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283 smokes once it gets up to temp?

Discussion in 'The Hokey Ass Message Board' started by selohssa, Aug 26, 2010.

  1. selohssa
    Joined: Jun 16, 2009
    Posts: 443

    selohssa
    Member

    I have a 283 chev small block that fires up right away and seems to have decent power. Once it warms up, it smokes a lot. it has dual exhaust and smokes from both pipes. I like this engine and would like to retain it even though I have a good running 400 small block that would drop right in.

    WHAT IS MY PROBLEM? ANY ADVICE?
     
  2. What are you running for oil? (assuming it's blue smoke coming out of the tailpipes.)

    If it's white smoke....head gasket?
     
  3. my guess would be it's a bit worn out. or maybe it is sucking oil through a PCV valve
     
  4. its prolly old enough to smoke
     

  5. selohssa
    Joined: Jun 16, 2009
    Posts: 443

    selohssa
    Member

    10w30 oil. Blue smoke.
     
  6. 36tbird
    Joined: Feb 1, 2005
    Posts: 1,142

    36tbird
    Member

    valve guides. have you looked at your plugs?
     
  7. brad chevy
    Joined: Nov 22, 2009
    Posts: 2,627

    brad chevy
    Member

    Are you having to add oil or water regularly or not.?
     
  8. JohnEvans
    Joined: Apr 13, 2008
    Posts: 4,883

    JohnEvans
    Member
    from Phoenix AZ

    Oil return holes in heads blocked with sludge? Badly worn valve guides. Diluted oil from leaky fuel pump. ???
     
  9. strawberry
    Joined: Sep 13, 2008
    Posts: 291

    strawberry
    Member

    when it gets warm? or all the time? might be time for a rering,
     
  10. Mr48chev
    Joined: Dec 28, 2007
    Posts: 33,861

    Mr48chev
    ALLIANCE MEMBER

    That's probably pretty light oil for a tired engine. I'd suggest running a compression test and see what the compression is but most likely the thing is worn out and needs a rebuild. Or at least a ring and valve job.
     
  11. Normal for a 2 stroke...ring ding ding ding ring ding ding ding
     
  12. slimpick
    Joined: Aug 4, 2008
    Posts: 97

    slimpick
    Member

    Probably rings and/or guides. A leak down test will give you a good idea of whether you need new rings and/or a valve job.

    blue smoke - oil
    white smoke - water
    black smoke - way too rich - or you have your old Detroit Diesel running just right
     
  13. dudley32
    Joined: Jan 2, 2008
    Posts: 2,160

    dudley32
    Member

    Are you running an intake with a front oil fill and rear draft tube .....?
    If not you could be building pressure in the block...d32
     
  14. selohssa
    Joined: Jun 16, 2009
    Posts: 443

    selohssa
    Member

    Rear draft tube? The intake has a fill tube on the front. The engine has around 20,000 miles on it but it sat for a long time. I will do a compression test and report back.
     
  15. That brings up a very good point.


    Often a road tube could get restrictive simply because someone forgot to clean out the steel wool or mesh screen hiddin inside the road tube.

    Make sure you check the road tube ESPECIALLY if you see a cotter pin stuck in the side of it or a couple holes drilled thru the side of the tube or a wire sticking out. That can tell you there is something inside you need to fish out and clean. Even if you don't see that, check to be sure it is clear.

    Ditto for the front breather cap if it hasn't been soaked and flushed in a while.
     
  16. selohssa
    Joined: Jun 16, 2009
    Posts: 443

    selohssa
    Member

    Well, I have to give a big thank you to all of your advice. It was mostly black smoke but I saw a hint of blue and figured that it must be all oil (I was wrong). I took the advice of mr48chev. I changed the oil to a heavier weight and also threw some additive for engines that were designed for use with leaded gasoline into the tank. the little bit of blue went away but the big amounts of black remained. I got some advice from a carb guy and fooled around with the carb for a while. BAMM, no more smoke of any kind. I am going to send the carb for a rebuild anyway but I am just glad that it runs nice now.

    Thanks again
     

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