TPI Vacuum at idle

[Bruce & Lisa Wilcox]

My 355 TPI (warm cam) pulls about 14 -15 " of vacuum at 800 RPM.

Bruce Wilcox
-----Original Message-----
From: Mike Frels <frels at rosharon.camco.slb.com>
To: gmecm at diy-efi.org <gmecm at diy-efi.org>
Date: Tuesday, January 25, 2000 5:04 AM
Subject: Re: TPI Vacuum at idle


>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...
>
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