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JDH: CB750 Conversion - Let the Fun Begin!
Submitted by jdh2550_1 on Tue, 12/04/2007 - 20:50
I got my batteries delivered on Friday. I now have about 360lbs of lead to play with! Along with a whole bunch of other stuff and I need to fit it all in that poor, unsuspecting 750 frame...
I went to the local metal supply shop and bought some 1/8" strap and some L shaped as well. I've been playing around with specific mounting strategies in my mind for a while - now it was time to try them out for real. So far, touch wood, I've been reasonably happy with my progress.
The front four batteries are now in place. The lower three are held together by 4 L-shaped corners fastened together with 5/8" threaded rod. Four flat straps are used to provide top and bottom support and to form the third and fourth side of the box. The middle bottom battery rests on two brackets (made from the strap) which attach to pre-existing motor mounts. The fourth battery sits on top of the middle battery forming an inverted T. I'm reasonably happy with how it has turned out so far. I need to fasten the bottom middle battery to stop side to side and back to front movement - I plan on using more brackets made from flat strap and attached to the engine mounts and four more threaded rods. The additional straps will fasten to the frame and spread the load from the existing two straps (four bolts). The additional rods will be longer and will also fix the top battery in place.
The battery on top will also attach to the frame - different frame attaching point than the bottom battery - not sure on this yet. I'm holding off on mounting this top battery and the fifth battery (which sits over the top of the motor) until I've fitted the motor. I'm in process of ordering an ADC motor 6.75 inch diameter, 11.3 inch body length (not including shaft). It's rated at 8hp continuous, 35hp peak. It's a base mount motor and I'm hoping that I can simply attach a floor between the two frame rails and mount the motor to that. Not sure if I'll get the floor welded in place or whether I will drill into the frame and bolt the floor in place (Bidwell's El-Ninja uses lots of bolts in the frame). If I do go the drill and bolt route then I'm starting to think I might be able to complete this without welding (that was the original goal after reading Bidwell's book - but then I started to doubt the feasibility of this approach.)
Here's pics of what I've done so far. Bear in mind that nothing is finished or tightened down - it's still very much in the design stage. I sure wish I had access to a full metalwork shop and that I had the skills to fabricate better brackets - but seeing as so far I've used nothing more than a drill and a hand held grinder I'm pretty pleased with myself! (I run the risk of "pride before the fall"...)
OK, so it is kind of wide! Maybe I should have one of those "Wide Load" signs? I could have made it a little narrower (maybe 26 or 27 inches rather than 28). The original motor was about 23 inches at it's widest point but the bulk of it (the cylinder block) was probably more like 18 inches wide. Ah, whatever, at least the weight is low. This represents a little less than half the major weight addition - I have another 3 batteries to add and the motor (which is 60lbs of fun).
Hmmm, at the moment I'm actually starting to think I might be riding this in the spring... (this is by far the most ambitious mechanical project I have undertaken so I've approached it with a healthy dose of skepticism!).