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Dwell angle/point gap for 1976 Euro distributor setup

Discussion in 'Technical Q&A' started by Dandy_Don, Apr 5, 2004.

  1. Dandy_Don

    Dandy_Don Karting

    Dec 8, 2003
    102
    The Woodlands TX
    Full Name:
    Don McCormick
    Hi, I am looking for the dwell angle/point gap for a single Euro distributor setup on a '76 drysump engine. It has two sets of points in the single distributor, one driving each bank. GT car parts in Arizona has the rotor for about $85 and the point sets for about $35 each. They don't carry the cap which I am sure is expensive and I am inclined to just try and reuse the old one that I have. I am going to set it up initially for points/standard ignition but would like to eventually go with an electronic conversion.

    I have the two Crane XR700's on a '79 engine with twin distributors and after looking at it closely I cannot see how to adapt them for use in the single Euro distributor. It would seem that if one keeps the Euro distributor cap with its peculiar rotor setup- it's really two rotors in one and the cap is set up with two heights of contacts- then you really need to have two sets of points or optical triggers in the distributor and 2 coils- the distributor cam with its 4 lobes is really not tall enough to take two optical triggers and two shutters. I will call Crane cams in the morning but I am not hopeful. I understand from looking at some of the older threads that Pertronix will retrofit distributors (single as well as Twin??) but last time I checked they had a huge backlog and were quite expensive. To get the engine running I will invest in the points and the rotor but am interested in the electronic system because I have found it to be so reliable on the twin distributor setup. Thanx in advance for any help Don
     
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  3. Steve Magnusson

    Steve Magnusson F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    19,467
    Texas
    Full Name:
    Steve Magnusson
    I'm not expressly familiar with the space available inside of the "single" 308 distributor, but you don't need two shutter wheels --- you can just use one shutter wheel (with 4 slots at 90 deg) and mount the two optical pick-ups 135 deg apart physically inside the distributor (this gives 4 pulses at each pick-up separated by 90 deg of crankshaft rotation -- which is equivalent to the dual distributor set-up) -- just a thought...

    For the '76 Euro dwell spec -- download the corresponding OM from the Owners Site (but I don't see why it would be much different that the dual distributor set-up -- since like you noted, the "single" set-up is quasi-equivalent architecture-wise to the dual set-up with a "combined" cap and shared distributor shaft/cam)
     
  4. Dandy_Don

    Dandy_Don Karting

    Dec 8, 2003
    102
    The Woodlands TX
    Full Name:
    Don McCormick
    Steve, that is a great idea. The only difficulty will be in trying to get the two optical readers exactly 135* apart from each other. Now all I have to do is check to see if the 4 lobed distributor cam in the single distributor is the same as the one in the twin and then I am in business. Thanx a lot, it will save me a few steps and some money and it will be great to get to electronic on the first try. Don
     

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