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Tractor Pulling Discussion Forum

JD G

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ChadS

04-03-2004 07:07:11




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Now I know why every deere puller dislikes that wico distributor mag, and switches to a distributor. HA HA. I went ahead a replaced the governor spring lever on it, and that helped a alot, the old one, it is weak, and old.The new one helped responce, and actually opened up the carb all the way when on the dyno. So, I ended up with 53. no more. It will lug hard too. and I set the rpm below 540, (around 350) and reset the carb. so, it has a bit of advantage, low hp, but can lug it down to it's knees and not stall out so fast. Do you dyno guys see a point here? Tell me, do you set the carbs at 540? or ?? I am usually below 540 when setting the carb, at more of a lug in the engine, To me, if the engine is stock, and will be lugging the engine hard, why not set it to run that way? sure I go back and read the 540 hp,,, but, before you do dyno tune your next tractor,, lock up the brakes and simulate a hard lug on the engine, then put it on the dyno, reset the carb at a harder lug, than at 540, then go try the brakes again. bet ya it won't stall so easy this time round!! Think about it!! engine tuning does not stop at 540, unless you have a big bore/stroker engine, and do not wish to work it that hard, but for you stockers out there, may be good for some braggin rights this year! and JD loves to lug! Chad

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al

04-03-2004 10:53:21




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 Re: JD G in reply to ChadS, 04-03-2004 07:07:11  
Is it neccessary to lug it down to full hp at 540?
I was afraid of twisting something?
Can you tune it with a limited amount of twist and use that rpm each time?



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ChadS

04-04-2004 09:47:07




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 Re: Re: JD G in reply to al, 04-03-2004 10:53:21  
Well, everone has an opinion to dyno engines. some stay at 540, and not below. to start with, if the engine is running well, no sputters, I will start at 600 pto rpm to warm it up, then do a harder pull on the dyno to check the carb under a heavy load on the engine. usually, I have to richen the mixture to lug it hard, (no harder than what it would run in the field, or on the track)if you want lug power, set the carb to run at a heavier load, than at 540 pto rpm, a good dyno operator knows the limits when testing engines at lower engine speeds. I don't lug it so hard that it stalls out, that is not good to do, but I load the dyno, to set the carb and timing at below the 540 specs, and look for improvements in the way it runs while lugging. Dyno tuning,, is not just at 540 on a puller. 540 is just a measurement of power output at rated pto speed. which is fine, but we all know, on the track, a stocker has the tendency to stall out, and by dyno tuning the engine to run at the low rpm will make a huge difference on the track. Yes, you can limit the rpm on the dyno to set HP at rpm, I do that when first starting out on the first dyno pull, to see how close it is. Hope this makes sence, LOL. Chad

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