Definitive Cam Timing for 328??? | FerrariChat
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Definitive Cam Timing for 328???

Discussion in 'Technical Q&A' started by GTHill, Jul 17, 2008.

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  1. GTHill

    GTHill F1 World Champ
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    GT Hill
    #1 GTHill, Jul 17, 2008
    Just as the title says... I'm looking for the correct cam timing for the 328. It seems that I have read that the owner's manual is wrong, otherwise I would look there. Thanks!

    Gene
     
  2. Futureman

    Futureman Formula 3

    May 16, 2007
    2,024
    #2 Futureman, Jul 17, 2008
    Are you talking about the timing wheel diagram in the service manual as being incorrect? We used it for mine and found it to be pretty much right.
     
  3. GTHill

    GTHill F1 World Champ
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    #3 GTHill, Jul 17, 2008
    Pretty much? :)

    Gene
     
  4. Futureman

    Futureman Formula 3

    May 16, 2007
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    #4 Futureman, Jul 18, 2008
    Well, with the size of the degree wheel we had and the dial indicator we rigged up, it was hard to be "dead-on" accurate. But it was so close that we decided that human error was probably more of a factor than the timing actually being out.
     
  5. yelcab

    yelcab F1 World Champ
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    #5 yelcab, Jul 18, 2008
    Gene

    What is it you are trying to do, and what is it you are looking for?
     
  6. GTHill

    GTHill F1 World Champ
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    #6 GTHill, Jul 18, 2008
    I'm trying to degree the cams (cam timing) correctly. The engine isn't apart yet so no rush, but I seem to remember a lengthy debate on proper cam timing.

    I've been looking through some older threads and really the debate is the method more than the number. Below are a few threads that pertain to the topic.

    http://www.ferrarichat.com/forum/showthread.php?t=94546

    http://www.ferrarichat.com/forum/showthread.php?t=135182

    So I guess my thread isn't really on topic anymore. I would like to see the proper confirmed cam timing numbers. Thanks!

    Gene
     
  7. jimpo1

    jimpo1 Two Time F1 World Champ
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    #7 jimpo1, Jul 18, 2008
    Right now in Dallas, where my 328 is, it's 12:23pm and 96 degrees. So, the cams are in that degree at this time.

    :D
     
  8. GTHill

    GTHill F1 World Champ
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    #8 GTHill, Jul 18, 2008
    I'm not sure I have much of a response to that extreme display of logic... :)

    Oh, I'm going to be in Dallas week after next. I won't have the Ferrari since I'll have it down for some work, but it would be cool to see almost all of you. :) Just kidding Jim... I love you man...


    Gene
     
  9. yelcab

    yelcab F1 World Champ
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    #9 yelcab, Jul 18, 2008
    In my limited experience, if you really really really care about this stuff, what you should do is

    1. Put a degree wheel on the crankshaft which will help you decide exactly the crankshaft position where the exact TDC of number 1 cylinder is. Then leave it there. (How to get to that point is a matter of opinions, debate and I have my own, but I won't need to get there today).

    2. Then, all you need to do is to line the cam shafts timing marks to all the alignment marks on the cam housing, and then leave them there.

    3. Install the timing belts, and use the pins-sprocket allignment to get the belts to go on correctly without disturbing the positions of the cams and the crank.

    Then, you are home free.

    The only other engines I have worked on that require a more exacting method of cam timing is the Porsche 911. And even there, we all just assume that at Z1 crankshaft mark, the engine is TDC (and very few of us ever pull out a degree wheel to ensure that). Then we mess with the cam shaft position to get to an overlap measurement specified by Porsche to be within 0.1mm.

    And if you really don't care about this stuff, just line up everything using factory marks, install the belts, and go.
     
  10. GTHill

    GTHill F1 World Champ
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    #10 GTHill, Jul 18, 2008

    Thanks for the response. The main problem I see is that most people will agree that the cam timing marks are incorrect from the factory. According to a lot of experts, those marks were just for simple alignment to prevent valve to piston contact until an actual cam degree procedure was performed. That is what is going to be painful. :)

    Gene
     
  11. BigTex

    BigTex Seven Time F1 World Champ
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    #11 BigTex, Jul 18, 2008
    See if you can pick Dave Helms' brain on this, he'll get your feet on the ground....not so much Incorrect as no where near as close as the Degree Wheel approach
     

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