VCCA Home Forums TECHNICAL - 1945 AND EARLIER 1933-1936 How much vacuum and centrifugal advance? 34 Master

Are there any specs on ignition timing vacuum and centrifugal advance for a 1934 Master? How many degrees, and at what rpm?
Thanks.

The only thing I can find is max. vacuum advance 17 Deg. and 37 Deg. for the centrifugal. RPM not given. Guess would be well over 3000 RPM.

Most internal combustion engines run best at 36 deg. full advance.

Thanks for your answers!
Some say that we can advance timing on ours cars about 8 dagrees more because of the better fuel we have today. That would mean up to 45 dagrees advance then (...).

Yes, it you set the octane selector at "0" (center mark) and set the timing with a timing light at the prescribe ball at idle the timing is adjusted for running 65 octane gas. Then you can fully advance the octane selector and run modern 85-87 octane, and with out using a timing light. If advance is too much the starter will kick-back or bind. If it does then retard the timing a small amount.
I always ran mine at full advance as it increases the power and fuel mileage.

Does that means that the vacuum advance is 17 degrees in addition to the basic 10 degrees advance (27 degrees total)?
And the centrifugal advance is 37 degrees in addition to the basic advance (10 degrees) and vacuum advance (17 degrees) again, making a possible total of 64 degrees advance...?
If this is not correct, how would you understand it?

I have adjusted the timing on my '35 Std. 207 engine according
to Genes' recommendation, advancing the octane selector 8 deg.
The engine runs great at this setting, plenty of 'pep' and
starts easily even after a 'hot soak'. Remembering back (73)
years, to my days in High School Auto shop, we had both a Sun
engine analyzer and a Sun distributor machine. In those days,
we removed the distributor to replace points and condenser! There was book of specs in the drawer under the distributor machine, but, truthfully I have not seen that book of specs
since! My gut feeling is the specs listed here are correct!

The vacuum advance is not in operation due to low vacuum at the high engine speed so 17 Deg. of advance is subtracted.

1934 shop manual page 137.
Master vacuum advance 17 Deg. at full vacuum condition, centrifical advance 36 Deg. Maximum. The 36 Deg. (octane selector set in center at zero) .Fully advancing the octane selector another 10 Deg, gives a total of 46 Deg. at Max. engine speed.

1935 has much less advance. 12 Deg. for vac. and 28 Deg. for Cent.

Thanks!