Timing of a 1930 Norton model 18

Submitted by carl_sanders on Sat, 19/12/2015
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Can anyone please advise me of the timing of a 1930 Model 18.

I believe it to be 1/2" BTDC fully advanced but not 100% sure as I also read on the net it to be 3/8" BTDC fully advanced.

Thank you

Submitted by michael_sullivan on Sat, 19/12/2015

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Stupid question:

Why is there a 3/32" (or 4 degrees) difference in timing between a magneto set-up and a points and coil system?

Mike

Submitted by david_cooper on Sat, 19/12/2015

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Just a theory... but if static timing is set further advanced than necessary it can always be retarded on the hand lever. But it owners leave it at full then there is a risk of blowing holes in pistons. Model 30 book figure for the first year or two is much more advanced than later..maybe Norton decided to publish safer figures after user problems? Could that be why?David

Submitted by richard_cornish on Sat, 19/12/2015

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Previously michael_sullivan wrote:

Stupid question:

Why is there a 3/32" (or 4 degrees) difference in timing between a magneto set-up and a points and coil system?

Mike

Hi Mike,

I think the difference may be down to the increased compression that was used as the late 50s alloy head ES2 was up to 7 to 1 from the earlier cast iron version's 6.5 to 1. Regards, Richard.


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