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Discussion Starter · #1 ·
I have a reverse-trike project that's been dreamed of in my head and on paper for a decade and has just begun in earnest in our shop, based on an 1100 motor package. Before I commit metal to incorporating the 1100 final drive in the chassis that's being mocked up, I'd like to know if the 1800 final drive will mate up to the 1100 output shaft with little or no modification. We have excellent fabrication and machining capability, but I'd like to have some idea of what we're in for.

The later drive, with its open-side swingarm and linked single shock is perfect for my needs in terms of wheel and tire selection and suspension unit options.

For what it's worth, I find it hard to understand why the brilliant Goldwing boxer motor and sturdy final drive package hasn't inspired hundreds of reverse-trike projects all over the world.

Since trikes are not a dirty word on this forum I'm looking forward to sharing my project here.

Thanks for any assistance you might provide.

Mike Bishop
Santa Rosa, California
 

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Junior Grue
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The 1200 engine swing arm and drive shaft will bolt up perfectly to the 1500 differential and wheel.
The question was will a GL1800 swing arm and final drive mate to a GL1100 engine.

Mike will have to do the research as few if any have tried this.
 

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1) I'm not an engineer.

2) I am an optimist.

3) The likelyhood of the spline from the 1100 being able to mate with the one from a 1800 at the engine end are remote. BUT...

If this were my project I would be looking at cuting the shaft of the 1100 close to the top of the driveshaft and splicing the 1800 shaft to this. It's just a hunch but the shaft from the 1100 is likely to be smaller in diameter than the 1800 by vertue of the fact that the driveshafts from monoshocks are larger. A simple collar should do it.

Your best bet for good practical advice on this would be those in the drag bike scene. Lengthing the drive on those bikes are the norm.

Interesting choice of the 1100 for such a mod.

Just out of interest have you thought of the BMW K100 series. They have mono side driveshafts?
 

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The Irish Crew
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It won't be a small modification Mike, some cutting and welding will be needed. It definitely isn't just a straight bolt up job.
 

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Hello and Welcome trikemike .Do I understand correctly , you only want to know if the drive shaft spline is the same ? Thats what I pick up on . Your willing and knowing you have to make the suspension mounts . Obviously your looking to have a wide meaty rear tire . I am sorry I can not give you the answere . I wish you the best in solving the problems that may arise and look forward to watching as you build out this dream bike .
 

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Discussion Starter · #7 ·
1) I'm not an engineer.

2) I am an optimist.

3) The likelyhood of the spline from the 1100 being able to mate with the one from a 1800 at the engine end are remote. BUT...

If this were my project I would be looking at cuting the shaft of the 1100 close to the top of the driveshaft and splicing the 1800 shaft to this. It's just a hunch but the shaft from the 1100 is likely to be smaller in diameter than the 1800 by vertue of the fact that the driveshafts from monoshocks are larger. A simple collar should do it.

Your best bet for good practical advice on this would be those in the drag bike scene. Lengthing the drive on those bikes are the norm.

Interesting choice of the 1100 for such a mod.

Just out of interest have you thought of the BMW K100 series. They have mono side driveshafts?
We're for sure counting on some machine and stitching work to make this connection happen. I was hoping that there might be some easy parts interchange that someone knew about.

FWIW, the 1100 was selected as the motive power because a good pal had a fresh one in his warehouse and no need for it other than to help a friend -- me -- with a project. The same pal also gave me a complete severely weathered 1000 Wing to knock apart for mockup elements.

I've been involved with Honda motorcycles since February 1960, as a motorcycle racer and promotional writer. I remained involved with Honda as a consulting vendor through my retirement in the late '80s. I'm a hardcore Honda fan and follower, and I can't imagine a more satisfying reverse-trike car/bike than one based on a Goldwing powertrain.

We're about to commence rough mockup of the essential bits so we can start laying out some dimensions for the relationship of the elements as well as the overall dimensions of the vehicle -- wheelbase, front track, CG . . .

I'll be sharing words and pics as the project progresses. Thanks for your info and answers to my questions.

Mike
 

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i'm really thinkin a 1800 chassis or a 1500 would be a better choice as a sarter for a trike project. The 6 cylinders with reverse would make a great package And probably more economical to build.
I have learned in the past it is best to pic the most suitable candidate to start with not the one you may have sitting around.
And on a different thought why would you not make the trike front wheel drive. seems to me you could solve some of the stability problems of a reverse trike with FWD.
Wilf
 

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That is a big gearing change, have you thought of that? The 1100 is 3.10/1 and the 1800 is 2.50/1.
 

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Trikeman I see your post while looking for the very same thing, I to have been thinking of a reverse trike for a few years. I finally started mine last spring but it was put to the side until last week when restarted again. anyway was wondering what are you using for a front end (Mustange II for mine) I built a 1 1/2 square tube frame and have the 1100 mounted. right now I am hung up on the swing arm mounts (wishing I would have used a junk frame). I only have hand tools but am going to see what I can do. Any way if your interested I could send a pic of it, although not much right now. Sorry for the long post on my first one.
 

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If the 1800 shaft is larger at the front end .... which I suspect is the case .... just have it resplined to fit the 1100 U-joint output yoke.

:thumbsup:
 

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While I have never tried to swap in a rear end from one goldwing to another I have swapped rear ends between cars. I dropped a Small Block 327 into a Chevy Luv and in order to handle the additional horsepower and torque I narrowed up a Dana rear end from a Dodge Polara to fit the Luv. I found that cutting the splines off the axles and welding them back on after shortening them makes the axle very weak. I ended up sending my rear end to a machine shop in Anaheim, CA. called Henry's Machine Works where they make rear ends for dragsters. (no relation to me) They re-splined the axles for me.

I would suggest that if the 1100 drive shaft is smaller than the 1800's and you can machine in new splines that would be the way to go.

I know you have this great boxer engine sitting there already but by starting with either a 1500 or an 1800 you will save a lot of time and effort in modifying things to make them fit.

Make sure to keep us updated with pictures.... kind of like motorcycle porn for those of us addicted to bikes.

Henry
 

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Discussion Starter · #13 ·
That is a big gearing change, have you thought of that? The 1100 is 3.10/1 and the 1800 is 2.50/1.
Excellent point, Dave, and something that I would have had to live with had physical work on the project not stalled while I complete a book project (that's about done!).

Mental work on the 'threeler' has continued, however, and rather than living with a narrow right passenger seat and a tall driveline tunnel it looks like a Gilmer belt-driven interim shaft that will center the shaft in the cockpit and drop it down several inches will also permit us to play with final-drive ratios.

Mike
 

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Discussion Starter · #14 ·
Trikeman I see your post while looking for the very same thing, I to have been thinking of a reverse trike for a few years. I finally started mine last spring but it was put to the side until last week when restarted again. anyway was wondering what are you using for a front end (Mustange II for mine) I built a 1 1/2 square tube frame and have the 1100 mounted. right now I am hung up on the swing arm mounts (wishing I would have used a junk frame). I only have hand tools but am going to see what I can do. Any way if your interested I could send a pic of it, although not much right now. Sorry for the long post on my first one.
I'd love to see what you're up to. Please post some pics!

My front-suspension scheme is hot-rod primitive -- a transverse leaf spring on a Ford V8-60 tube axle, controlled by Kurtis-style 'hairpins.' Steering will probably be R&P, although cowl-mounted steering with a long side drag link is still under consideration. Candidate spindles are early Ford, machined to accept integral hub/rotors from a Porsche 914, with Porsche calipers. Wheels will be 15-inch, eight-spoke Panasport-style -- light, strong, and offering a good range of offset/backspace choices.

This is all part of the premise that goes "HFS Morgan, Frank Kurtis, and Soichiro Honda walk into a bar . . . " Morgan three-wheelers, Kurtis midgets, and just about anything from Honda have been pushing my buttons for much of my life, and this project locks them all together in my idea of a personal transport that I can enjoy and afford in my twilight years.

Mike
 

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I would move up to a GL1500 or a GL1800. the GL1100 were good bikes, but your adding weigh and rolling resistance and possibly changing to a higher gear ratio.thats asking alot of the LITTLE GL1100.Plus reverse. Just my knee jerk thoughts,Good Luck with your trike.
 
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