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  1. #1
    Uncle Toys

    What caused fuel to get in my oil? Could this have caused the engine to blow up?

    I am still trying to understand why after two weeks and 29 hours with a super charger, one of my engines blew up. Two weeks after the incident, we dropped in a new engine and took it on the lake for a water test. A couple of minutes out I notice the oil pressure on the old engine (port side) was about half normal. Upon checking the dipstick, we found fuel in the oil. Limped back, changed the oil and took the Whipple supercharger off. Now I am back to stock 6.2s.

    The mechanic told me if I had continued running the engine it probably would have blown just like the starboard engine had. Probably would have seized a bearing.

    Dustin and I just discussed this on the phone and he believes the fuel could get in the oil by: over rich, detonation, or bad rings. Itís hard for me to believe its bad rings on both engines after only six month and 71 hours total time. Detonation, I donít know? Over rich Ė Dustin feels it would have shown on the spark plugs or my transom.

    Up until this event, the consensus had been I ran the engine out of oil. I thought that was far fetched, but didnít any evidence or the technical ability to debate it. In a weird way I am glad to find the fuel in the oil and get me of the hook for not putting oil in the engine.

    What do you guys think? Help me understand!

  2. #2
    Registered PhantomChaos's Avatar
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    Formula FASTech 382 Sunseeker Apache 45
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    Dec 2000
    Bell Canyon, CA


    That sucks UT. Just the kind of worry I have about putting Whipples on my Hp500EFI's.

  3. #3
    Registered Havasu Hangin's Avatar
    Join Date
    Sep 2001
    273.76 miles from Havasu

    How about the intakes?

    A bad seal on the intakes might force fuel into the crankcase...

  4. #4
    Registered Pure Energy's Avatar
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    2001 Superboat Y2K
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    Oct 2000
    N. NJ, Eastern LI
    If the fuel is washing throught the cylinders and getting in the oil it will cause a problem. I am having a rich condition issue right now with mine. My plugs are black and the treads have gas on them. The motors run good but will load up, I get black smoke when comming down from plain at about 2000 rpm, long idles, flooding at start up, and hesitation when hitting rough water or big waves at speed, but I do not have fuel in the oil. I do not know how the fuel could be getting in your oil but it will dilute the oil enough to cause damage. Good luck

  5. #5
    Member #2 ....Jeeezz Charter Member cigarette1's Avatar
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    Oct 2000
    Kicked to the curb
    A non-blower motor will have a larger piston/cylinder gap than what would be ideal for a blower motor. Pressurized fuel going into a cylinder, with a generous piston clearance, could force fuel pass the rings

    That must be a pisser ... good luck with getting it squared away.

    Last edited by cigarette1; 07-29-2002 at 06:54 PM.

  6. #6
    Charter Member #232 Charter Member Audiofn's Avatar
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    1979 Formula 302, 99 Formula 353, 81 Donzi 18 2+3 with 454
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    Oct 2000
    Carlisle, MA USA
    CIG1 I think that his blocks were stock and he just added the whipples. I am amazed that this had Dustin stumped He from what I hear does not sell things until they are really tested. I am sorry to hear about your problems.

    Put your best foot forward!

  7. #7
    Charter Member Charter Member Raypanic's Avatar
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    Formula 400SS Eliminator 236 Eagle XP
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    Oct 2000
    Lake Orion, MI. USA
    When Tyler re-worked my engines he put different rings on because of the blower application. So far no gas in oil after about 25 Hours on each engine. One I am losing a little oil because of a small leak. I check the oil Every Time out just to look for "too much oil" thus indicating fuel in the oil. So far so good for me. I would call a Big name engine builder and discuss their experiences.

  8. #8
    Gold Member Gold Member Turbojack's Avatar
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    2003 Eliminator 30' Daytona
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    Houston, TX, USA
    When you checked your oil could you smell the gas?? Detonation - no way,

    Over rich, yes, but I agree with Dustin about if over rich it should up on the transom or spark plugs. Were plug checks coming out perfect every time, & I am assuming transom has shown no signs of getting black.

    Bad rings, possible but both motors to have this problem & being fairly new, I don't know. If the rings were bad that would be showing up by too much blow-by (blowing oil out the breathers or dip sticks.)

    With the one motor torn down that you blew, What do the pistons, & cyld. walls look like? Got any pictures?, maybe they will give us an idea.

    Ok, I have to ask, Do you ever check the oil??

  9. #9
    VIP Member VIP Member BruceK's Avatar
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    40 Fountain Lightning
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    Jun 2001
    Is is a carb motor or EFI? If it is carbed, I would check in to your fuel. Had a B class raceboat and one race prior to the start motor just quit and then hydralic'd. Pulled plugs and found fuel. Ended up being dirt clogging the jets. Drained fuel, cleaned jets, never had a problem again. Hope that helps.

  10. #10
    Registered later's Avatar
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    98 42 fountain twin 500's
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    Oct 2000
    Chesterfield Mo/Loto
    ive had electric fuel pumps and a sticking needle valve in the carb fill a crank case full of fuel. if you have electric fuel pumps without percautions or even if wired to you ignition you leave the key on to listen to music wouldnt take long.
    just a thought

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