And some valid ones too. 12V generators large enough for the job were never considered. The "charge" coil set-up was used on much OPE (outdoor power equipment) for many years. It doesn't produce enough to to do the job here. (single phase, low output) There was a combination starter motor / generator used for awhile on some French cars and Yamaha had them on a few bikes.(125 singles and 250 twins, circa1965) When I consider a collection of systems that make up a device (car, motorcycle, etc.) the integration can be amazing. It would be nice if we never had to make any compromises, but everything has them. The designer that made the rear plugs almost inaccessible on a transverse V6 earned himself a place in... One of my favorite pieces of motorcycle engineering was the CBX. The bike has no flywheel, nor counter weighted crankshaft as the six is in a fine state of balance. This caused it to have incredible crank acceleration. The original design had the alternator driven directly and it would explode on the prototypes. The solution was to put a slipping clutch inline with it so it would not accelerate as fast. It's only about an inch and a half dia and is metal to metal. That resulted in a screech when the motor was reved. A heavier spring cured that. So, one thing after another, all compromises.
--- On Thu, 1/8/09, stanley/ Randolph <[email protected]> wrote: From: stanley/ Randolph <[email protected]> Subject: [Nighthawk Lovers] Re: Starting problems To: [email protected] Date: Thursday, January 8, 2009, 1:44 AM It seems to me that Honda would have been better off with a generator instead of an alternator because it requires no juice from the battery to produce electricity and it is already producing DC and needs no conversion. Maybe there is a problem with too much heat for the magnets. At one time Lawn Boy used an additional magnet in the flywheel to generate extra juice to charge a battery pack which operated an electric starter... So, a magneto system is another option as well. Used to be able to purchase magneto systems for our cars, and maybe still can, but I don't know. Engine would still run despite an electrical supply failure. Just no lights at night after the battery gives its last... just my thoughts on the subject. Stanley From: "[email protected]" <[email protected]> To: [email protected] Sent: Thursday, December 18, 2008 3:40:47 PM Subject: [Nighthawk Lovers] Re: Starting problems When your engine rotates at maximum rpm (10 000), your alternator rotates at more than 19 000 rpm, because it is driven by a chain with 28 to 16 teeth sprokets. Increasing this ratio would need to change the sprokets. The frequency of the magnetic fluxes changes in the stator would go very high, creating more losses in the iron and lower the power conversion factor. The stater, on the same shaft, would drive the engine more slowly when starting, making start more difficult. I think that, though it could be done, it's not a good idea. At 10:42 18/12/2008 -0800, you wrote: >Taking a risk! Would changing the pullys/gears on the Alternator so it >would turn faster at lower engine rpm do anyting? I can't imagine that >it would consume more power than the engine can safely and easily deliver >but... And Yes I do realize that it would take more power to drive the >alternator but is that really the issue. Couldn't this approach be used >to lower the rpm requirement to under 2000 rpm? just asking. If the >archives cover this you can send me there.:-) or where ever you like as >long as it's with MYOIL and not YOUROIL. > >Back to being serious, I can't believe that stock off the shelf devices >aren't available with the pleathora of stuff I glance at every day while >design the mechanical contraptions I design. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/nighthawk_lovers?hl=en -~----------~----~----~----~------~----~------~--~---
