Listers,
Several years ago I was fighting engine knock in my BJ8. The engine
now has 120,000 miles on it and never been rebuilt. The compression
now averages about 158 psi for all six cylinders. I tried every
octane booster and pump gas cocktail I could find, all to no avail. I
adjusted timing and did everything I could think of to stop it.
Finally, one of the local racing shops suggested trying a mixture of
leaded racing gas and pump gas. I was given a nomogram by which one
could select a desired octane rating and thereby determine the ration
of race to pump gas. To obtain a calculated 97 octane I have used one
(1) gallon of 110 rated leaded race fuel to six (6) gallons of pump
gas. I have been running my Healey on this fuel mix for about fifteen
years. Is it a little expensive? Yes. Does my engine ever knock or
ping? No, never unless I back off of this mixture. Does my engine
run on (diesel) and require dragging the clutch while in gear during
shut down? Never. At the outset of using this formula I conducted a
complete engine tuning. I checked the carburettors adjustment with a
Colortune. and set the burn to a very slight richness. My Healey runs
very smoothly and sounds fantastic. Finding a source of leaded racing
fuel is a bit of a challenge. I have found that a local motorcycle
repair shop is the best source of race gas.
Marks3
'66 BJ8
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