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Math question

R

rrlund

Well-known Member
I wish I'd paid more attention in high school. There has to be a simple way to figure this,but not simple enough for me.
If a PTO runs 540 at 2400 engine RPM's,how fast is the PTO running at 2000 engine RPM's?
 
(quoted from post at 20:58:56 06/27/15) I wish I'd paid more attention in high school. There has to be a simple way to figure this,but not simple enough for me.
If a PTO runs 540 at 2400 engine RPM's,how fast is the PTO running at 2000 engine RPM's?
Click to expand...


Probably an easier way but 2000/2400= .8333
540x.8333=449.982 RPM
 
Divide the engine RPM by the PTO RPM then multiply by the new engine RPM (2000). I get 460 PTO RPM. Any reason for figuring this out?
 
The original injector pump is still on the combine engine that's in the 1850. It ran at 2000. The tractor engine ran 2400 and that's where the tach says is rated PTO speed.
 
When I needed to know the rpm's my compressor was running at, after screwing up mathmaticaly, I bought a cheap HF hand held tach, stuck a small piece of reflective tape on the shaft, and shot the rpms. It worked so well, that I have checked the hammer mill, and 3 tractor PTO's, also works on an engine balancer pulley.
 
If I had a scientific calculator it would not have rounded up from .225 to .23. Sorry about that error.
 
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