Re: 93 octane?

Posted by John T on October 29, 2007 at 07:45:27 from (66.244.83.147):

In Reply to: 93 octane? posted by ggg7lazy77 on October 28, 2007 at 22:48:44:

Higher octane gas is refined purposely to be harder to ignite to reduce pre ignition spark knock in higher compression engines. In low compression engines (like old tractors) Theres no need or sense in using any higher octane then necessary cuz it may even leave more unburned n potentially harmful fouling deposits then the easier to ignite regular 87 octane.

As far a valve life, the lead in the old leaded gasoline helped reduce valve face n seat recession as it provided some degree of lubrication and cushioning of all the constant valve face to seat impacts, however, hardned seats has helped reduce that problem.

DONT RUN ANY HIGHER OCTANE THEN NECESSARY to stop pre ignition spark knock and unless an old tractor has had its compression raised significantly 87 should be fine.

Fer as I know its the lead or lack thereof (or substitutes) instead of the octane thats a valve saver.

John T

Replies:

• Re: 93 octane? the tractor vet 07:48:21 10/29/07 (0)

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