Show whole topic Feb 20, 2019 6:01 pm
29invicta Offline
Member
Registered since: Jul 07, 2017
Location: Detroit area, Michigan, USA


Subject: Smiths rev counter drive off of Rotax AT146 dynamo?
Hi everyone -- I'm restoring my Dad's old 1929 Invicta 4.5 litre high chassis, and we're in the process of replacing the old 8-hour clock with a smiths rev counter. Since there's never been one on the car before, we will need to add a rev counter drive to get the count.

On good advice, we've heard that "you can take a drive off the rear of the dynamo I think - I have a feeling some Lagondas are done that way? In which case, you would need the little drive gearbox that bolts to the rear of the dynamo in order to achieve this, if your dynamo does not have that. You may need to ask the Lagonda Club about that option?"

So, does anyone out there have one of these drive gearboxes that goes on the end of a dynamo? Here's a blurry shot of the end of our dynamo (showing the shaft end, and also 3 mounting bolt holes).

Maybe it's like the one in post 1155 ?

Also, here's a shot attached of one off a CAV dynamo being restored at CDRC Ltd (the nice shiny-looking one on a bench)

If you can send pictures or give us a lead on buying or building one, I'd really appreciate it!

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