Gearbox Mounted 💪 

Can't wait to hear this thing run

Can't wait to hear this monster. Thanks for sharing :)

I was thinking about it more, the crankcase pressures will probably be very high, with the comparatively small ventilation hoses. On a radial engine there are always pistons going up when going down, so that's not a problem... a engine compression tester is a gauge with valves, for peak value readings, so connect a compression tester to the crankcase. Connect it directly to the crankcase, maybe off the vent hoses, but immediatly next to the case. That will tell you exactly how much pressure the crankcase experiences. (with the single vent filter, i bet you'll see peaks over 40psi when idling, worse with loose rings, but that # has nothing printed to verify it, it's just a guess from my experiences with many cars)

You will need some sort of adjuster to lock the gearbox, otherwise chain torque will pull it

Must have a mind melting amount of torque to need two chains. That back tyre is going to be toast

love the videos

Great work,

nice work 👍

Check the physics, your gearbox will pull back towards the rear wheel as your gearbox sprocket is smaller than your clutch, this happened on my pre unit British bikes. They would pull up the primary tight, stopped it when I would wind the play to push the box away from engine. Worth looking out for.

Nice

Great progress! Enjoyable to be this close, couple of OBS if I may … top of gearbox , maybe a stud between both sides with a solid spacer added rigidity? Possibility of a modern coil pack ( ugh) the advantage is you only have to route small signal cable(s) as the coil sits on the plug(s) have used ones from Ford Fiesta before , probably even smaller now. On a previous turbo bike build I used some nice st/st 303 pipe to form a conduit , there was enough room to run an oil supply pipe and two sensor cables inside .

UNF is a great shout. Metric mounting bolts vibrate loose with the coarse pitch. Unless you use nylon nuts etc. have you considered torque pull on the primary? Is there enough friction to hold the gearbox in place? On a pre unit triumph for example they have adjusters, similar to the chain, to hold the gearbox in position and allow adjustment.

Just tuned in.. WTF IS THAT..!!! WOW.... Made in England baby....

With the government trying to bring in type approval owning and riding custom builds may be a thing of the past , get your beast running before it's to late....

Oh, that’s pretty cool. What kind of motor is that anybody answer?

2 different chains running 2 different speeds are going to wear at 2 different rates. You might have them close right now, but after only a bit of running time you won't be able to get an acceptable adjustment on both simply by moving the rear wheel. You need to have a chain idler/adjuster on each chain run. Oh, I forgot, this is just a show piece and long term service really isn't a consideration at all. Never Mind. 😉

Why are you using 2 chains? If i may ask? To keep it straight with all that torque?

Such awesome work, it's a shame it's being built into a chopper though.

What kind of gear box or transmission is that

what are your plans for brakes?

Wot kind of engine is that?

Hi, mucho impressed! 1 question, is that a belt drive Commando clutch?