cam timing
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cam timing

  1. #1
    Senior Member skippers WFOT's Avatar
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    Default cam timing

    building a hopefully 500hp engine for my jet boat. trying to get that 5-6k range. have a coyle roller set with the 3 different keyways. would it be in my interests to retard advance or stay (stock)? will anything but stock effect valve to piston clearance? if i set it up at 4deg how does that effect the set up of the timing tab?

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  3. #2
    Senior Member cyclone's Avatar
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    Quote Originally Posted by skippers WFOT View Post
    building a hopefully 500hp engine for my jet boat. trying to get that 5-6k range. have a coyle roller set with the 3 different keyways. would it be in my interests to retard advance or stay (stock)? will anything but stock effect valve to piston clearance? if i set it up at 4deg how does that effect the set up of the timing tab?
    it will effect it. depends on the lobe profile how much of an effect but as you advance it you're going to lose intake p to v clearance.

    In my case I loose about .007 intake valve p to v clearance for every one degree that I advance the cam timing.

  4. #3
    Senior Member skippers WFOT's Avatar
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    Quote Originally Posted by cyclone View Post
    it will effect it. depends on the lobe profile how much of an effect but as you advance it you're going to lose intake p to v clearance.

    In my case I loose about .007 intake valve p to v clearance for every one degree that I advance the cam timing.
    cam is a pro comp 11-244. the pistons are a slight dome engine is a 402 BBC

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  6. #4
    Senior Member GT Jets's Avatar
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    Quote Originally Posted by skippers WFOT View Post
    cam is a pro comp 11-244. the pistons are a slight dome engine is a 402 BBC

    IMHO, degree the cam in a check for proper clearances, the deck height, cam timing, total lift and so on will all effect piston to valve clearance issues.

    I would also be sure to check for valve spring coil bind problems and proper rocker arm geometry...There is no such thing as overchecking....

    Just my opinion, hate doing stuff twice.
    GT


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  7. #5
    Senior Member skippers WFOT's Avatar
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    Quote Originally Posted by GT Jets View Post
    IMHO, degree the cam in a check for proper clearances, the deck height, cam timing, total lift and so on will all effect piston to valve clearance issues.

    I would also be sure to check for valve spring coil bind problems and proper rocker arm geometry...There is no such thing as overchecking....

    Just my opinion, hate doing stuff twice.
    learning as i go just trying to find out how much benefit of advance or retard would get me for this mild build or should i just play it safe

  8. #6
    Senior Member Futs's Avatar
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    Quote Originally Posted by skippers WFOT View Post
    learning as i go just trying to find out how much benefit of advance or retard would get me for this mild build or should i just play it safe
    just degree it in as the card says...wont really benefit with such a low HP deal.

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