Re: [DML] What gas octain to use

[Warren Wallingford <warren@xxxxxxxxxx>]

If you have a stock Delorean and are running the stock 12-13 degrees 
initial advance, 87 octane is what you should use.  If anything has been 
done to increase the cylinder pressure, i.e., timing advance, more 
freely flowing intake, higher compression, or supercharging, then higher 
octane is called for to eliminate detonation.  There is no more energy, 
(heat value), in higher octane gasoline.  It is just more resistant to 
pre-ignition.

I have always put regular fuel in stock Ds that I drove.  It's cheaper 
and works just as well as anything that costs more.  I put hi-test in 
cars equipped with our Performance engine and any turbo equipped cars I 
happen to be stuck in.

By the way, beware of fuel that has a high ethanol content-gasohol or 
E85 or such.  Alcohol is extremely hard on rubber compounds in fuel 
systems.  Long years ago, one customer used a gasahol blend sold at an 
independent station near his home.  It was 90-something octane and cost 
as much as regular.  He brought his car in with symptoms that led us to 
the tank.  We found that his pump boot had swollen by 20%.  It looked 
like an outsize display model of the stock one-printing and all.  We 
replaced it, shook our finger at him, and sent him away.  The boot 
shrank back a little, but never re-assumed its original size.  I've seen 
pick-up hoses swollen into parodies of themselves.  So far as I know, 
the ethonol-derived ether oxidizers used in modern US gasolines don't 
have this effect.

Warren Wallingford
DeLorean Motor Company (Texas)
15023 Eddie Drive
Humble, Texas 77396 USA

http://www.delorean.com
800/USA-DMC1
281/441-2537
281/441-2813 Fax

mike_fm2002 wrote:
> 
> 
> What octain level of gas should I be using, 87, 89 or 91?  Will the 
> engine run better at higher octains, or am I damaging anything by 
> using one over the other.  Thanks, Paul





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