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Tractor Pulling Discussion Forum

Chassis dynos

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Ron..NE ILL..10

12-11-2005 19:59:12




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Has anyone used an automotive (truck?) type chassis dyno to check pulling tractor "in gear" vs pto dyanameter? It would be a fair amount of work to re-install PTO in this tractor.

So-do the chassis dynos work for tractors?

Thanks




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LW

12-12-2005 14:05:14




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 Re: Chassis dynos in reply to Ron..NE ILL..10/48, 12-11-2005 19:59:12  
I have talked to some guys that have. They claim that it worked fine, I have my doubts though.



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G/MAN

12-13-2005 07:25:04




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 Re: Chassis dynos in reply to LW, 12-12-2005 14:05:14  
I'd have to see it done to believe it, and see the chassis dynos compared to PTO and/or straight engine dyno results to be convinced. Chassis dynos measure horsepower over a specific RPM range, not at a certain rated speed as a PTO dyno does.



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LW

12-13-2005 17:31:46




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 Re: Chassis dynos in reply to G/MAN, 12-13-2005 07:25:04  
You also have greater mechanical losses to consider that you probably won't have a known value of. I know that I have witnessed a engine go from the engine dyno to the chassis dyno and there are grave differences even after drivetrain losses are known and added back in.



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Ron..NE ILL..10/48

12-14-2005 05:53:20




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 Re: Chassis dynos in reply to LW, 12-13-2005 17:31:46  
Re. drivetrain mechanical losses....isn't this net result of more interest to me than pto hp? Not arguing-just questioning. I realize there are usually only a couple of gears involved in getting pto out the back end vs transmission gears/planetaries etc, but that may give us more real insight to the hp to the ground. Though, I realize it's still not really the ground. Whether the tractor has 100-200-500-or 1000 hp isn't what I'm looking for. I want to see what differences will show from fuel-ignition-air mods/changes.

I would worry that perhaps wheel "trueness" might affect chassis dyno. In other words, would tractor try to "hop"?

I believe they use chassis dynos for semi trucks in some places, so would tractor results be that much different? But-I know NOTHING about chassis dynos.

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G/MAN

12-14-2005 07:27:47




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 Re: Chassis dynos in reply to Ron..NE ILL..10/48, 12-14-2005 05:53:20  
PTO horsepower is an industry standard for rating tractors because it's a relatively simple and convenient way to check performance. I still maintain that tractor tires aren't going to work on dyno rollers worth a darn., and depending on the size of the roller, the ride could be downright rough. PTO dynos are used to "load" the engine to a specific rated RPM. Chassis dynos read out a graph of torque and horsepower over an RPM range. And since drivetrain power loss is going to remain relatively consistent, if you make mods that raise your PTO horsepower by a certain amount, it follows that your horsepower at the wheels is going to follow a similar curve, once the loss percentage is applied to the new PTO horsepower level. How do you determine what you're losing? A chassis dyno alone isn't going to tell you. You'd first have to know flywheel horsepower numbers, then relate them to wheel horsepower numbers to figure the loss percentage. Seems like a lot of work to determine how much power you're putting to the ground when a PTO dynoe can tell you how much power you added.

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G/MAN

12-12-2005 13:24:35




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 Re: Chassis dynos in reply to Ron..NE ILL..10/48, 12-11-2005 19:59:12  
I can't image tractor tires running too smooth on a dyno roller, or being able to effectively transfer power, for that matter. They're made to put horsepower to dirt, not steel.



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Shaggy

12-12-2005 09:55:20




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 Re: Chassis dynos in reply to Ron..NE ILL..10/48, 12-11-2005 19:59:12  
My Nephew knows a guy that put one in last year and we are supposed to take out tractors over and give it try some weekend. But our tractors are probably smaller than yourS Tis guy is in Seneca IL.



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REDEYE

12-12-2005 09:39:15




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 Re: Chassis dynos in reply to Ron..NE ILL..10/48, 12-11-2005 19:59:12  
As most tractors only travel around 20mph I think that this would be too slow for the dyno, or the tractor would make too much torque for the dyno at this speed. Also without bald or turf tires there would be a lot of slippage on the rollers.



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