Originally Posted by
Booger1
Not my numbers.That's industry standard for chain vs fluid drive in general.
Efficiency has nothing to do with size or input.
On chain drive,if 10 HP goes in,9.8 HP come out.100 HP goes in,98 comes out.The only difference is the size of the chain. Same with fluids.
Don't know which industry you're quoting, but everything I find about hydraulics says 85% best-case-scenario:
http://www.machinerylubrication.com/...pump-condition
You also have to differentiate between volumetric-efficiency versus mechanical-efficiency. Just because you can get the output-shaft to run at 97.5% of the speed of the input, doesn't mean that 97.5% of the power got there. It's actually much lower than that due to various factors such as viscosity and shear friction.