[DML] Re: delorean fuel (Bruce B)

["David Teitelbaum" <jtrealty@xxxxxxxxxxx>]

The mechanical advance has 2 weights in it. They are different and
only one has a spring. They BOTH work, it is just the one with the
spring comes in a little later. It gives a "knee" to the advance
curve. Also take notice that on the distributer cap the cylinders are
not spaced equally apart. This has the effect of varying the advance
for certain cylinders. It is very important that you wire the cap
exactly to the cylinders as marked on the cap so as to maintain the
correct timing for each cylinder. Base timing is mainly there for ease
of starting and to minimize emmisions at idle. If you look at the
advance curve (mechanical AND vacuum) you will see it advances quickly
like most internal combustion engines. For best power and economy you
want to try to get as much advance in as quickly as you can. That is
of course up to the point BEFORE you get pinging! The problem is that
for production motors all of this tends to be on the conservative side
so that there is plenty of room to "cheat" and if you want to maximize
things you could probably add even more advance. Going with a higher
octane fuel will allow even more advance. If you do try this remember
you are flirting with disaster. You can burn valves and pistons if you
overdo this. In any case more advance is usually better than less. If
your mechanical or vacuum advance systems are not functioning you will
have poor fuel economy and low power. This is why going to a full
engine managment system is so neat. You can change things like base
timing and advance "on the fly" from the passanger's seat. Add a knock
sensor and the system can run you right up to the edge for maximum
performance without the danger of damaging the motor! This is the
ticket for any serious performance gains.
David Teitelbaum
vin 10757


--- In dmcnews@xxxxxxxxxxxxxxx, "content22207" <brobertson@xxxx> wrote:
> 
> 
> Slight clarification:
> 
> 13 degree BTDC base time is due to the hobbled DeLorean ignition
> distributor (one centrifugal counter weight disabled), not PRV engine
> design. Exact same engine (B28F) is base timed at 10 degrees in a
> Volvo. DeLorean has a flatter advance curve, which requires moving all
> sparks closer to cylinder bottom.
> 
> I'm guessing DMC did this for emissions. North American Volvo's used
> 








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