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Standard or .001 extra

Posted by Sam's GSX, May 19, 2020

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  1. Sam's GSX

    Sam's GSX Proven Member

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    I know this has been answered, but I can only look for about 30 minutes before getting a headache.
    Just a quick question.
    For my specific build, should I get .001 extra oil clearance or standard?
    Eagle rods, wiseco stroker pistons, eagle 100mm crank with .010 mains, and standard rod journals.
    Its has balance shaft delete kit, and I believe the oil squirters or blocked off (machine shop has the block now, and that's what he said)
    Obviously will be getting .25mm for the mains, shooting for around 400-450whp.
    Thanks and sorry if this is beat to death.
     

    Street Build 382  3

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  2. jakelandry

    jakelandry Proven Member

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    Minden, Louisiana
    The proper way is to mic everything.
     

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    1995 Mitsubishi Eclipse GSX
    11.410 @ 125.490 · 2G DSM
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  3. Sam's GSX

    Sam's GSX Proven Member

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    Mic?
     

    Street Build 382  3

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  4. llxkevinxll

    llxkevinxll Proven Member

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    1996 Eagle Talon TSi AWD
    13.06 @ 105.75 · 2G DSM

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    1992 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM
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  5. Sam's GSX

    Sam's GSX Proven Member

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    Oh ok, I do already have the measurements, it's more so that I've seen people run either of these, and was wondering what is best with no balance shaft and oil squirters blocked off? And if I go with extra clearance, I'll probably need to use thicker oil, like 20w50?
     

    Street Build 382  3

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  6. donniekak

    donniekak DSM Wiseman

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    You want around .0025” clearance, use whatever bearing gets you there.
     

    Street Build 4K  0

    1991 Eagle Talon TSi AWD
    manual · 1G DSM
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    Hickory-NC-2Ggsx likes this.
  7. Sam's GSX

    Sam's GSX Proven Member

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    Dang, I going with king xp, and they only have .002 and .003 for standard journals.
    I might go with .002
    I'm not ever going to be pushing more than 500hp, was just making sure it's ok with my oil pressure.

    Edit, this is still a daily driver, so I went with .002, thanks guys
     

    Street Build 382  3

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  8. donniekak

    donniekak DSM Wiseman

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    You won’t know what the clearance is until you measure the crank journals and bearing bores.
     

    Street Build 4K  0

    1991 Eagle Talon TSi AWD
    manual · 1G DSM
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  9. Sam's GSX

    Sam's GSX Proven Member

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    Ok gotcha, so if it measures. 0020 clearance, could I ask the machine shop to take off .0005 ?
     

    Street Build 382  3

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  10. jakelandry

    jakelandry Proven Member

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    The proper method is mic the crank, check the bearing bore with a set of bearings installed (using a bore gauge), take the difference and adjust from there. More often than not, a polished crank with standard bore bearings and brand new rods gets you between .002 and .003”. It’s not as easy as just buying standard or oversized bearings and getting the right clearances.

    For reference, I recently put together a motor with new rods and a polished crank near the bottom of its Mitsu-supplied spec. I bought 3 sets of rod bearings mixing oversized and undersized halves until I got the numbers I wanted. It is a very time consuming task that takes the appropriate tools and a clean environment.

    The quick and dirty method with the highest probability of success assuming you don’t have all the proper tools would be to buy a set of std bore bearings and plastigauge. Since the crank mains have been cut I assume the rods have been polished so the clearance will probably be north of .002” and will do fine at 500hp.
     

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    1995 Mitsubishi Eclipse GSX
    11.410 @ 125.490 · 2G DSM
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  11. Sam's GSX

    Sam's GSX Proven Member

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    Ok, that helps thanks so much man
     

    Street Build 382  3

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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