Donor Gearboxes

[el chupacabra]

I could make something integral to the cassette, I’ll have a play around when I get a minute as I have a few Honda c50 oil pumps around and I could run the parts in the cassette. Maybe running a plastic drive gear off of the transmission.

I’ll have a think about what I can do with the yz units too as they look fairly simple to implement.

That rgv cassette does have a pump I could use but I want to make it out of parts that aren’t unobtanium.

[husaberg]

I could make something integral to the cassette, I’ll have a play around when I get a minute as I have a few Honda c50 oil pumps around and I could run the parts in the cassette. Maybe running a plastic drive gear off of the transmission.

I’ll have a think about what I can do with the yz units too as they look fairly simple to implement.

That rgv cassette does have a pump I could use but I want to make it out of parts that aren’t unobtanium.

Rob from ESE was doing some stuff with these sort of pumps, not sure what he ended up doing.
they squeeze a tube

[Kickaha]

Maybe the electric route is not really any simpler and won’t provide enough flow.

They flow enough for F1 sidecars running 200hp, thermostatic controls and can be set for a warm down period after you stop

[el chupacabra]

I'm yet to make up my mind on the water pump situation but I have stared mucking around with integrating the Honda/Lifan pump into the cassette.

can anyone here tell me if the modules used in gearboxes are standard sizes or will they be all over the place?
1st gear on the output is 37 teeth and has an OD of 98.35 and a minor diameter of 88.2 this gives a module of around 2.54, the reason I need to know this is so I can manufacture the drive gear for the oil pump possibly from nylon or some sort of plastic. I've really answered my own question but maybe there's some handy tricks i don't know.

Here is a possible location for the pump. I'll relocate the bolt holes slightly further apart.

[husaberg]

I'm yet to make up my mind on the water pump situation but I have stared mucking around with integrating the Honda/Lifan pump into the cassette.

can anyone here tell me if the modules used in gearboxes are standard sizes or will they be all over the place?
1st gear on the output is 37 teeth and has an OD of 98.35 and a minor diameter of 88.2 this gives a module of around 2.54, the reason I need to know this is so I can manufacture the drive gear for the oil pump possibly from nylon or some sort of plastic. I've really answered my own question but maybe there's some handy tricks i don't know.

Here is a possible location for the pump. I'll relocate the bolt holes slightly further apart.

You can check by adding the tooth counts if they all add the same or close you can assume they are all the same.

Kawasaki used something like 4 modules in one gearbox for a Kr250
Bradleys book has some excellent stuff on gears.

Fletner her makes them for a living.....
have a look at triumphs part fiche on line you might save yourself making one
Or you can just use chains like Honda did for years.

[el chupacabra]

No dice on the parts list. Hmmmmm. I’ll try and take some more accurate measurements tomorrow, because if I model the gears with .05 backlash I seem to get around 2.565.

That would be a handy book to have.

[jato]

re the tooth form do you know what the shaft center distance is, and the tooth count on ist drive?

[jato]

Acetal - magic stuff - very suitable for lightish duty gears

[el chupacabra]

The shaft centres are 68.05mm between the input and output. 16tooth and 37 tooth

[jato]

just entered 16:37 in my favourite gear calculator - something fishy alright - i recall the shaft centres are 68mm so module 2.5 doesn't work ... maybe there are still a few old school poms in the triumph factory

[husaberg]

No dice on the parts list. Hmmmmm. I’ll try and take some more accurate measurements tomorrow, because if I model the gears with .05 backlash I seem to get around 2.565.

That would be a handy book to have.

i was meaning to look for suitable gears? failing that put Honda gear on shaft job sorted
maybe email Nova and ask for help you never know they might help you.

[el chupacabra]

I’ve sent nova an email, here’s hoping someone is sympathetic to my cause. I’ll probably drop by the workshop doing the gear cutting and see what they reckon but it works out around 2.566

[jato]

... thinking about the c50 oil pump ... does the triumph have a spray bar as std that squirts oil into the mesh of the 6 pairs of gears? add in the feed to the centre of the shafts and possibly your own squirter for the primary gears - the little honda pump may not deliver enough. if Nova don't get back to you, you could cut your own acetal gear using a (imperial) DP10 cutter (equiv to mod 2.54)then do a few mock-ups on the bench to find a centre distance that gives a whisker of backlash and you'll be in business. FWIW a mate once took a bandit 1200 clutch gear to BOp gearcutters and the crusty old guru there commented that if the top of the teeth were trimmed back by 0.4mm or such then you would have a std (and common) mod 2.5 gear, and thats what they would make to run with the bandit gear.

[el chupacabra]

No spray bar that I’ve seen although I could run the oil level so that the gears have a very light splash to aid in lubrication. Probably not ideal for drag or oil life but probably better than not enough oil.

Hmmm I’m sure the old crusties local to me might know something, they have all the gear hobbling equipment and what not. Fingers crossed that someone knows what I need to know because when I make the gear to mesh with the clutch I definitely want the correct module.

[husaberg]

YZR ratio options


plus patton 500gp crank