Re: [DML] R30 PRV Timed 10 degrees

["content22207" <brobertson@xxxx>]

You misunderstood: I said I was retarded (hmm, why doesn't that sound
right?), not DMC. Stock DeLorean is ALWAYS advanced more than me -- 13
degrees at idle (I idle about 10 because so little vacuum before
throttle plates. No real effect then so I could probably time with
diaphragm connected. And no, diaphragm doesn't have a hole because I
can suck rotor manually). Jumps close to 30 as soon as solenoid kicks
off. That's why DeLo CPR has vacuum chambers. Need to enrich mess out
of mixture the second those plates crack (talk about predetonation!).
My advance is gradual in sync with throttle plates, maxes around 20-25
degrees.

Stock DMC timing MUST cut into performance. Piston spends a lot more
time pushing against explosion than I do. Even though my displacement
is 11% smaller, have no trouble keeping up.

One of the tricks domestic manufacturers used in late '70's to please
government was increasing spark advance. Yields longer burn time in
cylinder, at expense of horsepower. 1977 460 is stickered 17 degrees,
1978 is stickered 20 degrees. Have moved mine 10-15 (don't fully trust
harmonic balancers after 100,000 miles so my final time set by ear).

Bill Robertson
#5939

>--- In dmcnews@xxxxxxxxxxxxxxx, Martin Gutkowski <webmaster@xxxx> wrote:
> Was talking to Darren earlier and the timing is not "retarded" but 
> over-advanced in a stock DMC at idle to clean up the emissions. The vac 
> solenoid thatcuts off the advance means that on a Ren engine, timing 
> should be set up with the vac disconnected. In reality it doesn't
make a 
> lot of difference.
> 
> Busy playing with timing on a right-hander with Volvo ignition, finding 
> its "sweet spot" around 8-9 degrees at idle.
> 
> Martin
> 
> content22207 wrote:
> 
> >According to Martin Gutkowski's PRV buddy, my R30 PRV (Renault) should
> >be timed 10 degrees. I've tried it at 13, but performance suffers.
> >Slightly retarded (by DMC standards) timing and a 40,000 volt spark
> >give me a pretty good jump off the line, even though displacement is
> >only 2.5 liters. 
> >
> > 
> >