[DML] Various Files Uploaded
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[DML] Various Files Uploaded



I've just uploaded some PRV literature from other sources (Volvo &
Renault) to a folder titled "Other PRV Literature" in the Files section:

B28F_Vacuum_Lines.JPG - Note that the ignition distributor uses ported
vacuum rather than DMC's manifold vacuum setup.

Series038_CPR.JPG - These are the simpler internal workings of a
Series 038 CPR. Note that what most Delo owners know as a vent is a
vacuum nipple in this application (manifold vacuum pulls the diaphragm
lean until the throttle plates open).

Series038_Series066_CPR.JPG - These are specs for two of the more
common CPRs. Note that Series 038 takes longer to warm up (runs richer
longer), but final control pressure is identical to Series 066. Full
load enrichment plumbing is much simpler (one 1/4" line directly to
the intake manifold).

Volvo_Oil_Specification.JPG - This is a reprint of the 4/84 TSB
reducing recommended oil viscosity. 10W40 was indeed recommended in
1981, but later camshaft wear problems (yes, B28's suffer the same
accelerated wear as B27 -- "softer metal" is an old wives tale that
keeps resurfacing in Delo newsgroups but is NEVER mentioned in Volvo
newsgroups. Go figure) prompted Volvo to lower the viscosity spec to
10W30. Note that Volvo made this recommendation retroactive to
"earlier models" -- certainly including our circa 1981 B28's. 

BTW: A major cause of accelerated camshaft wear is the automatic
timing chain tensioner. As its piston moves out, more & more oil drops
back into the pan via the timing chains rather than the valve train --
a design flaw that probably has no solution.

Volvo_Idle_Modification - This is a fun one! The shear head idle
screws are somwhat sacrosanct in the Delo community (woe to the owner
who suggests turning them -- I've been on the sharp end of that stick
many times). At some point before 1985 Volvo itself decided that if
you can't get the engine to idle right, they should be drilled out and
good old fashioned screws inserted in their place. Note that this
tuning procedure is done IN ADDITION to CIS, not instead of it. Note
also that Volvo's idle spec is ~900 RPM, not Delorean's 775 (did DMC
have to dial it back for their overly restrictive exhaust system?
Anyway, now you know one reason why so many owners have idle issues).
I've uploaded a file (Screws.JPG) that explains the real purpose
behind those shear head screws -- US emissions laws, not engine
performance.

I've also uploaded a wiring schematic of my modified exterior lighting
circuit to #5939's photo album (it isn't PRV related, so I put it over
there). Realized too late that I forgot to scan modified wiring inside
the vehicle -- I'll do that ASAP and upload it as well. Basically this
is for the benefit of owners who want blinking side lights. You may
also notice that I've swapped positions of my tail and brake lights. I
think stock Deloreans look stupid at night with only two puny tail
lights illuminated (every person has a right to his or her opinion). 
This was the quickest and easiest remedy. Rather than risk snapping
tabs inside the original wiring harness connectors I simply cut the
wires. A very wide 3rd brake light has been added to the back window
(12" or 14"), so there's no safety issue with the single brake lights.
At least North Carolina safety inspection doesn't think there is an
issue. I haven't been rear ended yet....

Bill Robertson
#5939




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