleston, SC
thanks alot for your help. i'm going to take it in and ask chevy. i just bought it so i hope i didnt get screwed, they told me it was normal. i can definately hear the valvetrain noise when im sitting inside which i have heard many places is normal. i am located in south carolina, and the car has 57000 miles on it. thanks again
Originally Posted by CorvetteUSCG
cool. should i worry about the slap? what should i do?
does it "slap" all the time? morning only? or when it's cold?
Good be normal,..could be anything. How loud is it? and can you hear EXACTLY where it is coming from?
Thread Starter
Teching In
Joined: Jan 2006
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From: Charleston, SC
well its cold hear now, and when the egine warms up, you can still hear it just not as much. nosjohn is probably right, its valvetrain noise, im just unsure. i cant tell exactly where it is coming from, im not good at finding problems, im a rookie.
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Originally Posted by CorvetteUSCG
well its cold hear now, and when the egine warms up, you can still hear it just not as much. nosjohn is probably right, its valvetrain noise, im just unsure. i cant tell exactly where it is coming from, im not good at finding problems, im a rookie.
werd. may be nornal,...alot of modern gm engines with similar arcutecture have valvetrain noise.
Headers, will make the sound louder as well...
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Verdad Gallardo You're welcome. I am guessing you didn't buy it from an authorized Chevy dealer? If not or if so, I would still take it to another dealer and ask what they think. Your car only has a few more miles than mine so I hope it's in good shape.
Here are a few TSB's on what we were discussing:
High oil consumption, ring issue>
http://corvetteactioncenter.com/kb/q....php?qstId=263 (1999-2002 models)
Engine knock or lifter noise>
http://corvetteactioncenter.com/kb/q....php?qstId=378 (2001-2003 other GM)
Here is the full list of Mechanical TSB's:
http://corvetteactioncenter.com/kb/c...y.php?catId=78
Also, make sure you are using at least 91 octane gas, you may be getting some audible knock from bad gas or low octane gas...unlikely but try putting in better gas.
Here are a few TSB's on what we were discussing:
High oil consumption, ring issue>
http://corvetteactioncenter.com/kb/q....php?qstId=263 (1999-2002 models)
Engine knock or lifter noise>
http://corvetteactioncenter.com/kb/q....php?qstId=378 (2001-2003 other GM)
Here is the full list of Mechanical TSB's:
http://corvetteactioncenter.com/kb/c...y.php?catId=78
Also, make sure you are using at least 91 octane gas, you may be getting some audible knock from bad gas or low octane gas...unlikely but try putting in better gas.
Thread Starter
Teching In
Joined: Jan 2006
Posts: 30
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From: Charleston, SC
just took another listen to the engine. the more i listen, the more i think it is valvetrain noise, it sounds like a sewing machine. im gonna take it in for maintenance anyways, ill ask them then
Thread Starter
Teching In
Joined: Jan 2006
Posts: 30
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From: Charleston, SC
i called one of my buddies that works for chevrolet, he said there is nothing to worry about. valvetrain noise is inherent with these cars, especially with the hot cam or whatever. he said it always makes noise until the engine is put under load.
Thanks again for all the help guys
Thanks again for all the help guys
My head/cam car had the same noise. It sounded like ****, but my tuner said it was normal when replacing heads and cam. It more or less amplified the sound. Never any problem though.
