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Thread: Bad Cam??

  1. #1
    suck my wake's Avatar
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    Bad Cam??

    Anyone ever hear of a cam going bad?

    I had little or no compression in 2 cylinders after a rebuild, did a leak down test and found 5%, 15% 17% from front to back. Lapped the valves and got 3% 5% 4% and still very little compression in mid and back cylinder 50 and 75 psi. Pressurized the cylinders at BDC with the rockers off to check for out of round and each cylinder held 100 psi. for 10 mins. SO the block, pistons, rings, head gasket, head and valves are FINE!!! The cam/crank timing was checked only like 10 times The only thing left is the cam and rockers, changed the cam out and BANG!!!!!!!! COMPRESSION 135 across the board, purrs like a kitten lappin milk SO my question is has anyone ever encountered this problem before OH and by the way there is no obvious problem with the cam and it is a "51" cam out of an 06' I replaced it with a "51" cam out of an 07'.....Anybody??????


  2. #2
    Nothin' better than Doo'in it! BigDaddyRXP's Avatar
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    I just realized that there are two " suck my wakes" on this forum... suck my wake & SUCKMYWAKE

  3. #3
    mrbtd's Avatar
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    Wow !!!!!!!!!!! Nice find Tommy. I know that must of been making you crazy.

  4. #4
    Orlando Shark's Avatar
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    did you check that the timing chain was correct on the first one?

  5. #5
    suck my wake's Avatar
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    Quote Originally Posted by ImAShark View Post
    did you check that the timing chain was correct on the first one?
    Brand new timing chain, in fact brand new EVERYTHING inside this motor. It is a complete rebuild

  6. #6
    suck my wake's Avatar
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    Quote Originally Posted by mrbtd View Post
    Wow !!!!!!!!!!! Nice find Tommy. I know that must of been making you crazy.

    Dude you have no idea, I was going crazy. What in the world is different with this cam? First of all I don't know how this ski ran before so I don't know if it was like this originally but it certainly is a weird find.

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