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ChadS
01-31-2004 08:18:09
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All this talk of politics lately,, I forgot about talking about tractors.. LOL Well here is a few pointers on IH H-450 including W series tractors, on how to get more rpm out of your stock governor,, and a few do s, and dont's. Most pullers ar always looking for more rpm, and throttle responce in their IH puller. Most just back out the adjustment bolt in the governor using a stock spring. Well, yes it iwll increase rpm a bit,, but will over stress the stock spring in time. A stock governor spring,, is only good for about 1900 on an H series, and about 1750 on an M series. In retrospect,, this is not helping you. Most say "well wrap up the spring with wire." well, that will increase rpm too, but takes away the function of the governor, a major don't do. Not only will it over stress the internal levers in the governor, it is so difficult to set the rpm range you need to be legal in a class. And is dangerous!! that governor could open up that carb and the rpm could open up out of control. Imagine if that happens and not expecting it, Could be disaterous. OK,, There is 2 different styles of governor systems, a 2 weight, and a 4 weight. A 4 weight system has 4 speed controling weights in the governor. Most commonly called M&W. This system, will work well in a farm and field situation when the rpm needs to be maintained, but it really does not increase the performance of the engine. On dyno tests with this governor,, It is a slow, unresponceive system, and is the most difficult sytem to get higher rpms out of it. Even spring changes are hard to calculate, because of the increased pressure the 4 weights puts on the spring levern and shuts it down to the rpm it is designed to run. The 2 weight governor, is the best system to run on a pulling tractor. It is a very responcive system and is easy to increase performance of the engine. Ok,, Only modifications that need to be done to the IH governor is to change the spring. That little spring,, controls fast idle speed, throttle responce, and lugging capabitlity. My research on modifying 2 weight governors, I have ground off materials on the weights, changed lever angles, and so on and so on,, But the best way, is to find the right spring. The pupose of finding a good spring, is to be able to go beyond the rpm range you are allowed to run,, and then adjust it with the adjustment bolt. It will speed up governor operation, thus increase throttle resopnce and HP. Stock governor springs will shut the governor down as rpms begin to drop when putting a heavy load on it. It will not hold the carb open as rpm drops, it shuts it down faster, results,, power stall. When you increase the governor operation,, it will hold the carb open longer, and maintain rpm, and hold it open till the very end, even as the rpm drops, the carb will be open. Results,, more distance, and it may not power stall the engine as fast. The governor spring will be different in the H and M series, the H is a shorter spring,, and the M is a longer spring. If you switch the 2,, the M wont idle, and the H will not rev up. Remeber,, the governor is an engine control component, and is a very important part of any performance up grade. Most people bash ol Denny about his carbs,, well that is ok I guess, but if you have done nothing to the control that runs that carb,, the carb is just as useless a s stock carb. To me,, it is a misconception of the understanding on how these upgrades will help a tractor create power. But that is another story at this time.. Point is,, the governor is the key to unlocking a few more ponies, and change the entire characteristics on how the engine will run on the track. Hope this helps answer any questions that any may have. Chad
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