It can be done, and how well it works depends on the engine and how well you engineer the conversion. I still farm with a pair of Oliver tractors (1950T and 2150) that I bought cheap with very low hours do to the unreliable factory diesel engines. I replaced the blown up diesels with propane burning 454 Chevrolet engines. Summer fill propane was 25 cents a gallon 30 years ago when I built these tractors. I built adapter plates, fitted the tractor flywheels and clutches to the chevrolet engines. I fitted the 454 engines with small chamber 366 heads for high compression for efficient use of propane, fitted 8 qt truck oil pans and custom ground camshafts for maximum torque at low tractor rpms.(2400 max) Propane fuel systems are simple reliable IMPCO parts. At the time, total conversion cost was about $1000 per tractor, a fraction of what it would cost to replace the factory diesels that were so unreliable. These tractors have been trouble free for all those years, only exception is the 454 will need $100 worth of new pushrods and rocker arms at around 6000 hours. Quite a few tractors, combines, swathers came with factory installed automotive engines.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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