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Tractor Pulling Discussion Forum

Dyno operation

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JH 44

09-15-2006 04:37:50




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I have a dyno made buy M&W.
Would like somebody to explain how to find the max hourse power of a engine. Or how to properly use the dyno.
The way I understand it is: Let the pto run to warm fluid up. Run tractor at wide open throttle,
start turning wheel, and when gauge on dyno is at 540 rpm (which is pto rpm) and just starts to drop below 540 that is the horsepower reading on other gauge.
But if I keep turning wheel it loads tractor more and needle on horsepower keeps rising, and pto rpm is dropping, what is that telling me?
So what is the best way to use this dyno, to adjust my JD A for tractor pulling?

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Lynard

09-15-2006 18:45:12




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 Re: Dyno operation in reply to JH 44, 09-15-2006 04:37:50  
JH 44 I pull John Deeres and usually pull them down to 480 to 500 rpm on the dyno and adjust the fuel and timing to get the highest reading on the dial. Use the guage and measure the pressure at 500 then 450 then 400 and compute it out to get the hp and figure the torque from there and see how much it rises from 535 dyno rpm which is 975 tractor rpm to 400 dyno 722 tractor rpm. At 535 dyno rpm you read the hp direct off the dial. This is on the A and G Deeres. Lynn

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Pete1468

09-15-2006 16:04:26




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 Re: Dyno operation in reply to JH 44, 09-15-2006 04:37:50  
I can get you a operators manual and a parts manual if you"d like. Send me an email with what model you have and I can go from there.



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G/MAN

09-15-2006 07:59:30




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 Re: Dyno operation in reply to JH 44, 09-15-2006 04:37:50  
I'd suggest trying to find the operator's manual and instructions for your dyno. There are enough of those things around that someone probably has the proper instructions and can get you copies.



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JDGnut

09-15-2006 10:35:34




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 Re: Dyno operation in reply to G/MAN, 09-15-2006 07:59:30  
G/MAN's right.. You need an operators manual.. M&W is still one of the major Dyno manufacturers, so you should not have a problem getting information from them. If Dyno has a gauge it will be accurate at 540 and 1000 pto rpms.. You can still use the other rpms when making adjustment.. (to see the increase or decrease in HP) Just that the actual HP number will not be accurate... Many dyno's came with a charge or conversion wheel to figure the Actual HP.. If your Dyno has a digital display, the reading normally have been recalucated.. What the temps of the water of the dyno.. if you do not have a good water supply they can over heat easily... Good Luck... JDGnut

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G/MAN

09-16-2006 07:43:42




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 Re: Dyno operation in reply to JDGnut, 09-15-2006 10:35:34  
Hey JDGnut, they put our AW Nebraska 600 to the test a while back. Had it hooked to a 6950 SPFH to check an overheating problem. Had it cranking around 525 horses for a little while, lol.



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Dynoed

09-15-2006 07:51:08




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 Re: Dyno operation in reply to JH 44, 09-15-2006 04:37:50  
You got the right idea,,, below 540 pto, can measure how much low end torque you can help by setting the tractor up to lug below 540. Usually, if you you just set it to the 540 specs,, if you lug it below that rpm range, it could be off and sputter, or die,, JD A have low end torque,, more than a M IH,, Just think about where your A lugs it out,, is it working hard on the track, then look to tuning it below the 540 range,, that helps you set up for when you really lug the engine down. It may help make a better pass.. just be careful in what ever you do,, I had a hand crank A break my wrist when I was working on it one night,, Dont leave no wrenches up near the flywheel! Hope this helps,,

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