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.
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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