Author Topic: 1930 Douglas ignition timing questions  (Read 211 times)

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Offline yoshimasa negishi

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1930 Douglas ignition timing questions
« on: 13 Jul 2020 at 17:32 »
1930 Douglas ignition timing questions

Hello

I am now restoring two Douglas.

1930 Model L-3 350cc
1931 Model D-31 600cc

I would like to know the proper angle for the ignition timing of 350 cc and 600 cc of magneto

Offline Doug

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Re: 1930 Douglas ignition timing questions
« Reply #1 on: 13 Jul 2020 at 21:31 »
I have not seen a handbook for the L3, but the ignition timing would be the same as the 1931 model A31 350cc side valve. The handbook for the A31 states full advance as 40 degrees BTDC.

The 1929-30 T6, S5, S6 handbook states full advance to be set at 34-37 degrees BTDC for the 500/600cc. They would have used the same setting in 1932.

-Doug

Offline yoshimasa negishi

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Re: 1930 Douglas ignition timing questions
« Reply #2 on: 14 Jul 2020 at 06:50 »
Hello Doug

Thanks for the precise advice
I will set the ignition timing of L-3 at 40 degrees BTDC.
Soon the engine will be back from the internal combustion store.

Yoshimasa

 

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