Posted by jdemaris on December 06, 2014 at 06:48:02 from (70.194.7.6):
In Reply to: Gas Tractors posted by prawn farmer on December 05, 2014 at 06:14:52:
Back on the subject of the Oliver 1800. It holds the record for being the most efficient gas tractor ever tested at the Nebraska Test Institute. They did it with high compression which is the key to the high efficiency and often avoided in farm tractor engines. Oliver did it with the 1800 by using 8.5 to 1 compression ratio, while most other tractors were running 6 to 1, or 7 to 1.
Oliver did a lot of research with high compression gas engines and that XO-121 had 12 to 1 compression. Never made production though and was built from a diesel engine block as I recall.
The 1800 DID make production and I think it's the highest compression ratio ever used in a farm tractor. Nebraska Test Institute used 92 octane gas during the tests - I assume to keep piston detonation down.
I tried putting high-altitude pistons in a John Deere 2020 and running it at 1000 feet- in an attempt to copy what Oliver did. It did NOT work. It had horrible detonation even with high-test gas and could not be worked hard.
To Mr. Buick/Deere. You can argue the bad aspects of overall tractor design with the 1010/2010 series. The engines were not all that bad though. There's nothing that's "higher tech" in Deere gas engines later on that made the combustion chambers more efficient. E.g. the 1020, 2020, 3020, or 4020 gassers.
In fact, the 1010/2010 engines had several "firsts" for Deere and the tractor industry. Positive-seal teflon valve-stem seals. Diesels were the first to use Stanadyne rotary fuel-injection pumps, etc. Also the first Deere full-size engines to use a wet-sleeve system.
In regard to you maybe thinking the 2-cylinder tractors would of been more efficient if the main jets had been trimmed down? Guess you could say the same for any gas tractor tested.
The fact remains that Oliver somehow built an engine that could be worked hard even with a high compression ratio. There is not a John Deere two-cylinder gas tractor that even comes close. Deere 520 comes the closest at 11.46 horsepower-hours-per-gallon. John Deere 2010 beats that with 11.79 horsepower-hours-per-gallon. Oliver 1800 beats them all with 13.1 horsepower-hours-per-gallon.
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