diesel rear drive unit

dr pepper · Post by **dr pepper** » Fri Jun 27, 2008 6:40 am

hi chaps i'm a newbie.

I'm planning a trike with with a kubota engine, and i know this is a question you lads have probably been asked a million times, however here goes.
my design so far uses a kubota d902, and a metro gearbox mounted 'inline' with a welded diff, final drive going to a xs1100 transfer box bolted direct to the rear wheel (single rear wheel, rear wheel drive).
I've seen a couple of designs floating about, what is the typical layout, it looks like a mod to the xs middle box to connect direct to a car wheel, with what looks like a sierra rear wheel bearing hub.

Post by **Fiddler** » Sat Jun 28, 2008 12:33 pm

Hi Dr,

Sorry mate, ive no relevant experience to help with your questions but welcome to the forum and keep us posted with your progress.
Hopefully someone can chime in soon with some tips.

dr pepper · Post by **dr pepper** » Sat Jun 28, 2008 1:00 pm

thanks, i found out from ratbike's that the rear drive unit is a xs1100 middle gearbox, with substantial mods, not sure what the mods are, so thats the next mission.

Mouse · Post by **Mouse** » Sat Jun 28, 2008 4:57 pm

Is this a reverse trike with a single rear wheel?

dr pepper · Post by **dr pepper** » Sun Jun 29, 2008 11:10 am

Yep certainly is, before any suggestions of just using a metro or similar front subframe and have fwd, this is not my plan.
My design is to have 2 front wheels probably from a bedford rascal, as this uses a one piece susp/steering unit, and have a 2 side by side seat arrangement in between, then put the engine behind the seat, with transmission and rear wheel behind, on a swing arm.
there are various options, however the most logical so far, for ease of obtaining is a kubota d902 engine connected to a rover metro r65 gearbox, and a rear drive assy on the swingarm.
the rear drive i was asking about is actually a xs1100 middle gearbox, which has been modded, one end blanked with a plate and the other has a cx500 rear drive attached, adapted to a car wheel and fiesta front wheel bearing, not quite sure how, i still need to find this out.

hope that pretty much explains my intentions.

pietenpol2002 · Post by **pietenpol2002** » Mon Jun 30, 2008 5:20 am

Would a Honda CB900 sub-transmission work in your layout? The advantage would be the integral 2 speed gearbox which could function as an overdrive (or double the available ratios in the existing trans). The picture in the example below shows the assembly upside down to how it's mounted in the bike. Don't be fooled by the price. Others are listed here in the states on Ebay at $9.95.

http://tinyurl.com/4nkkl4

Or if you're producing power on par with a Jaguar V-12, you could keep the XS1100 gearbox (as in the example below) and dispense with the transmission altogether.

http://www.custommettle.co.uk/gallery2e ... itemId=720

Ron

dr pepper · Post by **dr pepper** » Mon Jun 30, 2008 2:32 pm

thanks for that, the cb900 is something i have never seen before, i thought the blade just had one box, i dont think that is of use to me though, as i want to fit the thing on the wheel itself, so it has to be compact.

the photo of the jag v12 is actually usefull, never seen as good a view as that before.

sbrumby · Post by **sbrumby** » Mon Jun 30, 2008 10:58 pm

I saw this at the Bulldog last year, In my view it is just for display, the 90deg drive you could hold in your hand & the chain not as beefy as most bikes have, that said it was a good excersize in welding.

dr pepper · Post by **dr pepper** » Tue Jul 01, 2008 4:42 pm

do you not think that the xs's 90 box isnt up to the job?, the xs1100 has a fair old torque output, one of the links above is one of these fastened to a v12 jag engine, that'll pull a bit.
its a small unit, however its sole purpose is to turn drive through 90, absorbed energy will be minimal with only 2 gears at a 1:1 ratio.