Quote:
Originally Posted by J-Mech
I don't really know what you are looking for..... the transfer of HP through any transmission results in a loss of HP. Hydrostats are approx 86% efficient (IIRC). You really aren't going to notice any loss of HP because you will lose traction before you lose power. Yes, the hydro can handle 4000RPM sustained, the motor on your cub should be running 3600RPM. Here is a thread from our technical section with a simple explanation on how hydro's work: Hydrostats: How they work. Here is an article on the efficiency of the hydrostat and the mathematical equation used to calculate it. HYDROSTATIC DRIVES. Hope this helps! Welcome to OCC!  |
Thank you for the links.
What I am getting at is, there really is no reason to repower with 24HP over 18hp as the Hydro unit will only transfer around 16hp to the transaxle. I guess if for some reason you needed the full HP available at the tires AND some reserve HP for belt driven items you would use the higher HP engine. Although I can't really think of needing max traction HP and PTO belt power at the same time. Usually you need the traction HP for dirt plowing and snow plowing but you don't need any additional PTO belt power for either one.
I'm fairly well versed in hydraulics and hydraulic applications that is why I know that regardless of 20hp input or 30hp input the hydro unit will only put out an amount of power directly related to the maximum - pressure/flow/rpm of the pump.
What I found is that the hydrostatic unit is rated at 2500psi continuous. The hydrostat unit also has output torque of 135in-lb for every 1000psi. So 2500/1000=2.5, 135x2.5=338in-lb or 28ft-lb of continuous output to the transaxle.
Next I will figure out the hydraulic lift capabilities.