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  1. #1
    Matatan tocullo's Avatar
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    Any gains or benefit on a lightened OEM Cam??

    Is there a benefit or gain on a stock 629 cam lightened?


    Thanks


  2. #2
    shrabber's Avatar
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    Less rotating Mass Is always a benifet but There's a equation in everything. I just do a 29 Cam and Find the sweet spot Most of the Time some retard our full retard like me . I would rather see you look into cp Pistons and send your head off to slow91 Or start off with Head. If your going full rebuild cp Pistons Standard Bore If possible full rebuild yada

  3. #3
    shrabber's Avatar
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    PS Your not to far from Me as long as you buy the beer and have some live entertainment (Women Under 40 all there teeth) Im sure I can come Labor Free

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  5. #4
    Matatan tocullo's Avatar
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    Well I'm still debating if I want to do a full rebuild it seems like a lot of Mula and time. Lol My engine has only 90 hrs on it and probably 5hr with the ET145, so I was wondering if I can just do some work to the head since I'm only going to be running at 9000rpms?

    Quote Originally Posted by shrabber View Post
    Less rotating Mass Is always a benifet but There's a equation in everything. I just do a 29 Cam and Find the sweet spot Most of the Time some retard our full retard like me . I would rather see you look into cp Pistons and send your head off to slow91 Or start off with Head. If your going full rebuild cp Pistons Standard Bore If possible full rebuild yada

  6. #5
    Matatan tocullo's Avatar
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    Wow sounds fair!! Wait until you see my mother in law!! Lol

    Quote Originally Posted by shrabber View Post
    PS Your not to far from Me as long as you buy the beer and have some live entertainment (Women Under 40 all there teeth) Im sure I can come Labor Free

  7. #6
    ADAMBOMB's Avatar
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    Quote Originally Posted by tocullo View Post
    Wow sounds fair!! Wait until you see my mother in law!! Lol

    Quote Originally Posted by shrabber View Post
    PS Your not to far from Me as long as you buy the beer and have some live entertainment (Women Under 40 all there teeth) Im sure I can come Labor Free
    :yay2: Heyyyyy Girrrllll

  8. #7
    shrabber's Avatar
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    Quote Originally Posted by tocullo View Post
    Well I'm still debating if I want to do a full rebuild it seems like a lot of Mula and time. Lol My engine has only 90 hrs on it and probably 5hr with the ET145, so I was wondering if I can just do some work to the head since I'm only going to be running at 9000rpms?

    Quote Originally Posted by shrabber View Post
    Less rotating Mass Is always a benifet but There's a equation in everything. I just do a 29 Cam and Find the sweet spot Most of the Time some retard our full retard like me . I would rather see you look into cp Pistons and send your head off to slow91 Or start off with Head. If your going full rebuild cp Pistons Standard Bore If possible full rebuild yada
    Well this is down Time so Its up to you.. I know when we do automobiles with say 100,000 niles we tend to shy away from just doing a valve Job because we call it "Top Heavy". Meaning we created better Up top compression but kept the same lower compression i/e rings,bores etc. On your ski 90 Hours is not Much But it is a 2006. I had 70 Hours On My 08 Block That im building (bores were beautiful)But I just wanted it out of the way . Now keep in mind your running a 20 lb Boost charger that really is a race charger that should run on race fuel but can be run On pump with some Timming adjustments. I myself would be doing it all at Once if I was running that beast. Take your time and steal a 100 Here and there from your mother n law tell Her your saving Money for Her Daughter's Future

  9. #8
    big john's Avatar
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    i'm going to add my two cents here, lightening your cam and rotating mass is great for quick acceration in the 1/8 mile or 1/4 mile race, but a heavier rotating mass would be better for long distance endurance, it produces a wider touque curve and help keep the momentum of the motor going, of course to a extent. i really don't think lightening the cam is going to do anything for performance since its diameter is so small it really doesn't create a rotating/recipicating mass like the crank does, as for balancing, the 4-tec motor has a balance shaft to help smooth the motor, that must be taken into consideration in the balanceing if the cranhshaft assm. its well known the light weight alumnum rod motor can break rods if allowed to come down from RPMs in the top end, this is of course my opinion as i'm just a professional mechanic and engine builder........... i might be way off here.

  10. #9
    Matatan tocullo's Avatar
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    Thanks to you guys for taking the time to explain this!!

  11. #10
    shrabber's Avatar
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    Quote Originally Posted by big john View Post
    i'm going to add my two cents here, lightening your cam and rotating mass is great for quick acceration in the 1/8 mile or 1/4 mile race, but a heavier rotating mass would be better for long distance endurance, it produces a wider touque curve and help keep the momentum of the motor going, of course to a extent. i really don't think lightening the cam is going to do anything for performance since its diameter is so small it really doesn't create a rotating/recipicating mass like the crank does, as for balancing, the 4-tec motor has a balance shaft to help smooth the motor, that must be taken into consideration in the balanceing if the cranhshaft assm. its well known the light weight alumnum rod motor can break rods if allowed to come down from RPMs in the top end, this is of course my opinion as i'm just a professional mechanic and engine builder........... i might be way off here.
    +1 Spot On john As I started I guess Im looking at it From My standpoint and also As I stated There Is a equation In everything You Give and Take Sacrifices you have to decide its also a gamble. You need to Know what you want to accomplish.
    Last edited by shrabber; 12-06-2012 at 05:56 PM.

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