do all LS1s have noisy valvetrains?
Thread Starter
Teching In
Joined: Jan 2002
Posts: 44
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From: MD
do all LS1s have noisy valvetrains? I have the known cold knock and its not that sound. It sounds like a skate board wheel spinning when i
have the hood open and rev the motor. The noise is coming from the center front area(not a specific spot)
and increases and decreases with rpm...even lasts past the rpms returning to idle rpm from a rev. I am just
checking with you guys just to make sure the engine is still ok <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
I really do NOT want to rebuild!!!
That cold knock also seems to not go away until the engine is well warmed(like 10 Minutes)
<img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />
have the hood open and rev the motor. The noise is coming from the center front area(not a specific spot)
and increases and decreases with rpm...even lasts past the rpms returning to idle rpm from a rev. I am just
checking with you guys just to make sure the engine is still ok <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
I really do NOT want to rebuild!!!
That cold knock also seems to not go away until the engine is well warmed(like 10 Minutes)
<img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />
TECH Apprentice
Joined: Jan 2002
Posts: 356
Likes: 0
From: Texas
Re: do all LS1s have noisy valvetrains? My 98 LS1 motor was failry quiet valvetrain wise when stock. There was a lot of discussion back on LS1.com, during the first year of the LS1, about the noise I believe you are referring to. It has something to do with a fuel system part, I think. Anyway, the valvetrain is definately noticable with the aftermarket cams. I personally think it has to do with the larger use of aluminum in this motor and the composite intake(I think its material is more dense than aluminum and transmits sound better), but that is just my thoughts on it.
Todd
Todd
Launching!
Joined: Mar 2002
Posts: 223
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From: McKinney Texas
Re: do all LS1s have noisy valvetrains? </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by G ForceSS:
<strong>I have the known cold knock and its not that sound. It sounds like a skate board wheel spinning when i
have the hood open and rev the motor. The noise is coming from the center front area(not a specific spot)
and increases and decreases with rpm...even lasts past the rpms returning to idle rpm from a rev. I am just
checking with you guys just to make sure the engine is still ok <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
I really do NOT want to rebuild!!!
That cold knock also seems to not go away until the engine is well warmed(like 10 Minutes)
<img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I thought the cold knock sound was sorta like a disel engine ... I believe that v8's have valvetrain noise as well as injector noise, my Mustang had it , and my SS has it as well. I do believe I have a bit of the cold knock, but it goes away after the engine is warmed up <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
Just my 2 cents
Crowley
<strong>I have the known cold knock and its not that sound. It sounds like a skate board wheel spinning when i
have the hood open and rev the motor. The noise is coming from the center front area(not a specific spot)
and increases and decreases with rpm...even lasts past the rpms returning to idle rpm from a rev. I am just
checking with you guys just to make sure the engine is still ok <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
I really do NOT want to rebuild!!!
That cold knock also seems to not go away until the engine is well warmed(like 10 Minutes)
<img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I thought the cold knock sound was sorta like a disel engine ... I believe that v8's have valvetrain noise as well as injector noise, my Mustang had it , and my SS has it as well. I do believe I have a bit of the cold knock, but it goes away after the engine is warmed up <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
Just my 2 cents
Crowley
Thread Starter
Teching In
Joined: Jan 2002
Posts: 44
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From: MD
Re: do all LS1s have noisy valvetrains? Hmmmm, it sounds more like the lifters are where it is coming from. My engine is fully stock with
the exception of the Turbo's. I also found that my manifold bolts are loose and a couple had
fell out <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" /> I also think a spark plug may have started to back itself out as well. I smelled exhuast everytime i would kick into it and at cold start up. Do you guys think that could cuase a condition inside the cylinder that could contribute to my knock etc...?
the exception of the Turbo's. I also found that my manifold bolts are loose and a couple had
fell out <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" /> I also think a spark plug may have started to back itself out as well. I smelled exhuast everytime i would kick into it and at cold start up. Do you guys think that could cuase a condition inside the cylinder that could contribute to my knock etc...?