RE: [DML] Tuning Idle Speed Circuit. (was: Re: idle problem)

["John Hervey" <john@xxxx>]

Martin, Slight correction. Our WUR are equipped with a dual spring set up.
When the throttle valve is open further at full load, the pressure in the
intake manifold increases, the diaphragm leaves the upper stops and is
pressed against the lower stops. The inner spring is relived of tension and
the control pressure reduced then you have more mixture enrichment. In other
words, when you put the peddle to the floor the WUR / CPR enrich the fuel
system along with the Full throttle switch which then activates the FV.It's
hard to have one without the other.To the best of my knowledge the delay
valve has a 1 sec. delay. In a Porsche, a fuel filter is used to reduce the
fast inrush of vacuum when dealing with the turbos.
My 2 Cents
John Hervey


-----Original Message-----
From: Martin Gutkowski [mailto:webmaster@xxxx]
Sent: Thursday, September 11, 2003 8:57 AM
To: dmcnews@xxxxxxxxxxxxxxx
Subject: Re: [DML] Tuning Idle Speed Circuit. (was: Re: idle problem)


The vacuum enrichment on the DeLorean's CPR is only active under warm-up
conditions, at which time the distributor vacuum is disconnected. As the
CPR vac is removed, it is placed on the distributor (so to speak).

Martin

Harold McElraft wrote:

>I just read carefully the note you attached. The delay valve is in
>fact in a reversed condition than that called for in the D when used
>in a spark delay setup because the spark advance needs slowed down
>some to eliminate "ping". The "Carb" side in that case is attached
>to venturi vacuum which increases with throttle. The D setup is
>attached to manifold vacuum that decreases with throttle. The delay
>effect in the D is a bleed-down where the spark setup calls for a
>delay in applied vacuum.
>
>Harold McElraft - 3354
>
>
>





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