Re: [DML] DeLorean vs Volvo F Series Question
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Re: [DML] DeLorean vs Volvo F Series Question

"As we all know"? Bill, you expect too much from some of us ;-)

Judging from the way the tech manual is written, it looks to me like
they were very concerned with U-S emission controls. A lot of the
sentences contain language like "thus reducing hydrocarbon emissions"
... *shrug*

Of course, it's entirely possible that they "over-built" things
because of worry or some other reason. I'd guess that it's a matter of
opinion. I would probably appreciate making things simpler, but that's
probably because I'm not a skilled mechanic! I think I have to
understand *why* something works (or doesn't) before I go about
fiddling with it. Obviously you know what you're doing. For the most
part, I don't. :P But I also would like more information on this,
please! Come on, group! It's not Mardi Gras everywhere, is it? ;-)

Farrar Hudkins

On 2/5/08, content22207 <brobertson@xxxxxxxxxxxx> wrote:
> I am corresponding with an owner Re: spark advance. As we all know,
> DMC decided to use only one centrifugal counterweight inside its
> distributors rather than two (Volvo used two on its imports to the
> exact same North American market). To compensate, DMC:
> - Bumped base ignition time from 10 to 13 degrees BTDC
> - Ran full manifold vacuum rather than ported vacuum to the advance
> diaphragm
> This oOf course leads to generally overadvanced ignition, so for
> better starting and cold engine performance DMC further:
> - Ran its vacuum through a thermactor valve and an idle cutoff
> solenoid before the distributor
> My question: Why did DMC find it necessary to reinvent the spark
> advance wheel?
> B28F has two centrifugal counterweights, 10 degree base ignition time
> (steeper advance curve), and only one vacuum line from a ported barb
> under the throttle plates directly to the advance diaphragm. What
> could be simpler?
> And again: Volvo imported its setup into the exact same North American
> markets, during the exact same time period (1981-1983). If their setup
> was good enough for the US government, shouldn't DMC have been able to
> use it too?
> BTW: US Volvos also came with a Y pipe and single catalytic converter.
> They used Lambda as well.
> More engineering from Dunmurry that causes me to scratch my head.

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