Denso Alternator, how to fit mechanically

[RC 166]

Now some more info about Mr Jung's alternator adapters from back in the mid 2000s. Edit: spelling Jung

One of the local club members showed me his Jung alternator conversion that he collected personally from MrJung in ca. 2005. It is supposed to be one of the very first ones produced with welded-together drive hub from CBX-Kawa hubs and screw/epoxied oil splash shield. He says it has worked flawlessly since first installed. No problems at all. No oil sucked out through the crankcase vent either... I also looked at the welded-together drive hub and it is very precisely done.

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[Warwick Biggs]

Peter, I would love to find a lightweight alternator that I could adapt to my CBX race bike in order to overcome all the problems of total loss. After taking kg's out of my crank for quicker pick up I don't like the idea of adding a heap of weight to slow it down again but it is hard to find an adequate lightweight generator to power 3, even ultra low resistance coils.

[CBX-tras]

Even in the beginning, Stephen Jung realized that there was a necessity for the oil, splash shield.

If the conversion you buy today doesn't have it, expect high oil loss, through the breather that is directly above the alternator.

The shields on mine were welded onto the main plate.
The core alternators were completely disassembled, rebuilt, re-wired, and coated prior to assembly, testing and shipping. The couplers were custom made, one piece, for quality and production.
Photo of what I used to produce, NLA :

[RC 166]

CBX-tras,

Nice product you got there!
Any picture of the welded splash shield?

[RC 166]

Warwick,

Just a wild idea... What about gearing it down, or attaching to something further down in the transmission chain, maybe even to the gearbox countershaft (at the front sprocket)? It will let the crank rev up more freely, not feeling the direct load from the alternator. It will for sure give you less charging efficiency, but will at least counteract "total loss". And of course, any on-board charging system will cost power!

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And... if any administrator reds this, can you please fix so that I receive e-mail notifications on thread reply's? As of now, I don't get any.

[CBX-tras]

CBX-tras,

Nice product you got there!
Any picture of the welded splash shield?

I had them out of 1/4 inch thick, aluminum tubing, welded to the inside of the adapter plate.
This is the only photo that was close enough, from my archives, 10+ years ago.

[RC 166]

Clever approach, alu tubing as raw material.. Nice welds.
And 1/4" must be easier to weld than the 2mm shield I tested.

[daves79x]

Just an observation - a couple of hp loss and a few more pounds of weight due to having an alternator is not the problem with being competitive racing a CBX.

[CBX-tras]

Having an ample/robust electrical supply, from my perspective, far outweighs all the problems associated with the stock alternator.