[DML] Re: Timing procedure

["content22207" <brobertson@xxxxxxxxxxxx>]

Your vacuum advance solenoid is not operating properly. There should
be no advance at idle.

In the DeLo setup, vacuum advance is either full on or full off.
Solenoid cuts off vacuum at idle, then shoots 100% as soon as the
throttle plates open (idle speed microswitch opens).

I much prefer Volvo and Renault's PRV setup -- spark advance is taken
from traditional ported vacuum nipples under the throttle plates.
Shoots vacuum progressively as they open. 

Plus there's no solenoid to malfunction, as yours obviously has.

Delay valve is for Series 066 CPR full throttle fuel enrichment --
another complicated setup that early imported Volvos (Series 004 CPR)
and European PRV's (Series 038 CPR) avoid with a simple plate
connected directly to manifold vacuum. Later imported Volvos used
Series 066 CPR as well.

Bill Robertson
#5939

>--- In dmcnews@xxxxxxxxxxxxxxx, "Jeff Phillips" <jeff.phillips@xxxx>
wrote:
> Having looked through the archives I've still a question on the 
> correct timing procedure. Just so I'm sure, although the manual 
> doesn't say to, you should disconnect the vacuum advance and also 
> block off the disconnected hose correct?  Everything timed out great 
> when I did this, and the mechanical and vacuum advances advanced per 
> the specs in the manual however when I reconnected the vacuum advance 
> line the timing gets pretty far advanced and it doesn't run as 
> smootly when it was blocked.  
> The timing at idle is about 30' when all of the vacuum lines are 
> connected, does this seem in the ballpark?  
> 
> How critical is the the delay valve as mine beeds down in around 3-
> 4secs instead of the 10 per the manual?  
> 
> Is there a way to test the vacuum solenoid as far as when it should 
> open, I really don't know what the function of the vacuum solenoid is.
> 
> Jeff Phillips
> #10544




To address comments privately to the moderating team, please address:
moderators@xxxxxxxxxxx

For more info on the list, tech articles, cars for sale see www.dmcnews.com

To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews 
Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/dmcnews/

<*> To unsubscribe from this group, send an email to:
    dmcnews-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/