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G-MAN
10-07-2002 10:34:35
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Re: 620 power in reply to 235, 10-06-2002 14:39:52
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Robert's for carb work, although I'm not sure what he offers for duplex carbs. But he can tell you your options. Flywheel - leave it alone. It's cast iron and weight would have to be bolted on or poured in to holes machined in the casting, both of which are likely to lead to cracks and probably an exploding flywheel - not a pretty picture. More weight is not going to improve your power. It's only going to create more interia as well as throw off the balance of the engine. More intertia may help lugging a little bit, but it's also going to take more power to spin that heavier flywheel. Heavier flywheels are generally used to help engines that are low on low-end torque pull harder off the line, due to the greater interia. Two-cylinder Deeres have plenty of low-end torque, so you're not going to have trouble starting the sled. More power is gained in a few specific ways - more air and fuel, more displacement, more compression and more speed. Boring, stroking, head work, carb work, cam work, intake and exhaust work, ignition work and such are the ways to gain power. What is that makes you think you need more power? I would start with a good tuneup and/or overhaul if necessary, along with the simple and easy power improvements, such as bigger valves, minor head work, ignition upgrades, higher compression and so on. Even these fairly simple mods are going to take a bite out of your checkbook. If you're having trouble hooking up to the track, more power is just going to make it worse. Your tractor should be able to spin the tires easily in first gear, unless the track has an ungodly bite. If you're getting beat by Olivers, Farmalls and the like that are really screaming down the track, you are going to have to spend mucho dinero to run with them, and it will be difficult even then. A lot of times, slow and steady can get you through tough spots hot tractors will spin out in, but speed is still hard to beat, and expensive to get in a two-lunger. You're better off concentrating on proper tractor set-up, track reading and driving. As far as superchargers, you're not specific about which type. Centrifugal or Roots-type? Turbochargers are exhaust-driven superchargers. Are you interested in turbos? There have been turboed two-cylinders from what I understand, but it would be a considerable undertaking to install one and make it work properly without damaging things. Superchargers make boost, which increases cylinder temp and pressure, which can break parts that aren't up to the task. Turbochargers also increase the load on lubrication and cooling systems, so mods may be necessary there, if you get one to work. I guess in my humble opinion, you're probably much better off to go slow and easy while modifying your tractor, so you can see the pros and cons of each mod, rather than jumping in head first just to keep up with the other guys. You'll probably be better off in the long run. If you really want to run fast, you'll be better off with some other tractor than a two-cylinder, unless you have extremely deep pockets and pretty good mechanical ability. The old racing adage applies to pulling just as well. Speed costs - how fast do you want to go?
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