<VV> turbo distrubutor

[FrankCB@aol.com]

In a message dated 4/22/04 5:18:41 PM Eastern Daylight Time, 
UltraMonzaWest@aol.com writes:
You can also "modify" / re- curve  the existing unit [  change the springs / 
remove ONE spring, etc.]  if you understand what you're doing...and even 
eliminate the NEED  for the VA  to get full advance...
    The only way I know of to eliminate the NEED for vacuum advance is to run 
the engine at only 2 levels of throttle opening - idle and full throttle.  
The internal combustion engine needs different ignition timing to run its best 
with different densities of air/fuel in the cylinders.  So small throttle 
openings make lower density air/fuel requiring earlier ignition timing (more vacuum 
advance) while larger throttle openings make greater density air/fuel 
requiring later ignition timing (less vacuum advance).  That's why virtually all 
engines (except the 150/180) use vacuum timing advance whether it's provided by a 
vacuum advance port on the carb or by a computer that "reads" the intake 
manifold vacuum and adjusts the spark timing accordingly.  To appreciate why they 
do this simply add vacuum advance to a 150 or 180 engine and produce BOTH 
better part throttle response AND better miles per gallon.
    Frank Burkhard