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78 308 GTS flywheel timing marks

Discussion in '308/328' started by bl10, Jun 15, 2020.

  1. bl10

    bl10 Karting

    Jun 8, 2011
    106
    #1 bl10, Jun 15, 2020
    Hey guys

    The flywheel on my 308 has the normal 7degree BTC and PM1-4 TDC mark, however, there is a 3 degree ATC stamping. What is it used for? Just curious. Image Unavailable, Please Login
     

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  2. bl10

    bl10 Karting

    Jun 8, 2011
    106
    #2 bl10, Jun 15, 2020
  3. full_garage

    full_garage Formula 3
    Owner

    Feb 15, 2010
    2,207
    Sarasota Florida
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    Jay
    #3 full_garage, Jun 15, 2020
    My recollection is this is the mark for European single distributor car- timed at 3 degrees ATC
     
  4. thorn

    thorn F1 Rookie
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    Aug 7, 2012
    2,886
    Tallahassee, FL
    #4 thorn, Jun 15, 2020
    I would think the 3 degree mark is the next one (marked 3 degrees).

    (Which is used for timing advance/retard)
     
  5. Steve Magnusson

    Steve Magnusson F1 World Champ
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    Jan 11, 2001
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    Steve Magnusson
    #5 Steve Magnusson, Jun 15, 2020
    1978 US version 308 have a stock 1000 RPM idle timing specification of 3 deg ATDC (when operating on the R2 points).
     

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  6. bl10

    bl10 Karting

    Jun 8, 2011
    106
    #6 bl10, Jun 15, 2020
    Thanks. I didn't see that in my manual but makes sense.

    Barry
     
  7. Steve Magnusson

    Steve Magnusson F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    19,928
    Texas
    Full Name:
    Steve Magnusson
    #7 Steve Magnusson, Jun 15, 2020
    If you have the 150/78 OM for '78-'79 North American (a.k.a. US) version 308 B/S, see pages 14 and 73-77.
     
  8. bl10

    bl10 Karting

    Jun 8, 2011
    106
    #8 bl10, Jun 15, 2020
    Steve
    I see it in the owners manual. I was checkted my workshop manual, which is for a Carbed 308 gt4, an it does say basic timing is 3 - 2 ATDC @ 1000 +\- 200 rpm and actually the illustration of the flywheel does show the 3 degree ATDC. The illustration I was looking at in my notes from the web doesn't have the 3 degree indicator and it has a 6 degree BTDC mark not 7. Must be from a different year, probably GTSI. My bad.

    Barry
     

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