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Thread: Motor burns oil

  1. #1
    Junior Member SHOW GUEST
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    Nov 2004
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    7

    Motor burns oil

    Hi,
    I just built a new big BBC 622, and it is in a street car. The block was cross hatched honed with 400 grit. The motor is a 4 3/4 stroke with 6.700 inch rod. I am running total seal gapless top ring. The rings are 1/16, 1/16, 3/16. After I broke the engine in I put in valvoline racing oil 20/50 . I have a couple 100 miles on the motor and it seems like it burns maybe 1/2 qt per 30 to 40 gallons of gas. This is my first big inch motor. Is this normal for a motor this size? or did I over look something?
    Thanks

  2. #2
    Senior Member RACING JUNKIE
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    Dec 2004
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    austin texas
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    729
    probably not. If it was built as a race engine it has a few extra thousands on some things and probably has no exhaust valve seals. Which is not a bad thing.

  3. #3
    Junior Member SHOW GUEST
    Join Date
    Nov 2004
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    7
    It has New teflon valve seals on the intake and exhaust valves
    thanks

  4. #4

    Re: Motor burns oil

    Quote Originally Posted by davelee
    Hi,
    I just built a new big BBC 622, and it is in a street car. The block was cross hatched honed with 400 grit. The motor is a 4 3/4 stroke with 6.700 inch rod. I am running total seal gapless top ring. The rings are 1/16, 1/16, 3/16. After I broke the engine in I put in valvoline racing oil 20/50 . I have a couple 100 miles on the motor and it seems like it burns maybe 1/2 qt per 30 to 40 gallons of gas. This is my first big inch motor. Is this normal for a motor this size? or did I over look something?
    Thanks
    I built a 400 with 6 inch rods once. The wrist pin was way up in the oil ring. That thing burned oil big time with 20w50 in it. Maybe a quart every 150 miles or so. Changed the oil to 10w30 racing oil and could get about 2K miles to a quart. I figure the rings just couldn't control the heavier oil as easily. I never got to find out exactly why. I've built a bunch of other engines similar to this with no problem since then.

  5. #5
    Senior Member RACING JUNKIE oldandtired's Avatar
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    Dec 2008
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    Sugar Hill, GA
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    1,368
    Do you have the low tension oil ring package?
    Dave
    http://www.racingjunk.com/profile/343797
    "All that is necessary for the triumph of evil is for good men to do nothing" Edmund Burke

  6. #6
    Senior Member RACING JUNKIE TheRabbit's Avatar
    Join Date
    Jan 2007
    Location
    Augusta, Ga.
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    2,295
    Quote Originally Posted by oldandtired
    Do you have the low tension oil ring package?
    X2.
    And I wouldn't run 20/50. The thicker oil with low tension rings will make it burn oil worse. I used 10/30.


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