Jim has given ya good advice as theres no substitute for cubic inches n compression so I will just toss out a few more things to save a few precious HP in case youre not gonna go to those measures. GET RID OF HORSEPOWER ROBBERS
1) A fan eats up HP and since the pull is so short you can likely get by with less air flow through the radiator. Things like straightening the blades and balancing the fan can gain some HP to the wheels.
2) A generator takes up HP and if by using a simple toggle switch you disable it during the short pull you save some HP. The potential spark gap energy isnt gonna be reduced much regardless if the battery voltage is only 12.6 versus 13 to 14 during the pull
3) Water pumps take HP. Ive seen dudes use 12 volt electric pumps to use stored batetry energy during the pull instead of using up HP from the engine.
4) Heavy oil eats up HP in the form of heat n friction. Im talkin more about gear n tranny oil here n if its ONLY for pulling LIGHTEN IT UP.
5) Of course theres no need to waste any HP driving any more gears then necessary so disable any hydraulics or PTO as you can
6) Have her tuned up perfect ignition wise and the carb set rich enough for when she pulls down hard n heavy.
7) Cooler air is more dense so try n plumb the air intake away from heat best you can and avoid any unnecessary inlet air restrictions.
8) BALANCE have her set so under a hard pull the front wheel just barely float off the ground so alllllllll weight is on the rears. Of course, that has to change with track conditions and needs to be adjustable.
9) Have the rears set in close and drawbar height as high as permissible plus close to the tractor not wayyyyyyyyyyy back. High n close,,,,,,,
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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