Donor Gearboxes

[el chupacabra]

if you wanted to do this this site https://novaracing.co.uk/
go to manufactures and the list options
make them as do other Asian sites but normally for little underbones

They make some nice kit but are definitely expensive and even the close ratio gear set for an sv isn’t as good as the tiger 800. . . Hmmmm maybe it might be getting some British bits, I’ll sleep on it.

I’m all about trying to do this for as little money as possible. In my mind I’m always more likely to finish projects that aren’t a massive financial burden. If I need to spend money though it will happen, I’ll always look for a cheaper option though.

[F5 Dave]

Thailand for most Triumphs. Just sayin.

[husaberg]

Thailand for most Triumphs. Just sayin.

Well I'll admit i never knew that, but i guess lots of poms were not born in England as well Plus if KB's poms are anything to go by were are better off with anything but poms.
https://timeless2wheels.com/14015/tr...thailand-made/
Ducati would be my my first choice i can imagine one lasting long enough to wear out the gearbox...

[F5 Dave]

Had 3. 1050s made by Dave and Rob. Next two by Aisoon and Chao Fah.

Yes I googled that.

[el chupacabra]

I’ll take my chances with Thailand, I mean the cylinders on my RGV Banshee are Chinese haha. But I’m pretty set on those triumph ratios now. I’ve messaged the fella to make sure it is all there and I won’t be looking for bits then I’ll buy it and start the painstaking process of drafting the whole thing. Then printing a prototype. Printing all of the gears and mounting the water/oil pump etc.
maybe I’ll use a GSXR water pump. but gear drive it off the layshaft primary and mount it on the clutch cover.

Then I’ll into casting once I’m 100% sure the design will work and I’ll try get as much as possible done in the casting so I don’t have to do as much machining.

[el chupacabra]

The triumph gearbox will be here tomorrow lunch time, the ball is rolling.

[husaberg]

Well ducks nuts or dogs breakfast?

[jato]

actually it would be interesting to know the wieght of both the shafts with all the gears fitted (no bearings) that info can be stashed away for future use ...

[el chupacabra]

The mans van broke down on the desert road so I should see my gearbox on Monday. Here is a rough layout I quickly modelled to give you guys an idea of what I’m imagining, the number of teeth, the gear width and gear module are subject to change. Once I know I'll be more than happy to share any weights and dimensions.

I'll get my hands on some real cranks before drafting the cases.

[husaberg]

The mans van broke down on the desert road so I should see my gearbox on Monday. Here is a rough layout I quickly modelled to give you guys an idea of what I’m imagining, the number of teeth, the gear width and gear module are subject to change. Once I know I'll be more than happy to share any weights and dimensions.

I'll get my hands on some real cranks before drafting the cases.

Have you seen how a later TZ goes spine gear in side of gear?
will post a pic.
yours is like a TZ750.

[el chupacabra]

No I haven’t, but if you have a photo I’m interested.

Here’s the donor engine.

[husaberg]

TZ750


later tz250's

Shouldn't your cranks also be contra rotating?

[el chupacabra]

Thanks, that looks like ass to machine haha. . . I guess once I know how wide the gearbox will make the engine I’ll be able to decide how much effort I put into making the cranks narrower.

I’m also thinking about if I want to do a 2 piece crankcase with a cassette trans on the sprocket side or a 3 piece case with the vertical stacked gearbox like the triumph.

My philosophy is the cheaper/simpler I can make it the more likely it is to be completed.

[husaberg]

..............

[el chupacabra]

I’ll spin them in the same direction and fire them in pairs 90* apart. I’m pretty sure the RG500 spins in the same direction.