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Thread: Which Lucas dynamo does a BJ7 have? A C45??

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    Jedi Knight
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    Which Lucas dynamo does a BJ7 have? A C45??

    We've got our car tucked away for the winter, complete with a noisy dynamo. It's not at all accessible for the next few months and I wasn't smart enough to check which model Lucas dynamo I've got. Can anyone (kindly) advise if it was the C45, or some other model, that the BJ7 came with? Thanks, Doug
    1959 pristine 948 cc Bug-Eye; DCOE, 5 speed; bought 1971
    1960 BE bought 1971 & stored since; body tub restored and reassembling (1275; etc.)
    1962 AH 3000 BJ7; 3rd owner (1982?); in shop Oct. 2015 for paint job - home soon!
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    Re: Which Lucas dynamo does a BJ7 have? A C45??

    C 45 for AH 3000s including BJ 7's. Consider conversion to an Dynamator alternator which is design to look like our original generator (pic below). I purchased one for my BJ-7 from a Canadian-based distributor. This fun and worthwhile conversion also includes planning: NEGATIVE ground; modifying voltage regulator to a terminal block; running a 10G wire direct to battery lead (at solenoid); possibly switching wires on e-fuel pump and installing original generator pulley onto the Dynamator (I purchased the larger aluminum one from Denis Welch Motorsports). GONZO


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    Yoda steveg's Avatar
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    Re: Which Lucas dynamo does a BJ7 have? A C45??

    Won't larger pulley on alternator make Dynamator spin slower, start charging later and cool less?

    Alternators have smaller pulleys than DC generators. Less mass to spin.
    Steve Gerow
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    Yoda
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    Re: Which Lucas dynamo does a BJ7 have? A C45??

    Quote Originally Posted by steveg View Post
    ... Alternators have smaller pulleys than DC generators. Less mass to spin.
    ... and more RPMs for a given engine speed, hence the greater output (in part).

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    Re: Which Lucas dynamo does a BJ7 have? A C45??

    Understood. DWM's large pulley option is matched to original AH 3000 pulley dimension. The one I installed charges at 14.3V at 900 - 1100 RPM and about the same as the generator it replaced. At idle speeds anywhere between 400 to 700 RPM the Low (field) charge lamp does not glow - idle set at 650 RPM.

    In addition to lots of surface area around the Dynamator case, those fins offer quite a bit of air circulation for cooling. I believe the Dynamator has Bosch internals.

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