SOHC.co.uk Forums > CB750
Charging System Specification
Oddjob:
I seem to recall reading that Harleys have greater torque due to the inertia of their flywheel being some big and heavy, which would make sense as it would take more load to slow down such a mass of moving metal, would also explain why they rev so slowly.
So I'd have imagined the same would have happened by removing the mass, it's quicker to speed up but just as quick to slow down. So if the engine is slowing down on a hill faster for example and your needing to change down to keep up speed then that's the same as having less torque?
Sesman:
I wonder how they justify a 3-5 Hp increase when the alternator output increase is only say 100w. The hp increase could only be realised, generally, by fewer gross losses or increased rpm?
Oddjob:
IIRC a 500/550 alt only produces 150w so the Electrex alt doubles the output. I'm wondering if the 12a battery can cope with that or whether fitting a higher ampage per hour battery of the same dimensions would be better.
K2-K6:
--- Quote from: Oddjob on February 18, 2022, 02:17:51 PM ---IIRC a 500/550 alt only produces 150w so the Electrex alt doubles the output. I'm wondering if the 12a battery can cope with that or whether fitting a higher ampage per hour battery of the same dimensions would be better.
--- End quote ---
One is a store (battery) one is a production line (alternator) that obviously do different things. If you can run all demand out of a bigger store, within the capacity of that store, then you'll not run out of power. Likely that's never going to be the case though. Racers may do this though and tun without power generation.
You could almost get away no battery-ish though, as with enough output from alternator will run everything continuously. Just couldn't start with electric though.
K2-K6:
--- Quote from: Sesman on February 18, 2022, 02:09:51 PM ---I wonder how they justify a 3-5 Hp increase when the alternator output increase is only say 100w. The hp increase could only be realised, generally, by fewer gross losses or increased rpm?
--- End quote ---
I don't see that either, at full output it should be consuming more torque to give that output.
The torque peak is essentially controlled by camshaft timing, ie optimised flow dynamics to fill the chamber and make the most productive burn to push the piston down.
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