Gallery, Projects and General > How do I??

Dynamometer - a friend questioned and i have no idea.

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bhowden:
That level of hp might be out of range for this but many years ago (40 ish) I saw a dyno somebody had made out of a torque converter.  The torque converter mated up to the engine and the other side was attached to a lever resting on a scale.  They had tapped the torque converter with fittings and ran the oil out through a large cooler and controlled the amount of oil let into the converter to control how much resistance was applied to the motor.  Do any really large trucks use automatic transmissions now?

Another thought might be to have strain gauges mounted in the motor mounts so you could get a data log of every run and convert that to hp.

Brian

NeoTech:
Well all bench brakes use some sort of strain gauge and an arm like you said there.
Usually the brake is mounted in pillow blocks allowing it to rotate but are stopped on a gauge..

The HP is then calculated by doing (rpm*torque)/5252 - and you will be in the correct ballpark.
For a sweep curve, you would read the rpm, and control the inflow of braking media (water or electricity if using a telma) and then make sure the engine under full load can't accelerate more than 300rpm / s.

That would make several datapoints availabe by rpm and torque..  You would need something around 200hz in polling rate for this, and an algorithm that sorts out all the crud or averages the reading during each second. Its here i have decided to use an FPGA from Xilinx - cuz everything can be connected to it, its blazing fast and you can just connect an USB to it for dataread out, stream or buffer. =)

NeoTech:
The stator housing would need to look something like this. with squar vanes, and a return "area" for the medium, the impeller would also be of the square wanes typ but with no center opening so it pushes the water outwards and it will hit the vanes, return to the center and go out again.. in flow on both sides and an exit at the bottom of the stator housing.

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