355 cam alignment | FerrariChat

355 cam alignment

Discussion in '348/355' started by Buzzl, Dec 14, 2018.

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  1. Buzzl

    Buzzl Formula Junior

    Feb 13, 2016
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    #1 Buzzl, Dec 14, 2018
    So my car was idling rough and surging at high rpm heavy load (what you experience with WOT start off). I always suspected something was not right in looking at repair0 orders after the last engine out. The people that did the last major obviously didn’t know what they were doing. Anyway, you can see in the attached photo Image Unavailable, Please Login what the problem is.


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  2. taz355

    taz355 F1 Veteran
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    #2 taz355, Dec 14, 2018
    Wow not even close likely off a tooth.
    Still need to check to be sure.
    What method are you going to use to check it
     
  3. Andy 355

    Andy 355 Formula Junior

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    #3 Andy 355, Dec 15, 2018
    They are assembly marks only. Best degree it to verify. The assembly marks are usually very close though. A lot of people say, oh, my headers failed early.... cam timing has a direct correlation to header life.
     
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  4. Buzzl

    Buzzl Formula Junior

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    #4 Buzzl, Dec 15, 2018
    Car is at ***************** in Atlanta and in good hands with Wade Williams. He said something about attaching a “degree wheel” I believe.


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  5. WATSON

    WATSON Two Time F1 World Champ
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    #5 WATSON, Dec 15, 2018
    Could that condition bend a valve or two??
     
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  6. Buzzl

    Buzzl Formula Junior

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    #6 Buzzl, Dec 15, 2018
    We shall see.
     
  7. Dave rocks

    Dave rocks F1 World Champ
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    #7 Dave rocks, Dec 15, 2018
    So, how did you position the motor before taking that photo? What is the reference - are you at TDC and if so, how did you find TDC?
     
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  8. Buzzl

    Buzzl Formula Junior

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    #8 Buzzl, Dec 15, 2018
    This is the photo that Wade sent me. He is working on the car. Not sure. I want to say he did some measuring from the top of the piston. I could be wrong though. I’ll find out.


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  9. Dave rocks

    Dave rocks F1 World Champ
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    #9 Dave rocks, Dec 15, 2018
    Thanks - did not realize Wade was already into it. You are in very good hands and I'm certain he took that picture with #1 at TDC.
     
  10. ernie

    ernie Two Time F1 World Champ
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    #10 ernie, Dec 16, 2018
    My thoughts exactly.
     
  11. Buzzl

    Buzzl Formula Junior

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    #11 Buzzl, Dec 20, 2018
    IMG_2815.mov




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  12. taz355

    taz355 F1 Veteran
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    #12 taz355, Dec 20, 2018
    Huh
     
  13. Buzzl

    Buzzl Formula Junior

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    #13 Buzzl, Dec 22, 2018
    Tried to post a video with the degree wheel. Anyway, cams were off 15 degrees. Don’t know the margin of error for the wheel.


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  14. Dave rocks

    Dave rocks F1 World Champ
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    #14 Dave rocks, Dec 22, 2018
    The wheel doesn't really have error unless it's running out, the pointer is not very secure or it's very small. But, Wade knows what he is doing so you will be fine. 15 degrees off is a **** load!
     
  15. taz355

    taz355 F1 Veteran
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    #15 taz355, Dec 22, 2018
    If wade has time to post would like to see how close th factory marks are now. I know when i chcked mine they were very close.
     
  16. SeattleM5

    SeattleM5 Formula 3
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    #16 SeattleM5, Dec 22, 2018
    Here's what mine looked like after timing the cams last month. The 1-4 bank cams looked dead on with the marks while the 5-8 bank cams were within the notch but not exactly in the center. I used Dave's piston stop to determine TDC

    Image Unavailable, Please Login
     
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  17. taz355

    taz355 F1 Veteran
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    #17 taz355, Dec 22, 2018
    Mine only has the small lines From what i remember and was like your very close to being perfect
     
  18. taz355

    taz355 F1 Veteran
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    #18 taz355, Dec 22, 2018
    I also checked after five years and when comparing it looked as if there was not change. Not Even the width of. The line so i do not think the belts stretch an observable amount.
     
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  19. johnk...

    johnk... F1 World Champ
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    #19 johnk..., Dec 23, 2018
    How many years have I been saying belts don't stretch significantly? Nice to see some verification. Can't stretch because if they did the pitch would change and the teeth would not mesh correctly with the cam sprockets and the belts would chew themselves up in no time.

    So the OP's cams were 15 off. My calibrated eye ball figured about 12 from the pictures.
     
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  20. WATSON

    WATSON Two Time F1 World Champ
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    #20 WATSON, Dec 23, 2018
    How did that pass a compression check in that condition?
     
  21. yelcab

    yelcab F1 World Champ
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    #21 yelcab, Dec 23, 2018
    You may be getting bent valves ...
     
  22. taz355

    taz355 F1 Veteran
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    #22 taz355, Dec 23, 2018
    I tried with mine to move 1 cog and thats what it looked like i thought.
    What do you think John is 1 cog about 15 degrees??
     
  23. Dave rocks

    Dave rocks F1 World Champ
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    #23 Dave rocks, Dec 23, 2018
  24. taz355

    taz355 F1 Veteran
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    #24 taz355, Dec 23, 2018
    Ugg
    I remember that pic now.
    Thanks
     
  25. taz355

    taz355 F1 Veteran
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    #25 taz355, Dec 23, 2018
    It does make sense though from what I have seen
     
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