Just Commodores Forum Community

It takes just a moment to join our fantastic community

Register

Cold start rattle on LS3

Discussion in 'VF Holden Commodore (2013 - ?)' started by Ron Burgundy, Oct 11, 2017.

  1. immortality

    immortality Moderator Staff Member

    Messages:
    12,224
    Likes Received:
    868
    Trophy Points:
    113
    Joined:
    Apr 15, 2006
    Location:
    Sth Auck, NZ
    Members Ride:
    HSV VS Senator, VX s2 Calais S/C
    Yeah it seems GM has changed the PCV/breathers for the later V6's. TBH the only real solution is to fit a catch can and stop that oil recirculating back into the intake and burning. Can't be good for emissions right?
     
    426Cuda, Ron Burgundy and HemiMagic like this.
  2. Ron Burgundy

    Ron Burgundy Well-Known Member

    Messages:
    1,311
    Likes Received:
    455
    Trophy Points:
    83
    Joined:
    Jun 3, 2004
    Location:
    NSW
    Members Ride:
    VF II SS
    Any legality issues with catch cans ?
     
  3. lmoengnr

    lmoengnr Well-Known Member

    Messages:
    1,210
    Likes Received:
    446
    Trophy Points:
    83
    Joined:
    Jan 15, 2012
    Location:
    Sunbury Vic.
    Members Ride:
    MY12.5 Maloo R8, MY12 Redline ute, Magnum 224
    As long as they don't vent to atmosphere, they are fine.
     
    immortality and Ron Burgundy like this.
  4. RTSV6UTE

    RTSV6UTE Active Member

    Messages:
    229
    Likes Received:
    104
    Trophy Points:
    43
    Joined:
    Jan 17, 2015
    Location:
    Melbourne
    Members Ride:
    Director build number 332..."CALDIR"
    Hi

    I wanted to shift to NSW just so I could get my cars modified and serviced by this guy. I have known him back in the days before Autowerks.

    Regards,

    RTSV6UTE
     
    Ron Burgundy likes this.
  5. Ron Burgundy

    Ron Burgundy Well-Known Member

    Messages:
    1,311
    Likes Received:
    455
    Trophy Points:
    83
    Joined:
    Jun 3, 2004
    Location:
    NSW
    Members Ride:
    VF II SS


    Nice result with cai and tune
     
  6. VCoz

    VCoz Member

    Messages:
    61
    Likes Received:
    24
    Trophy Points:
    8
    Joined:
    Jun 21, 2012
    Location:
    Brisbane
    Members Ride:
    VF2 Calais SW LS3 MY16
    I understand the frustration - as explained my LS3 makes the 'noise' when 'cold and under load'. Maybe we need to find a proven solution, without any conflicts of interest and an answer that doesn't have other negative effects - importantly won't impact on our remaining warranty.
    The US related forums have debated and had years of experience with these engines and also repeatedly covered this topic yet I haven't found evidence of poor longevity re many LS3 engines driven 'normally'. Certainly those concerned raise valid concerns about the noise - but until its determined from internal inspection that damage is being done through normal driving (expected if driving hard when cold), excessive oil consumption is occurring (correct oil used), factory tune (tuning not altered to richen too much), 95 or 98 fuel (not fuel detonation); otherwise what can we do? I'm not a motor engineer but do we worry ourselves to death or wait and see if anything gets worse while under warranty (what I regularly found on forums is that the noise is there from new and doesn't get worse or cause damage). Maybe someone can find the informed answers needed in the US sites and post it. Until then (link I found on a US site):
     
  7. Ron Burgundy

    Ron Burgundy Well-Known Member

    Messages:
    1,311
    Likes Received:
    455
    Trophy Points:
    83
    Joined:
    Jun 3, 2004
    Location:
    NSW
    Members Ride:
    VF II SS
    You are spot on mate
    To me .. monstar theory makes sense and I will let it go...
     
    426Cuda and monstar like this.
  8. blackve76

    blackve76 Well-Known Member

    Messages:
    1,194
    Likes Received:
    196
    Trophy Points:
    63
    Joined:
    Feb 9, 2013
    Location:
    there
    Members Ride:
    VE SS ute 360rwkw N/A, 2016 VF2 SS M6
    Bloody odd as my Jan 16 build is nice and quiet in the garage with headers etc when cold, maybe a bad batch has gone through with excessive bore clerence.
     
  9. Ron Burgundy

    Ron Burgundy Well-Known Member

    Messages:
    1,311
    Likes Received:
    455
    Trophy Points:
    83
    Joined:
    Jun 3, 2004
    Location:
    NSW
    Members Ride:
    VF II SS
    Very very unlikely plus in my case it does not explain the scenario
     
    Last edited: Oct 14, 2017
    monstar likes this.
  10. VCoz

    VCoz Member

    Messages:
    61
    Likes Received:
    24
    Trophy Points:
    8
    Joined:
    Jun 21, 2012
    Location:
    Brisbane
    Members Ride:
    VF2 Calais SW LS3 MY16
    Ron above you raised the Catch Can topic: here is a link (to the US SS forum) which you may be interested in (remembering in this topic and the 'piston slap' concern you have the Ls3 engine not a Ls2 or Ls1 which should be considered differently). If I still had a 3.6 SIDI I would get a Catch Can due to the reported carbonizing at the valve stems (as no petrol flushing in SIDI) but have for myself decided not needed for my Ls3. Member nothingtosehere SS Forum (Senior Member) provided the interesting graph copied below.
    http://www.ssforums.com/forum/engine-technical-discussion/78857-become-oil-catch-can-believer.html
    [​IMG]
    The link also shows the time driven this way/ambient temps for engine oil and water temp rises in that Ls3 (driven as shown by the average rpm blue line) which may also explain the 'cold loaded noise' duration some hear and others don't hear (my average rpm cold when I hear the 'noise' under load would be far less (under 2000rpm)) - one site suggested high idle speed for a short time helps reduce cold piston slap (I found a short idle before driving off helps). I assume your Ls3, like mine, is quiet at idle (cold or hot) and you hear no 'noise' when driven (variable rpm) at operating temperature. Thought this graph was worth raising.
     
    Last edited: Oct 14, 2017
    Ron Burgundy likes this.

Share This Page