Posted by CNKS on April 02, 2011 at 10:00:03 from (216.144.104.128):
In Reply to: Re: 87 octane posted by mkirsch on April 02, 2011 at 03:33:42:
I don't call the 7.2:1 compression high. 460 operators manual says 87 octane research method or 80 octane motor method. R+M/2 = 83.5, meaning that the research rating of todays 87 octane by the R+M method is higher than that recommended by IH-The cutoff for regular gas used to be about 9:1, meaning you should use a higher octane rating. If IH 6 cylinder engines fry with today's octane rating, my guess is that something was wrong with the engines to begin with. With mine I'll never know, because I don't use it enough under heavy load. One other comment -- low octane alone is not the only thing that damages pistons. Most are probably just worn out, and some people like to blame the gas, which as far as I'm concerned is much better than it was 50 years ago.
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