Posted by John T on June 28, 2011 at 05:55:57 from (173.243.189.183):
In Reply to: octane on Farmall H posted by farmallH on June 27, 2011 at 19:10:17:
Unless its been drastically modified with high compression RUN 87 OCTANE.... Those old tractors have relatively LOW compression and certainly DO NOT require purposely more difficult to initiate high octane fuel in order to prevent pre ignition spark knock. Heck they could run on distillate or drip fuel which is extremely low octane if they were equipped with hot manifolds and dual fuel capable carbs.
If an engine has high compression THEN HIGH OCTANE IS REQUIRED to prevent pre ignition spark knock as it doesnt initiate quite so easy/fast but in that low compression engine you certainly DO NOT NEED OR WANT purposely designed hard to initiate high octane gas.
Thats my story n Ima stickin to it....but its your tractor and you can run 105 if you like
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