<VV> Effect of Reduced Quench on Jet Size and Timimg

[BobHelt at aol.com]

In a message dated 8/17/05 11:13:56 AM US Mountain Standard Time, 
Mikeamauro at aol.com writes:

> Question: 
> does the more homogeneous mixture, due to the now tight quench height and 
> related turbulence, make higher A-F ratios possible? Also, because of the 
> more 
> compact combustion chamber, cannot/should not the ignition timing be backed 
> off 
> somewhat from stock? Thanks in advance for any opinions given.
> Mike Mauro
> 
Hi Mike,
You could experiment with smaller jets, but be aware that the A/F varies 
considerably from cylinder to cylinder. This is why the engineers ran things on 
the rich side. In fact, I'd look to some other factors to improve gas mileage.  
Carb synchronization, tire pressures, axle ratio, spark advance timing, stuff 
like that. Is yours the correct distributor?  Check you coast-down times to 
see what your rolling friction is. Your timing is already advanced by 4 degrees 
(14 is stock) . I'd suggest backing it off a degree or so from stock because 
of the compact chamber. Maybe that would allow you to run a lower octane gas.
Regards,
Bob Helt