Posted by CoopertownBob on September 15, 2010 at 17:44:09 from (74.51.5.129):
In Reply to: Octane in Super H? posted by Jim Becker on September 15, 2010 at 16:09:39:
Quoting Removed, click Modern View to see
According to the original owners manual for my 1940 H, on page 15 under the heading of, "GASOLINE OPERATION FOR HIGH COMPRESSION ENGINE", it has the following. "This engine is designed to operate on gasoline with a minimum of 70-72 Octane rating." Mine has the special 8,000 ft altitude piston set in it, with a later, Super H model gas head that was dealer installed in the 1950's when the engine was converted from distillate to gasoline, and I never have knock or run-on issues running the cheap stuff in it, but I do pull the head every two years or so and chip all the carbon out of it. Since I have grown tired of this routine, after the last time I have started running Shell System 3 gasoline exclusively to see if it makes any difference, still the lowest octane stuff though. Just for extra info, the same owner's manual says the distillate engine calls for only 38-40 octane. The Super H came factory with something like 7.1 to 1 compression ratio if I remember right, so the cheap stuff in it should not cause any trouble either. If it does, according to my owner's manual again, it may need the head removed and the excess carbon cleaned from the chamber and the top of the piston.
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