Posted by Bob Kerr on December 28, 2007 at 09:11:17 from (205.188.116.73):
In Reply to: 87 or 92 Octane Gas posted by Minnesotan H on December 27, 2007 at 19:49:50:
I have a 51 H with firecrater pistons. It doesn"t seem to care what octane is in it. I also have a 35 F-12 that is dual fuel. Kero or gas. I put it on a dyno at a tractor show a few years back and it made the same HP on kero as it did on gas! I did have to lean the mixture out when on kero so gallons per hour used was better, but not power. I Also have a 1970 Oldsmobile 442 that is an un messed with original. That car is a good example of one that needs high octane! If I put as little as 2 gallons of 87 in the tank it will knock like crazy. I also have the timing retarded a little as it really need to run on 100 octane and 93 is just barely good enough. 100 octane was the considered ethel back then and some places even had super ethel which was around 110. Anybody remember the old Sunoco 260? It was 110 octane. Boy did that ethel smell good compared to the stuff sold now! Just for a little info , in the early days before 1918 the only gas made was white gas and it was sold for home lamps (coleman type)and stoves. It was also used in cars but the oil companys figured out they could get more gallons of auto fuel from a barrel of oil than the could get from a barrel if they made the highly refined white gas. Most cars ran fine on the cheaper stuff back then. Kerosene was also used for lamps and stoves and tractors. They also started making distillate around 1918 for tractor fuel.That stuff was cheap, way cheaper than kero and was about 2-3 cents a gallon! That is the big reason farmers used it, not because of any alleged power increase.Gas about the same time was around 10 cents and kero was about 5 cents Main thing on the tractors is if it makes spark knock, go with higher octane. My H has 150 lbs compression and doesn"t need 89 or 93, I just run 87.
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