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Letter Re: Running Chainsaws on Ethanol & Home Alcohol Production Stills
Sir:
About your
comments [on Thursday] and others in regard to kerosene use in a
gasoline engine: From anything I've experienced, you are correct about it
not being
as simple
as some have posted. Engines that were built for "all fuel" use -
including distillate and kerosene, had very low compression ratios - usually
around 5 to 1. Low compression makes a low-power, inefficient engine. The carburetors
were jetted differently, a twin fuel tank setup used, a selector-valve installed
for quick fuel changeover, and a closeable air-shutter on the radiator to keep
the engine hot. You started the engine on gasoline, got it good and hot, then
slowly switched over to kerosene. When it came time to shut the engine off,
you had to switch back to gasoline first -otherwise once cool, it would not
start again.
Modern automotive gasoline engines with computer controls can be anywhere from
9-to-1 to a 11-to-1 compression-ratio. Older automotive engines, if not made
to run on "high test" tended to be in the 8 or 9 to 1 range. Modern
heavy-duty industrial use gasoline engines - and other off-road equipment -
including
lawn-mowers and such, tend to run a compression ratio of 8.5 to 1 which is
too high for kerosene use.
I was a John Deere tractor mechanic in the 1960s/70s and used to work on a
lot of "all fuel tractors." Deere and other companies made them up
to the late 1950s. We usually converted them to higher compression ratios to
run
on straight gasoline. This way, they made more power and ran more efficiently.
In fact, we sometimes took standard gasoline tractors - and installed "high
altitude" pistons to make them even more powerful. There are still a few
all-fuelers around being used - including the two I own. My 1937 Deere [Model]
BO still has the original all-fuel parts including the radiator shutters. I
have
to
get it really hot before I dare switch it over to kerosene. And, after working
it - if I park it with the engine idling and still hooked on kerosene - it
will cool down, start backfiring and eventually die - unless I either get it
hot again - or switch over to gasoline.
Just to show the power difference, a
1956 John Deere 720 all-fuel tractor with a 360 cubic inch engine put out a
max. horsepower of 42 horsepower. Same engine
and tractor in the gasoline-only version put out a max. of 55 horsepower and
ran 20% more efficiently. Same tractor in diesel version put out a max. horsepower
of 56 and ran twice as efficiently as the all-fuel version. Seems using diesel
power is a no-brainer. If you have some kerosene in reserve, stick it in a
diesel. - John from Central New York
