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Re: 830 adjustable cam timing

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12-04-2012 09:39:00

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Oh gosh! I remember that chart! What a goofy sense of logic. So, they read the torque as hydraulic pressure at the pto speed of 540, then they kept cranking up the pressure, and lugging down the engine and read the max pressure with the engine barely continuing to stay alive. So even if was making more pressure, it was doing it in fewer turns over time, hence could even be less horsepower, and quite possibly is. Which is why you always have to pick a standard speed to rate it at, and the manufacturers agreed, or rather the Univ. of Nebraska test lab recommended after the government decided to regulate the outrageous claims of tractor manufacturers, the standard pto of 540, and the engine speed that it takes to develop 540 rev/minute. A quick check on torque curves is to crank the pressure wheel in to get a 10% reduction in pto speed, and then see if you gained 10% on the pressure meter. If you didn't get 10%, you didn't "gain" at all.

This was not the first time I've seen a dyno operator not understand what the gauges were telling him.

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12-04-2012 11:17:12

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 Re: 830 adjustable cam timing in reply to F-I-T, 12-04-2012 09:39:00  
A couple of those 80 series must have had a lazy governor setup. Of note the stock 435 with the 2-53 made "46HP" straight through from 1200 to 2400rpm. Flat torque "curve" was great for running up through the gears on a highway tractor but felt like a dog on hills. The irony being the two stroke was always at peak torque and was considered gutless. And the fourstroke that falls on it's face as it loses torque approaching redline is considered the powerhouse?

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