Quote:
|
Originally Posted by ian.stewart
surly if it takes 5hp to drive the oil pump, and you remove the pump from the engine and put an electric motor on the pump, does it still not take 5hp to drive the pump??
|
No, it takes more than 5hp. Alternators are not 100% efficient, batteries are not 100% efficient, therefore there is a loss in the power supply to the pump, probably as much as 20%, therefore it would take 5hp+20% to drive it in real terms ie: 6hp.
It's like these people who think that running a Lexus or Toyota Hybrid drive car is better for the environment. It is not, because of the reasons I describe relating to the efficiency of generating devices, and storage devices, let alone the motors themselves. I have seen many road tests for these, and their overall fuel consumption is higher than that of a conventional drive vehicle, plus there is the end-of-life disposal of the batteries to consider. Not green, no no no no no no nooooooooo.
The most efficient drive is direct mechanical with low friction in that drive.
Using the pump, like an accusump, to pre-charge the oil system before the engine fires is fine. To expect to use it in place of the existing system, I feel is misguided.
Until we get the Mr Fusion Home Energy Generator (as fitted to a certain DeLorean), we won't be getting something for nothing (or nearly nothing!).
Rob.