<VV> Vacuum Advance? Re: custom distributor curve?

[BobHelt at aol.com]

NO NO! The retard will work at low rpms as long as there is minimal  boost. 
Boost starts around 2000rpm. Frank, look at the 65 Shop Manual page  6Y-16 
fig 11. Pressure retard retards spark to below static setting.
 
Regards,
Bob Helt
 
 
In a message dated 2/22/2013 4:56:03 P.M. US Mountain Standard Time,  
robertkhenry at bellsouth.net writes:

Consider  the completely stock turbo Corvair that  comes with NO vacuum
advance  and only has pressure ignition  RETARD that works at rpms ABOVE  
4000
(for the 1965 and 66  models).  Driving these cars in  traffic means using a
CONSTANT FIXED  ignition timing (24 degrees  BTDC) until you get above 4000
rpm AND  achieve some  boost