[DML] Re: Manifold Vacuum Question

["Rick" <rdevaux@xxxxxxxxx>]

Bill, Thanks for the reply.  What I have is a 1980 B28 that has been 
put into a 1978 262C.  It currently has the 004 CPR and the vacuum 
delay/retard with two ports on the distributor vacuum diaphragm.  
I've got a 038 and a 018 CPR ($10.00 new in the box,thank you UK 
EBay).  Since I have the 004 and no other full throttle enrichment, 
I'm considering putting on the 018 and wanted to hook it up to the 
correct vacuum source.  With the 2 barb distributor vacuum diaphragm, 
which barb should I hook up to manifold vacuum if I want to bypass 
the vacuum delay solenoid?  What is the purpose of the delay solenoid 
(emmisions?)and what will bypassing it affect?  I'm also looking into 
adding the full throttle enrichment switch onto the throttle pulley 
bracket and run the grounding circuit to terminal 11 of the ECU.  Do 
you think the 018 CPR and the throttle enrichment switch are over-
kill when combined?  What is the definition of ported vacuum?  Can I 
hook up the CPR to one of the vacuum ports on the intake runner?  
Thanks again for your help, Rick


so> Series 018, 029, and 038 all have much simpler full throttle
> enrichment. Full vacuum simply runs from the manifold straight to a
> barb on the top.
> 
> K Jetronic PRV's do have ported vacuum barbs under the throttle
> plates. You wouldn't want to use them for the CPR, but could run a
> line straight to the ignition distributor if you wanted to get rid 
of
> the cutoff solenoid (that's how Volvo did it, albeit with some 
unusual
> Rube Goldbergness prior to 1980 -- emissions. After 1980 it's just a
> single line straight to the distributor). If you've got both a 
Series
> 004 CPR and a vacuum cutoff solenoid on the ignition distributor, 
your
> engine must be 1979 (or at least it's configured that way). Of 
course
> 1979 is B27, not B28....
> 
> Bill Robertson
> #5939
> 
> >--- In dmcnews@xxxxxxxxxxxxxxx, "Rick" <rdevaux@xxxx> wrote:
> > I'm trying to learn a little about manifold vacuum on the B28 
engine.  
> > I currently have a warm up regulator that doesn't have a vacuum 
> > enrichment on my engine.  If I add a CPR that has vacuum 
enrichment, 
> > where on the intake manifold should I hook the vacuum tubing 
going to 
> > the CPR?  Can I tee into the vacuum line that is taken off of the 
rear 
> > of the passenger's side intake runner (currently goes to 
distributor 
> > retard solenoid)?  What's the difference between ported vacuum 
and 
> > manifold vacuum?  Thanks, Rick D







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