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Do all LS1 engines have the piston knock ?

This is a discussion on Do all LS1 engines have the piston knock ? within the Camaro / SS forums, part of the Vehicle Specific category; what do the tech people at the shop say?...

  1. #21
    car enthusiast djvaly's Avatar
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    what do the tech people at the shop say?

  2. #22
    Junior Member COYOTE SS's Avatar
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    Quote Originally Posted by djvaly View Post
    what do the tech people at the shop say?

    Who are you asking?

  3. #23
    Member 98Z-28Camaro's Avatar
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    Piston slap is not the hydralic lifters tapping. That noise is called the hydralic lifters tapping. Piston slap is where the piston actually rocks in its bore (like a rocking chair) until the temperature of the cylinder (piston and wall mainly) reach operating temperature as which point they expand to correct tolerances and it quits rocking in the bore. It almost sounds like a rod is knocking. The tapping noise (light sounding, not a lower toned tap) is just the lifter to pushrod, or pushrod to rocker arm or rocker arm to valve stem being out of adjustment. Neither of which are a huge deal, but should be repaired as soon as possible in my opinion. But the piston slap probably doesn't need to be worried about until an overhaul or the engine fails. Just my .02 cents.

  4. #24
    car enthusiast djvaly's Avatar
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    Quote Originally Posted by COYOTE SS View Post
    Who are you asking?
    Coyotee SS: for u .. so the dyno tune shop people said..?

  5. #25
    Junior Member COYOTE SS's Avatar
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    Quote Originally Posted by djvaly View Post
    Coyotee SS: for u .. so the dyno tune shop people said..?
    I had Doug Rippie up in Minnesota tune it and he said it was a lifter sticking and to use Seafoam. I used half a can with half a tank of fuel, this spring I'll use a full can with a full tank.

  6. #26
    Ricekiller z28punk's Avatar
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    im a newb to ls1's still. can someone post a sound clip of the piston slap noise? or is it to quiet to record?

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  8. #28
    Ricekiller z28punk's Avatar
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    sounds a lot like that 07 Z06 i drove at the dealership. lol

  9. #29
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    Gm aknowledges the noise but has stated that it has not been proven to cause premature engine failure.

  10. #30
    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Our engines are aluminum! (Different expansion rates than steel) Its normal!

  11. #31
    Junior Member slpws6ta's Avatar
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    where you live has nothing to do with it i live in southern florida and my car has piston slap operating tepm is operating temp no matter where you live. It may take longer for piston slap to go away for people in cooler climates but operating temp is still 210 if it's 100 out you can still get piston slap

  12. #32
    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by slpws6ta View Post
    where you live has nothing to do with it i live in southern florida and my car has piston slap operating tepm is operating temp no matter where you live. It may take longer for piston slap to go away for people in cooler climates but operating temp is still 210 if it's 100 out you can still get piston slap
    Well then it does have something to do with where you live!

  13. #33
    car enthusiast djvaly's Avatar
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    Quote Originally Posted by 9t8z28 View Post
    Well then it does have something to do with where you live!
    when it's cold out like 30s below I mean, coupled with higher altitude (less air density) as well then the engines tend to knock a bit. my 2 cents.

  14. #34
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    My ss has lots of piston slap. It takes a long time after start up for it to quiet down. When weather is cold the more noise it makes.

  15. #35
    We'll be back... GatorSS's Avatar
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    Mine does not have piston slap.

  16. #36
    MOTOR CITY MARO' SSTODD's Avatar
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    Try a different oil and/or a different weight as some oils make the sound worse. Mobil 1 is very thin and makes more noise IMO.

  17. #37
    Senior Member ShelbySS's Avatar
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    Quote Originally Posted by SSTODD View Post
    Try a different oil and/or a different weight as some oils make the sound worse. Mobil 1 is very thin and makes more noise IMO.
    So what is the best oil for an LS2?

    I used Mobil 1 in my LS1...

  18. #38
    Senior Member ShelbySS's Avatar
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    Quote Originally Posted by z28punk View Post
    im a newb to ls1's still. can someone post a sound clip of the piston slap noise? or is it to quiet to record?
    You'd know if you heard it...

  19. #39
    MOTOR CITY MARO' SSTODD's Avatar
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    Sarge is the oil guru but I believe he had good things to say about royal purple so I'M going to give it a shot this spring when I pull it out of the garage

  20. #40
    Speak the truth jad628's Avatar
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    No slap here. 74K +.

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