re: "With the poor quality of todays fuel ..."
What quality issues are we having with today's fuel? Many modern
cars--'family' sedans, even--will do 150MPH and 0-60
in six seconds or less on 'pump' gas. I just put 3,773 miles on my BJ8 over 6
states on pump gas--granted, my car is
not high-compression; nominal at best--with no fuel-related issue. I generally
buy the 'name' brands--Chevron, Shell,
etc.--but will buy no-name gas if necessary.
AFAIK, the octane-rating tests--motor ('M') and research ('R'); the US uses the
average of the two--haven't changed in
decades, if ever, so today's 91-octane gas has the same anti-detonation quality
as 91-octane gas from 1950. Many, if
not all, gas stations have had to replace their underground tanks to prevent
leakage into the environment; the
side-effect being there shouldn't be much 50-year-old crud and water sitting on
the bottom. It's only anecdotal, but I
put pump gas--probably containing ethanol--into an unlined steel can for my
lawnmower and have had it sit for 3 years or
more with no visible deterioration of the can or the gas (and the mower still
runs fine on it).
Not heckling here; I'd just like to know what fuel quality-related issues
people are having--I haven't heard of any (the
carping about alcohol is another issue--I'm not a fan of the fuel or the
political policy, but I haven't had any trouble
with it). Now, if the issue is 95-octane ((R+M)/2) gas isn't available at the
pump any more; well that's not a quality
but a supply&demand or maybe a cost issue (you can get 100-octane avgas at some
stations in the southwest if you're
willing to pay $6+/gal).
Bob
On 6/5/2013 11:48 PM, Derek Job wrote:
> John
>
> With the poor quality of todays fuel I think that 35 degrees advance is too
> much for a road car. To answer one of your questions, that would be the
> total advance when the mechanical advance is fully operational. The vacuum
> advance is a fuel economy measure and only operates when the throttle is
> slightly open.
>
> Derek
>
>
>
--
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Bob Spidell San Jose, CA bspidell@comcast.net
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