Re: [DML] Clarification: DeLorean Spark Advance
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Re: [DML] Clarification: DeLorean Spark Advance

My spark advance runs from a ported barb on the side of my carburetor
-- exact same concept as the barbs under K-Jet throttle plates. One
hose is all it takes.

The 3/8" brass barb on my intake manifold powers HVAC ducting and the
heater core shutoff valve (that's why it is pointed sideways towards
the driver's pontoon -- disappears straight into it). I reused DMC's
check valve.

I don't have a charcoal canister.

PCV goes into the side of the carb (I eventually made an inline
adapter from a calibrated nipple. I think the pictures in #5939's
photo album show the PCV valve I stuck inline just to get to Pigeon

If you really want to do some experimenting, contact me off list
( I have a european fuel distributor
(ALUMINUM, not cast iron, with internally fed lower chambers) and
Series 38 CPR that need to be sold to someone. Should be good for
hours of amusement. Rich Acuti still has my ignition distributor
(actually Rich has 3 of my distributors: 1 Renault and 2 Volvo). I'll
let him keep one, but the others need to come back. Anyone heard from
Rich lately? I stopped by his house at the beginning of the summer but
he wasn't home. The Delo was, however, with current tags.

Another owner mentioned difficulty with a B27F distributor. I can't
readily find vacuum advance specs for it in my literature, but my hose
diagrams indicate a "vacuum amplifier" for B27F 1976-1978. Perhaps
that had something to do with his difficulties (different diaphragm?).
No such device is indicated for B28F. Ford got a little crazy with
vacuum advance diaphragms in the late 70's, ultimately going to a
bizarre design with barbs on BOTH sides of the rubber (Rube Goldberg
plumbing routed vacuum accordingly), so perhaps Volvo was up to the
same. Swapping vacuum diaphragms is super easy *IF* the mounting
screws aren't frozen, so you could throw your DMC diaphragm on a Volvo
distributor if necessary.

Of course you need to ensure that any vacuum advance diaphragm doesn't
have a hole in it. They do go bad.

It would be interesting to see what an owner can cook up in his own
driveway simply using other PRV components. Wouldn't be Stage II of
course, but cost would be MUCH lower. Most of the components are
available NOS on eBay (I've picked up CPR's and ignition distributors
there, at rock bottom prices). Just remember that not all CPR's have
vacuum enrichment. If the CPR has a vent looking port, but isn't a
Series 066, it has full vacuum enrichment (or more precisely full
vacuum leanment -- manifold vacuum pulls it lean. Simply run one hose
from a manifold vacuum port directly to it).

Bill Robertson

>--- In dmcnews@xxxxxxxxxxxxxxx, "Steel Wings" <steelwings@...> wrote:
> Bill,
> Could you provide us with a little more detail on your modification?
I would definitely like to try that here. Especially as my 1981 car is
exempt from Massachusetts emissions inspection.
> Thanks,
> Steelwings,
> 1559

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