Car in bits again...
AO Silver Member
Join Date: Feb 2007
Location: Hampshire, UK
That is good news - now you have a baseline that works. There's really nothing to stop you disconnecting the vacuum advance permanently if you want to, although you may find your fuel consumption going up a bit!
Not sure how you might reduce the effect of the vacuum advance canister - extra return springs maybe (fiddly), reduce the vacuum depression by allowing in a controlled air leakage (difficult to calibrate)...
As I understand it, the internal construction of the advance canister has a thin metal diaphragm which not only acts as the actuator but also provides the return force. Maybe removing the canister and "exercising" the diaphragm via the pullrod might be the answer? Trouble is, the diaphragm is usually quite delicate.
My old Baccaruda had a Mallory dual-point with an adjustable advance canister - you put a small Allan key in the vacuum pipe hole and adjusted the diaphragm tension directly. I'm not sure the Mallory advance canister could be made to fit the Bosch dizzy, but that is the kind of adjustment you need. But perhaps there is an easier answer - how about elongating the pullrod hole so the diaphagm takes more vacuum to operate the advance?
Alfanauts are GO!!!