Stupid, crazy project ideas.

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Mar 14, 2007
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Denver, CO
Buddy of mine and I are embarking on a project. We both work in healthcare, but he's a mechanical engineering student and I used to be a welder and can mangle stuff on a lathe a little bit, so we're gonna hit up the metal shop at the local university and screw around some. He's better with design than I am, and I'm a little better at production. Gonna start with plain tube bicycle frames, maybe move up to some weird monocoque type stuff, and see where it goes. Some co-workers have expressed interest in buying our prototype bike frames, so maybe we can make back our materials costs and have some fun while we're at it. What the hell, right?

Anyhow, if that pans out, we're moving on to motorcycles. The hell with human power, says I! Let's roast some fossil fuels! My scooter is in the sig line...only needs a belt drive sprocket and some running gear, but it's been on the back burner since Adelaide went into project mode. But so long as we're working with the two-wheels, I figured I might as well do a little chop work. Maybe modifying an existing frame will be a better place to start for a first motorized project.

This is a pipe dream until January when we can get into the shop, and so we've got some time to dream fantastic dreams until the reality sinks in that we're total retard amateurs. I've got an old 750 Yamaha engine sitting around that I would love to build a crazy frame around...been looking at shaft drive stuff...also wondering about diesel powerplants...

So here's my questions. #1: any Mudders out there with frame-building experience? Like I said, I've done some stuff with roll cages and trailer chassis, but have no idea about building a sound frame from scratch. Where's a good place to start learning?

#2: anybody know anything about diesels? All I've found so far in the bike world is the Track T-800tbi, but the interweb is somewhat lacking in actual info about it. Apart from the issue of relatively low hp/high torque for a scooter, why hasn't anybody come up with a transverse diesel for this application?

I realize that this is all brain candy until I remember that I can't TIG weld, at which point I will probably need to come up with a new hobby. But don't burst my damn bubble, okay?

Any advice appreciated.
 
Not to burst yer bubble. But if you're even contemplating a Diesel power plant, IMO you will HAVE TO incorporate a stressed frame (front suspension bolts to front of block. Rear bolts to tranny or rear of block). IMO, unless you go with a stressed frame expect the engines weight and a frames weight together will have a seriously over weight. And the bike should be underpowered and just won't handle.

IMO, you can do it. just research the e'll out of it and expect to learn a LOT.





Merry Christmas!

The first commercially-available diesel motorcycle



DUH!! Sorry about that! I googled it and came up with nothing?



C, DI, not T,B,I....:doh:
 
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That website was about all I could find on the T-800TDI. Not very informative. I'm not sure why a diesel powerplant seems like such a cool idea to me either, cause I'm not into biodiesel or anything. Maybe we'll build a freight motorcycle! Or maybe we'll just work on some other unusual ideas, like rotary. I know there's a lot more actual building going on out there around rotary platforms, and it might be a little easier "standing on the shoulders," as it were.

Please clarify a stressed frame. (Like I said, no experience, no clue, no idea what I'm doing.) Am I understanding correctly that the block functions as part of the load-bearing structure of the suspension? Is this a function of the greater torque delivered by a diesel? Can you give me an example, or better yet, a picture?
 
In F1, the rear suspension bolts to the rear of the transmission. It's not "framed", or supported by a frame. The engine is bolted to the tranny, the front half of the car to the front half of the motor...and so on. If you have a place to bolt something, you bolt chassis components to it. Then the engine being bolted to the tranny, and no other parts are supporting it (like a frame), the engine and tranny combo are now stressed. Together they form the chassis.


Motor and tranny in your car? Not stressed.

Chassis components bolted to the front or rear of a motor, and the two pieces used together, load bering, and it's then "stressed".
 
The military has been letting go of a few of their diesel KLR650 variants recently. Around Colorado Springs they are going for about $20k. Hayes Diversified Technologies builds them. Have you looked at their stuff? They are mentioned in that article.
HDTUSA.com states they have temporarily halted production of civilian bikes due to increased military demand. Cranfield University in the UK designed the HDT motor and may have at least some of the specs available.
 
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On a side note, depending on whether you want one for you or for production, I built a diesel bike out of a 1974 BMW and a 3 cyl., inline 1.1 liter Kubota generator motor. mounted 2 radiators on the front and the shaft drive and transmission were easy to mate up with a homemade adapter plate. Since it was a generator motor, the internals were set to run at 1800 rpms, but we just tried to keep it close to that at speed and never had a problem. Those engines are pretty common on trailer style air compressors and light towers. Might be a good place to start.
 

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