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b20/b16 leaking compression

Discussion in 'General Tech and Maintenance' started by gundal, Jul 6, 2008.

  1. gundal

    gundal New Member

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    Have a b16a head on a b20b block, missing bad, compression tests results: 180 150 90 0 ( 1 2 3 4 respectively in honda order) any idea what compression leak could be or next step in diagnosing? Any help appreciated.
     
  2. boostin4fun

    boostin4fun Boosted ls/vtec ohh yeah!

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    Sounds almost like you might have some bent valves. Have someone do a leakdown test to pinpoint the leak.
     
  3. INJEN78

    INJEN78 HS LEGEND

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    possible headgasket problem too!!
     
  4. gundal

    gundal New Member

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    used a new cometic MLS 84mm nonvtec block to vtec head gasket

    but it is leaking oil externally onto the block, under the head gasket.
     
  5. the.original.kermit

    the.original.kermit I know everything

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    What??

    Do a leakdown anyways.
     
  6. INJEN78

    INJEN78 HS LEGEND

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    ok so did you clean the surfaces well?!?!were there any irregular scratches,or gouges??
     
  7. the.original.kermit

    the.original.kermit I know everything

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    Yeah, sounds like hg, notice the low compression on 3 as well. Could be dirty mating surfaces, warped head/block... etc.
     
  8. gundal

    gundal New Member

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    head was decked,

    i just pulled the valve cover, only thing i can notice irregular was one of the valves on the 3rd cylinder of the exhaust side was a little higher then its pair,

    other then that I cannot see anything wrong then again I havent seen many cylinder heads.
     
  9. the.original.kermit

    the.original.kermit I know everything

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    burnt/bent valve... Do that leakdown!
     
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