Re: TPI Vacuum at idle

[frels@rosharon.camco.slb.com (Mike Frels)]

At 06:29 PM 1/24/2000 -0600, you wrote:
>I seem to remember mine pulling around 20" or so. I can check if you want.
>14" sounds low, although I do have the 87auto no-lift cam.

My '86 auto cammed TPI pulls 22 inches of vacuum. To me 14 sounds low. The 
rule I had always gone by was 13 inches should be minimum for driveability.

Mike



> > Hey, anyone know off hand what a stock '85 TPI auto 305's idle vacuum
> > should be?  Keep in mind that it has the same cam as the later model 5
> > speeds (little longer duration & more lift than the auto's of 86 up)
> >
> > Mine is at 14"@ about 575RPM.  I think this may be causing some off idle
> > derivability issues for the ECM...