Define "efficiency." In the context of a tractor intended for work - it is about the cheapest cost per horsepower-hours. Increasing compression to get slightly more work per gallon is not a gain if more expensive fuel must be used. If durability and longevity is lowered, then also no net gain.
I suspect there is little you can do to improve what Deere already spent a lot of time on - unless you plan to redesign the engine.
Oliver might still hold the record for efficiency in a gas tractor since they managed to use 8.5 - 1 compression and run regular gas. Quite a trick with no advanced electronics. Oliver 1800 beat many diesels with work done per gallon of fuel.
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Today's Featured Article - My Ford Golden Jubilee - by Troy Estes. This article is about my '53 Ford Jubilee and a story that starts with taking the tractor to my brother's Starter/Alternator Rebuilding shop for a wiring fix. The generator was shot as well as all the wiring. I dropped off the tractor expecting a transformation from a 6 volt to a 12 volt system utilizing the original generator housing, and a total rewiring of the whole tractor. The front end center pin bushing was worn also so I ask that they replace it if they had time. Well, that’s wha
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