Air-cooled rotary project: Matterhorn

It runs premix....it doesn't have crankcase oil. It takes the air/fuel/oil through the intake and through the main bearings into the combustion chamber. In essence, all rotary engines are 4-cycle in design however this one is quite unique. At 25:1 according to an older manual, that's about 18oz per tank....to be on the safe side, 20oz per 448oz(3.5 gallons). That's about 2/3 of a quart of 2-stroke oil on each full fill-up. Later models called for a leaner 40:1 which seems more reasonable at 11.2oz per 3.5 gallon tank. (1/3 of a quart) I'm glad you brought that up because I hadn't put the numbers together. I'm considering a creative and clean way to somehow inject that oil into the tank on each fill-up.

~Alex

Tank is done, it has been pressure tested.




Thanks Jeff O for such a great job.
~Alex

tits

Update?

Nothing as of late...I will update as soon as I can.

~Alex

I'm considering using 3/4 .120 wall DOM tubing for axles. The donor bike has hole axles as it is. Opinions?

-Alex

Originally Posted by Alexander

I'm considering using 3/4 .120 wall DOM tubing for axles. The donor bike has hole axles as it is. Opinions?

-Alex

If your going for an axle Id step up the wall thickness.
I am not positive, but I think axles are somehow trued, or machined? to be perfectly strait? Maybe....well, I drove all summer on a bike with a bent axle. I think it will work, just be really careful if you weld on it to pre heat with a torch, weld it, then keep the torch on it and keep it hot for a few min, then wrap it in heat blanket or bury it in sand so it cools very slowly so you do not temper it at all.

I found some 3/4" OD DOM tubing with a .188 wall for a reasonable price. I think that'll serve well as an axle. I've ordered the parts for essentially an oil tank with a built in metered piston hand pump to dispense exactly the right amount of 2-stroke oil directly into the tank upon a full fill-up. It'll be all self-contained within the oil tank and simply have a knob/rod on the side that'll pull out(filling the internal cylinder) and push in(sending the oil directly into the gas tank). This tank idea will be well documented and perhaps a build thread assembled. I'd love to share this. I've always wanted a clean way to mix pre-mix fuel without the tedious nature of traditional methods involving either an external red gas can or pouring a plastic bottle of 2-stroke oil directly into the tank and guestimating how much is needed.
~AJ

Made some progress today.
Mounted the tank, fender, sissy bar and jackshaft.

Righteous! Although, I would have waited until the new wheel set up was on to mount the fender. Looks rad. Dj does good work.

That is so fucking cool! Can't wait to see that thing done.

i bet that thing is gonna run like a bat out of hell

I hope I haven't totally screwed myself...but I just realized something today. I took a look at this stock sled:
and I've realized that I've mounted my driven clutch backwards from how it was originally oriented. I'm assuming that it will not work in this direction. Anyone with snowmobile/CVT experience?



TIA, Alex

Looks fine to me? I don't understand the concern?

The front of the sled is on the right. It's appears fine to me.....until it blows up!

Originally Posted by Beau

Looks fine to me? I don't understand the concern?

The front of the sled is on the right. It's appears fine to me.....until it blows up!

Whoa. That's a two rotor! Did those come from the factory like that???
Want to sell that 606?

Not mine. Just a photo I found online. I wish I had it

http://www.youtube.com/watch?v=oTrAtlIkkxs

That seems to run a different clutch than mine. I'm going to flip that clutch around. The ramps on it aren't designed to spin the other way.
Alex

I guess I need a better picture. Did you put the clutch on the jackshaft?

Yeah...the clutch has been slid on the jackshaft but it isn't a big deal to turn it around. It is simply a 3/4” shaft with a 3/16” keyway originally from a mini bike. The issue is the offset from the drive clutch. If I need to reposition the jackshaft carrier bearings/assembly it can be cut off and re-welded. Upon further research it WILL need to be switched.
Up next: fab an intake to mount a VM30and build some bars.
-Alex

bm30