D2 Generator to alt conversion

[2bluejon]

I am working on a generator to a Alterator conversion and i was wondering if ther were others out ther that would be intrested in buying one or having me convert your generator i will be posting some pic when i get it done so you can see how i did it thanks pm if you want

[OzDozer]

2bluejon - I'd be interested in seeing the design you produce. My best buddy is a machinist, and we are looking at fabricating an all-steel, alternator conversion for the D4400 engine. I have a D4400 generator and a U/S engine to work from.
I guess the secret is to keep it simple, and the machining to a minimum. I had thoughts of using a larger size, vehicle water pump shaft, about 3/4" diameter and around 8" long, for the main shaft.

The water pump shafts come complete with a sealed needle roller bearing .. but I could see that perhaps the drawback might be the cost, over the counter, at a bearing supplier.

I have another buddy who has a huge stock of surplus commercial products such as bulk bearings, couplers, and whatnot .. who may be a better (read cheaper) source of shaft and bearings.

I'd like to see how many people would be interested in a conversion adaptor, and whether they would be happy supplying their own pulley, or would want it complete, ready to run. I'd also like to get a $$ figure that people would be happy to pay. I'm thinking around about US$250. Any advice/thoughts/recommendations welcomed.

[Old Magnet]

If it's another variation of these types I'd be interested.....if it's another piggy back generator type.....no thanks.

I would think the most useful conversion would be the double belt pulley version that would also replace that "mickey mouse" adjustable pulley arrangement as well as mount the alternator.

[2bluejon]

Well looking at the pic you posted i think that the one i am makeing will be the same yours looks good

[Old Magnet]

Hi 2bluejon,
Didn't mean to imply that it was one of mine, or that I was the fabricator. Just another variation that is already out there. The pictures were provided by one of the BB posters....and the unit purchased in Canada....not sure where as I didn't get any more info on follow up questions. I'd be interested in seeing your version.

[OzDozer]

OM - Does the standard drive arrangement of the earlier generator setups, develop enough RPM to run an alternator directly, as in the setup you pictured? I see in the parts book where there are numerous size gearsets, with later ones appearing to have smaller and smaller gears, to obviously increase generator speed.

The RD-4 engine I have, has a 26 tooth gear on the generator .. but I haven't counted the gearset teeth yet, to determine the generator RPM.
At a quick glance it appears that the generator is only doing about 1500-1800RPM at rated engine RPM, and I was under the impression that alternators need more RPM than this to produce adequate output.
I do understand that alternators produce near maximum output at relatively low speed, but I have never seen the actual RPM figure.