What compression-ratio do you have now? Highest CR ever used sucessfully in a production gas tractor was Oliver, I think that was 8.5 to 1. Oliver still holds the worlds-record for fuel efficiency in a gas tractor.
We tried putting 8.5 in several John Deere tractors and it was awful. Even with the highestr octane gas we could buy, and retarding the timing, the pistons still suffered from detonation under a heavy load. With Deere, all you had to do was intall the high-altitude kit in a tractor NOT run in high-altitude - to get high compression and quickly ruin the engine.
Other then the record-breaking Olivers, 8 to 1 seems to be the high barely-safe limit for a gas tractor that gets worked.
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Today's Featured Article - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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