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Thread: Excessive Oil Consumption

  1. #1

    Default Excessive Oil Consumption

    Getting ready to take possession of a newly built motor with a Weiand 144. He is a friend of mine, and I trust him. He's had this supercharged 355 for a year now (he didn't build it). Normal driving it uses no oil, but at highway driving (higher RPMs) he's losing a quart every couple hundred miles! He's been all over that engine, and only can find some slight oil dampness at the valve covers and some "oil mist" on his hood. He has gone from a PVC type ventilation, to 2 breathers on the valve covers, but no change. He's had people follow him down the highway, and there is no visible smoke to indicate it's burning through the cylinders. He runs 80 lbs of oil pressure, 40# at idle, seems kind of high. We are stumped! We wonder if the crankcase has too much pressure. He said it's almost like it's vaporizing the oil since he can't seem to find any major leak. How are these things best ventilated? He admits it's a trailer queen, and the boost is set for max with the pulleys. I will detune with other pulleys, will that help? What to start looking for or to do?

  2. #2
    Join Date
    Dec 2009
    Location
    Connecticut
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    18,698

    Default

    Quote Originally Posted by davec5 View Post
    What to start looking for or to do?
    I would first call Weiand Technical Support:
    https://www.holley.com/about/holley/contact/
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  3. #3

    Default

    I had similar problem.
    Application: 383 Chevy 1997 Camaro MM6 trans 12 to 15 lbs boost press. ProCharger centrifugal F1A. 7.6 to 3.4 pulley driven.
    Tried many fixes. I had oil getting dirty fast. You may have this also. Oil mist flow due to positive crankcase pressure.
    Ring blow-by was the problem. The top to bottom pressure difference allowed for the rings to seal much better.

    Couldn't solve it until I went to external crank driven vacuum pump.
    This helped the rings to seal. Now, no problem. PCV system is gone.
    Designed to run on 1/3 ATM crankcase vacuum (5 psi vac). Van regulator.
    I use a vacuum pump manufactured from west coast. GZMotorsports.com.
    No vanes. It has a Rulon plastic wipers that have long life.
    His pumps are very different from the typical vane type.
    Been running for 8 years. Hope this helps. B.

  4. #4
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    18,698

    Default

    I believe most forced induction engines (N2O applications too) should eventually install a crankcase vacuum pump.
    I run a Moroso Enhanced Design 4-vane crankcase vacuum pump (no crank mandrel), and I can't imagine not having it.
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

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