SOHC.co.uk Forums > CB750
Charging System Specification
Oddjob:
Just found one on the Electrex website Bryan, RPK1550, fits 400/500/550. 25amp output, cost around £550. Improved HP and quicker throttle response as it replaces the flywheel as well, I'd imagine less torque as a result?
SteveD CB500K0:
Less inertia surely. Same torque.
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Sesman:
Yes, same torque. Might improve engine response and net horsepower if the savings in gross crankshaft mass (inertia) exceed the increased alternator flux coupling forces.
philward:
Electrex website says 3 - 5 HP increase for 750 (I have 836 standard compression piston kit as well which Hondaman says is about 5 - 8 hp increase), so useful overall gain without high tuning/revs.
The good thing about the 500 (from my limited once only rebuild knowledge of a 500) is theres no starter gear issues in fitting the Electrex alternator that I am aware of hence none of the issues I'm having. Its worth checking how it affects the fitting of the cover though as I had to source the narrower cover seperately. (Electrex don't supply with the kit). The standard Electrex alternator on the 750 uses a machined alloy plate thats about 15mm thick that fits between the narrower alternator cover and the crankcase. If the 500 version uses the same setup and you use the standard alternator cover, it would widen the engine width. I'm only assuming this is the case based on the 750 setup as havn't looked at 500 version. Worth the pre sale research considering the cost.
K2-K6:
Bhp is only a calculation of torque at X rpm, which means that if the torque remains the same at the same rpm (it's just a function of combustion effectiveness) then the bhp can't alter.
Rotating mass affects the time to accelerate the crankshaft, making it accumulate revs faster (when not moving vehicle mass) but not change the total.
Capacity change increases torque as the combustion total energy is larger for the same rpm, minus the increaes in heat and friction between the two in comparison.
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