[DeTomaso] Vacuum Advance - ported or full vacuum source

[Stephen Nelson]

Unless I am way out of line, wouldn't connecting to the carb port require a
vacuum advance, and going to a full vacuum source require a vacuum retard on
the distributor?

Stephen Nelson
 
-----Original Message-----
From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
Behalf Of gow2 at rc-tech.net
Sent: Monday, August 27, 2012 8:00 AM
To: dennis617 at aol.com
Cc: detomaso at realbig.com
Subject: Re: [DeTomaso] Vacuum Advance - ported or full vacuum source

It can effect your base timing which effects where you end up.




> But unless I don't understand something, that shouldn't matter since under
> open throttle the vacuum advance drops out of the equation anyway.
>
>
>
> -----Original Message-----
> From: gow2 <gow2 at rc-tech.net>
> To: dennis617 <dennis617 at aol.com>
> Cc: detomaso <detomaso at realbig.com>
> Sent: Mon, Aug 27, 2012 10:47 am
> Subject: Re: [DeTomaso] Vacuum Advance - ported or full vacuum source
>
>
> Simple answer.
>
> ith ported you have no vacuum at idle. Manifold you have vacuum at idle.
> You gain the ability to advance your timing at idle with Manifold. This
> ives you better throttle response and can help the engine run cooler.
> Switching from ported to manifold you might end up with more total timing
> hen you had which means you might need to reduce total timing.
> Gary
>
>
>>
>  Does anyone have an opinion on which source I should use for my vacuum
>  advance on my Mallory Unilite distributor, full vacuum directly from the
>  intake manifold or ported vacuum from the Holley 650 double pumper?  I
>  have a mostly stock engine with an Edlebrock Performer intake manifold.
> I
>  have recieved conflicting information from Holley and Mallory, Holley
>  claims that I should use the ported vacuum at the carb and Mallory said I
>  should use full vacuum from the intake manifold.
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