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| https://dynotechdynamometer.com/aarons-power-corner/agricultural-pto...
Good info given here on some history of portable dyno’s used in the ag industry.
Long story short a prony brake style dyno is the only way to accurately measure PTO hp at the manufacturers rated engine speed.
A hydraulic dyno (M&W for instance) is ok for getting a general idea if the tractor is making close to rated horsepower but isn’t very accurate, especially if the operator doesn’t know what they are doing. | |
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Tractor dyno?
