Re: 460 87 or 93 Octain

Posted by ChadS on April 15, 2005 at 08:26:52 from (4.224.132.210):

In Reply to: Re: 460 87 or 93 Octain posted by the tractor vet on April 15, 2005 at 07:47:03:

Vet, Im gonna have to back you up on this post! I have a camerea, and I still have the pistons out of the 706 I rebuilt, and they were BEATEN to death from detonation/preigntion from the wrong octane fuel in it. I cant explain any other means for why they would be that way. Looks like they were torched. IH engines,, from what ive learned ove the years of turning wrenches on em,,, they were a bit more High performance than what they said they were. I also belive alnong with your piston theory, the head causes alot of problems too. Gotta remember,, the original 6 cyls engines, were based off the truck engines,, which were high rpm engines. you can disapate heat faster in higher rpm situations,, BUT, drop the rpms in half,, like they did on the 460-806,, and you have an engine working way to hard,, for what it was designed for. That, creates extra strain on everything internally in the engine. you try working a 460 ford, that can rev up to 5000 rpms, and drop it back to 2000, see how much problems youd have trying to work that engine hard,,, youll blow it up faster, than if you revved it up to 6500!!!! Engine design, is the hindering factor for destruction for the IH 6 cyl. heads, and pistons wee the breaking parts, in them, just like you said,, heat, too low of octane for the CYL HEAD and PISTON design= rebuild prematurely. Id say on the short stroked 460,, you mite get away with lower octane, but not for long,,, Chad

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