When my computer came back from computer hospital it no longer had the
info from Union Oil in it, or I would forward it. As I recall, their 110
product has 4.0 g/Gal of TEL. Most of the leaded race fuels have near the
same amounts per gallon. My understanding is that very little TEL makes a
fairly significant increase in octane and you can't raise octane much
more even with large quantities of TEL. Most of the octane of a
particular fuel is the result of the refining process and the base stock.
At 4.0 g/Gal, there is more lead than needed to achieve the 110 octane
rating but is there more for its lubricating properties for the valves in
the very high pressure environment.
Have been mixing race fuel 1:1 for years with good results. I was shocked
when 1:10 was suggested, but he insisted it would still provide a high
enough octane.
A local engine builder with engine and chassis dyno facilities has proven
that any given engine only needs so much octane, and more will actually
reduce power output. There seems to be a lot of racers who are dedicated
to spending as much as possible for race fuel. There is a CO-OP north of
Denver that sells Union Oil 110 for $3.75/Gal at last check and it is
even less if you join the CO-OP. Meanwhile, others are paying $4.50 to
$5.00/Gal from other sources and show no interest in saving money.
I'm not sure how much premium unleaded fuel octane is increased by the
addition of a little TEL, but at 1:1 you would have 2.0 g/Gal which is
still more lead as I recall than leaded fuel had at the pump before it
was banned. With hard valve seats that should be more than enough. At
1:10 TEL would be 0.36 g/Gal. Not much for lubrication but should still
affect octane. Don't think I would dilute that far, but why not save a
little to spend on tyres, or something.
Bill
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