<VV> Pinging turbo

[FrankCB at aol.com]

In a message dated 4/8/2008 2:09:24 PM Eastern Daylight Time,  
Sethracer at aol.com writes:
[SNIP]

No  mechanical advance should come in until some high RPM number, 
like 2500  RPM. The Standard (non-turbo) distributors start advance at 1500 
RPM   or even less. With 24 degrees of initial advance, you don't need that   
advance. 



[SNIP]
 
    Seth is partly correct that the mechanical advance  in the LM turbo 
distributor doesn't begin "until some high RPM number" except  that the number is 
more like 4000 RPM when it begins.
    So with the stock distributor you're stuck with a  CONSTANT timing 
advance (at 24 degrees) all the way from idle speed until you  reach 4000 rpm OR 
until you reach boost pressure at which point the timing will  retard from the 24 
degrees basic.  Needless to say, for street driving,  this stock setup give 
both lousy part throttle acceleration AND lousy gas  mileage.
    See my chapter on Turbocharging in the "Corvair  Basics Manual" for a 
further discussion and what to do about it.
    Frank "the stock turbo was a good BEGINNING"  Burkhard
    
    



**************Planning your summer road trip? Check out AOL Travel Guides.    
  (http://travel.aol.com/travel-guide/united-states?ncid=aoltrv00030000000016)