gcc, 68K and ignition advance

Dale Ulan ulan at ee.ualberta.ca
Wed Nov 30 14:05:59 GMT 1994


> 
> On Tue, 29 Nov 1994, Wouter de Waal wrote:
> 
> Some one probably already jumped on this, but it's the venturi vacume, 
> and it increases as you suck more air into the carb.
> 
> If you could get two carbs off of some newer cars, you could control the 
> mixture with your computer too! It might be real fun!
> 
The VW is the only car I've seen that uses venturi vacuum to advance the spark.
That's because they didn't put a centrifugal advance in their distributor.
Actually, this isn't always true... some VW's did have a cent. advance.

Everybody else uses a ported or manifold vacuum source to advance the
spark under light loads, and they use a centrifugal advance to move the
spark up at higher speeds.

-Dale



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