ChadS
02-21-2004 06:51:11
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Re: Re: 73hp jd G? in reply to lynn, 02-21-2004 06:20:03
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I have to put my 2 cents in here, Lynn, are these actual dyno tests? Why wouldn't the engine pick up HP when you lug it past 540? In all cases I have built and tuned tractors, the Hp should increase a few HP when you lug it past 540, or 535, then drop off. Even on our 730 it goes up about 9 hp when we lug it below 540 before it drops off. Now, on a stock unaltered carb, that, what you described will do that. go up to a cretain HP at 535, nad when you lug it past, it drops off during to pull down. Somewhere in there, a factor is not right,, from one dyno man to another, It should get stronger when you go past 540, increase maybe 5-10 hp, then drop off. Here is what I am talking about... A 240 ci Farmall H 4 cyl 225 psi compression at 535 it is 72 hp. at 400 it is alomost 85 before the hp drop off. Now I know that comparing apples to oranges here, but it is all the same theory in my opinion. How I got the engine to increase HP when it lugs, is the amazing part, carb, and governor work, good fuel, and ignition. Tuning the engine to run at 540 is fine, but when you have an engine that has a strong power curve, and a carb that does not match it, it will drop HP, before it makes it. It has to be designed to lug, not just at 540, but all rpm ranges. Just my opinion,,, ChadS
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