Supermono 1300cc racer project.

[guest1306]

A couple of years ago the British Supermono upped the limit of 800cc to no limit. Ive been frantically working on my new bike to get it on the track, but everything takes time when youve got no cash. However it is looking possible to race it next year. So far the project has cost me £1000, and the same again should do for the rest of the bits i need :- piston, clutch, chain, injectors, conrod , bearings, etc

It`s hand milled billet engine runs with Haltech injection, has a massive intercooler under the tank (which actually acts as the top frame), has triple air reed valve inlets into the engine, and a rotary Cross valve head. The seat unit is just one big pressure tank There is no gearbox, just a Revtech clutch mounted on the crank (no cash to buy yet) hopefully the massive pokey and very low friction (there are only two moving parts in the engine) will overcome the need for such. An expected at least 150 hp @ 6000 rpm with a very flat torque curve. This baby can run on most fuels and has a ground compression ratio of 15:1. Unfuelled weight 140 kg.

Its little brother which i learned so much over the past 17 years is a 500cc with an adapted Godden speedway engine with double crankcase inlets,  holds the flying kilometer on ice record at 96 mph, and plan to de-bore it to 450cc and run next years Manx where new mono rules allow such.

[guest1155]

hells yeah

[Steve Lake]

ye gods!
what power does it make at the wheel?what is the all up weight?

[Steve H]

Ellwood,

I had a quick look at your site to find our where the gearbox and clutch were located and it indicates its a single speed, but I still cant see the clutch, is it mounted on the crankshaft ?

[guest1306]

Both Steves:- I will not be satisfied with less than 150 hp. The British Supermono is the only country/race series which has raised the Supermono cc limits, so thats where i gotta run it. Hoping for debut at Oliver`s Mount Gold Cup race 2012.
When running at the flying K on ice i can run it on Nitro/Methanol so that should more than double the power. The engine parts are overdimensioned so will be able to handle the Nitro brutality.

 A dry clutch will be mounted directly on crankshaft. The whole bike weighs 140kg.

Regards Ellwood

[Steve H]

A dry clutch will be mounted directly on crankshaft. The whole bike weighs 140kg.

I take it then he drive will be taken from the outside of the clutch basket, hence the reason for the massive rear sprocket ?

Steve

[andy230]

Great John, thanks for sharing!

a

[johnr]

A dry clutch will be mounted directly on crankshaft. The whole bike weighs 140kg.

I take it then he drive will be taken from the outside of the clutch basket, hence the reason for the massive rear sprocket ?

Steve

i recon it will be like an old brit bike with the drive to the rear wheel off the back of the clutch basket and the inpit shaft to the basket up the inside of the output sprocket carrier.

[guest1306]

naturally so. gear behind the basket. The bike just gets geared to the track like a speedway bike. that big back sprocket is just there to gear it down to 150 mph.

[JOOLZ]

Amazing piece of engineering

[guest1380]

Silly question, but how have you got your valve gear timed?

From the outside it could easily be mistaken for a chuff off two stroke!!

Much respect due though for the engineering that's obviously gone into the bike and I wish you every success with it in the future.

[guest1306]

I use a Cross vave like this one

http://www.germancarforum.com/tech-talk-forum/18772-bishop-rotary-valve-design-f1-engine.html


But i can also swap from 4 stroke design to a 2 stroke cylinder and head , but theres no racing class if i do that.

[guest1380]

I saw something like this design years ago, but at the time they were struggling to get a good enough seal on the valve gear.

Once again I have huge respect to anyone who can turn out this kind of thing especially on a budget. Reminds me of my late uncle who made a foot long fully working jet engine for one of his model planes. The jet idled at 60,000rpm and stalled at 30,000rpm, but I never did find out what it topped out at though.

Does this also mean you've made a clean burn two stroke? (no two stroke oil)?

1300 two stroke? EEEEKKKKKK!!!!!!!!!!! 

Seriously though I wish you every luck in the future.

[guest1306]

Cheers, I just need to get this baby running for its premier next year, cos i`m 50 then and wanna run it at Olivers Mount Gold Cup.
Its not a clean running 2 stroke, its a dirty 4 stroke- haha. It will always use 2 stroke oil, but i can bleed off a good percentage with a popoff valve.

[guest868]

I am in awe and boggled. Fantastic stuff.