Re: [DML] Fuel Octane

["content22207" <brobertson@xxxx>]

In 1970's car companies tortured existing technology to meet ever
tightening government mandates. First to go of course was high
compression. Then they started moving spark closer to bottom of stroke
(for additional burn in the cylinder). Take my 460's for example: 1969
were timed 10 degrees (also 11:1), 1977 were timed 17 degrees, 1978
were timed 20 degrees. Engine couldn't be dumbed down any further and
was dropped from all consumer autos (not trucks) after that.

According to Martin G's PRV buddy, on their side of pond R30 (my
block) is timed 10 degrees with catalytic converter, 6 degrees without
(please don't open catalytic converter can of worms AGAIN). 6 degrees
seems awfully close for my tastes, so I used 10 as a familiar medium.
May one day experiment with 8 (zero problems with "anything"
clattering now). And since upstroke isn't fighting explosion, surely
get an extra pony or two. 

BTW: does anyone know stock coil voltage? My 40,000 volts would jump
up to .05 no sweat on a cast block. If aluminum conducts OK might be
fun to try same on D, especially timed close to 6 degrees BTC. I do
need SOMETHING to burn.

Bill Robertson
#5939, grounded until I get my right arm back...

I'm
> a bit curious though why you're running the spark retarded 3
degrees. The
> DeLorean spec calls for 13 degrees advanced and 10 is 3 degrees
closer to
> top dead center. With 89 octane fuel and your hotter ignition system
why not try
> advancing to 15 degrees and see if you notice any pinging. If not,
you'll
> see a bit less fuel consumption and maybe a bit more power. As
seasonal temps go up you may begin to experiance some pre-detonation
though so it's a "play it by ear" thing.
> 
> Bruce Benson