115-120 HP on a stock fresh 4020 is not uncommon,,and the exhaust temp, is not dangerously high ether, as far as turning the pump up on a 4020, about all you can do is tighten the leaf spring screw, and it will only give you a bit,,10%..If the timing is advanced by about 10 degrees it will also help,,,when you hear a 4020 "rattle" a bit on the rev up,,it is feeling good and will be in the higher HP range,,adding a turbo will put it into the 130-104 range,, a lot of them running around here like that,,using the extra HP as a reserve power,,4430 will turn down to 95 hp,,and up to about 225 just by turning a screw,, 4630's will go from about 110- 245 HP ,,they have a larger pump. We use to play with them back in the 70's,,just to see what they would do.
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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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