[TR] TR4a ignition advance

[spamiam at comcast.net]

Does anybody know the ignition advance information for the TR4A?

I know that stock static advance is 4 degrees BTDC, but what is the full vacuum advance?  What is the full mechanical advance?

Someone said to me that these engines can not tolerate all that much total advance (I.E. less than 30 degrees).  I would have expected that a total advance in the mid-30's would have been about right!

-Tony