Page 2 of 2 FirstFirst 1 2
Results 16 to 19 of 19

Thread: Bye Bye to my VX already???

  1. #16
    Member Since
    Jan 2005
    Location
    Former owner of 01 Ironman #0723, 01 Dragon #0590
    Posts
    952
    Thanked: 0
    I always thought that one of the side benefits of a properly working EGR system was cooler cylinder temperatures.

    When I bought the first VX, the Isuzu tech(s) told me to immediately change the oil with Mobil 1 0W-30. Maybe this was to combat the oil drainage issue right off the bat.

    Wait a minute...
    3 piston rings, top to bottom
    Compression
    Compression
    Oil Control/scraper

    Crank case

    Why exactly does oil need to drain through a hole in the piston/ring land in order for it to be returned to the crank case -shouldn't it drain down there on it's own with every downstroke of the piston?

  2. #17
    Member Since
    Jun 2002
    Location
    2000 Dragon Green VX 0485
    Posts
    379
    Thanked: 0
    Quote Originally Posted by mbeach
    Wait a minute...
    3 piston rings, top to bottom
    Compression
    Compression
    Oil Control/scraper

    Crank case

    Why exactly does oil need to drain through a hole in the piston/ring land in order for it to be returned to the crank case -shouldn't it drain down there on it's own with every downstroke of the piston?
    That is what I thought initially, but my research into this subject turned up this interesting NASA report that addresses this issue ( albeit a different engine)

    This is a good read.Especially pages 4,5&6.

    http://naca.larc.nasa.gov/reports/19...ge00000004.gif
    Neither ordinary or extraordinary, just indefatigable.

    2000 VX Green Dragon- Chick Demagnitizer-Supercharger-Injen Intake- Cold air box-K&N- Power Vault SS Exhaust-265-75-16 BFG MT kms-On Board CO2- Custom Boulder Bars- Custom Skid plates- PIAA 520 Fog Lites-3inch lift with OME 912 Springs-LINE X Bedliner on Cladding & Hood Insert-ARB Front Lockers & Custom Bull Bar. Vintage Offenhauser Hood scoop Thule Rack. XM Radio-Custom Storage Box-First VX to surmount the RUBICON.Thanks Sierra Stompers

  3. #18
    Member Since
    Jan 2005
    Location
    Former owner of 01 Ironman #0723, 01 Dragon #0590
    Posts
    952
    Thanked: 0
    Excellent detective work -I learned quite a bit.

    Are the 3.5's pistons aluminum or steel?
    Also, has anyone tried replacing the scraper ring with one that is .003 thicker, so that it doesn't move so much with the ring land?

    I'd like to see oil consumption measures rated by the hour, rather than by the mile. I think that the stop and go nature of some driving contributes more to the pumping phenomena than anything else.

  4. #19
    Member Since
    Sep 2002
    Location
    '01 EBONY 1330 r.i.p. now '01 PROTON 0987
    Posts
    799
    Thanked: 0
    Only thing I can add is that the recycled exhaust gasses aren't as hot as the 1500 +/- degrees in the combustion chamber, so reintroducing METERED AMOUNTS of preburnt exhaust lowers the COMBUSTION CHAMBER temp by reducing oxygen content of the fresh charge ?
    Last edited by SGT.BATGUANO : 05/08/2005 at 11:09 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
$lv_vb_eventforums_eventdetails