[DeTomaso] Minimum Idle Vacuum?

Mark McWhinney msm at portata.com
Tue Nov 27 13:28:33 EST 2007


The stock cam pulls 21 inches, but I do not know what the minimum is for the
booster.

Some alternative ideas:

- You can use a vacuum reserve canister to help with low vacuum from your
new cam ($35-79 at Jegs part #555-63010)

- There are also electric vacuum pumps you can bolt up under the front
trunk, so you can just ignore the whole vacuum issue and get the cam you
really want.

- You can just run without a booster.  Some people do and are OK with it.

Also see:
http://www.panteraclubnorcal.com/mobile/SOBill/Vacuum.html



-----Original Message-----
From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
Behalf Of Art Stephens
Sent: Tuesday, November 27, 2007 10:08 AM
To: detomaso at realbig.com
Subject: [DeTomaso] Minimum Idle Vacuum?

     I'm trying to fill out a cam questionnaire and it asks little idle
vacuum I will accept?  How the heck do I know?  I've seen numbers ranging
from 12-20 or 22 inches of mercury.  My car is a street car,  and I would
like to have it be able to idle at maybe 700-800 rpm?  Of course I want this
408 stroker Cleveland to be fast but more importantly I want low to mid
range torque and throttle response.  I see no reason to rev it over 6000
rpm.  So,  any ideas as to how much vacuum I need to operate those power
brakes?

Thanks,
Art
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