Yes. If it didn't, you're motor wouldn't accelerate. It needs air to make
power. Air is the opposit of vaccumm. When the vacuum stabilizes as
cruising, that's the motor "coming to equilibrium" with the ambient air
pressures and forces acting AGAINST the truck going forward.
>From: JAMEPC@aol.com
>Reply-To: dakota-truck@dakota-truck.net
>To: aol@dakota-truck.net
>Subject: DML: Vacuum Question
>Date: Fri, 30 May 2003 22:43:58 EDT
>
>I check my vacuum and I have 12.2 "- 13.1" at idle (lumpy cam) and under
>light acceleration, it drops down into the single digits (5" - 8") and
>finally
>starts to hold steady at cruising speed. Is it normal for it to drop like
>that?
>Thanks,
>James
>
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