vacuum with blower

[Frederic Breitwieser]

Generally, the same place it got it originally, from the engine crankcase. 
 However with a Turbo/Supercharger system, I don't think it affects the 
vaccuum, but its the advanced timing and cam modifications that do.  I had 
a high performance cam in a car I owned a while back, which idled extremely 
rough, but sounded good and gave me a lot of high-rpm horsepower.  I had to 
purchase an aftermarket belt-driven vaccuum pump from the local "Mothers" 
speed shop to give my power brakes enough vaccuum to work.

Fred

> > someone please tell me how a turbo/super-charged system
> > gets vacuum for the vac-assisted brakes and other vac-
> > operated accessories ?  Is the vacuum that is produced
> > during idle and decel stored and used?  My knowledge
> > of SC and TC systems is limited.