the clean two-stroke thread

[Pursang]

LPDI Injection under the piston can give a stratified push through the boost port, if that works it is quite an advantage if it really works. Can also increase the application to really high performance/RPM applications?

Yes, looks like that. Depending on the volume of fuel injected under the piston, much of it might remain there, trapped by the down stroke. It could cool the piston and small end and return back through the window into the boost port.

Cheers, Daryl.

[Norman]

Yes, looks like that. Depending on the volume of fuel injected under the piston, much of it might remain there, trapped by the down stroke. It could cool the piston and small end and return back through the window into the boost port.

Cheers, Daryl.

Have a feeling that F-TPI, if injected during transfer flow, have more time and is better splitting up the fuel into smaller droplets using the transfer counterflow.

[Vannik]

Neil,

Your YZ250 is mentioned in this video but they do not know what became of it - maybe somebody should put them straight on where TPI comes from?

https://www.youtube.com/watch?v=R1yLUF3aHxQ

[Flettner]

He's too hard to get hold of. I've left a comment so lets see what happens? I have commented in the past but never had a reply.

Anyway TPI is old news now, OP uniflow is where it's at now. Id fit an emoji here but my phone doesn't seem to allow it. Smiley face.

[WilDun]

Yeah, it's pretty soul destroying to see your baby being swept up and carried away in a flood of hype and bullshit and becoming something of a novelty when it is suddenly "discovered" by someone else (not always in a malicious way - sometimes just in ignorance) and developed further!

A typical case is John Dunlop (actually a Vet) who thought he had come up with something new (pneumatic tyre) when in fact someone else, a countryman of his, had already tried it fifty years or so earlier! - his reply was that if he had known that, he wouldn't have bothered! - however, as we all know today he was successful - he then sold his company early and lived a very comfortable life!

Guess that is why we have patents, but then maintaining those patents becomes a separate mission in itself and needs a lot of specialist people around and so it balloons way out of the enthusiast's reach and ends up in the arms of some rich patent collector, who either puts it up for sale or stores it in his back room to wait for the right moment to re-introduce it!

I believe that many true inventors have experienced the same thing.

And then ..... I could be talking crap!

[Flettner]

https://youtu.be/MuvJIoUTA8k

[ceci]

A typical case is John Dunlop (actually a Vet) who thought he had come up with something new (pneumatic tyre) when in fact someone else, a countryman of his, had already tried it fifty years or so earlier! - his reply was that if he had known that, he wouldn't have bothered! - however, as we all know today he was successful - he then sold his company early and lived a very comfortable life! :

Is wrong with evolving or developing projects abandoned by others?.

Guess that is why we have patents, but then maintaining those patents becomes a separate mission in itself and needs a lot of specialist people around and so it balloons way out of the enthusiast's reach and ends up in the arms of some rich patent collector, who either puts it up for sale or stores it in his back room to wait for the right moment to re-introduce it! :

Even the most ridiculous of projects carried out by simple inventor, ends up being patented by large companies that have no relationship with the inventor

[WilDun]

Is wrong with evolving or developing projects abandoned by others?.

No, that's how it is!

Even the most ridiculous of projects carried out by simple inventor, ends up being patented by large companies that have no relationship with the inventor

Yep - sad but true!

Neil, It's much bigger than I thought it was going to be! and I thought it was going to take longer to do! ......... do you really think you can get it in a bike? - all those years of hard slog in your workshop have sure taken a toll on you!

[katinas]

Some time ago, when I was 15 years old, I greased my moped petrol with salad oil (freely obtainable when mum wasn't looking) for that lovely racy smell. Since then, smart entrepreneurs marketed two-stroke oil smelling of strawberries, so your donut smell shouldn't be a problem either. But why should it need to extract CO2 from the atmosphere. That's a job for trees, isn't it?

This fun story is reminiscent me youthful times too, when it was very difficult to find proper oil for 2t in Soviet land. Only rarely, I don't know how, it was possible to find an aviation synthetic oil MC 20.
But once, by accident, I read that red drum brake fluid BSK, consists of 50 percent butyl alcohol and 50 percent refined castor oil and it was sold in all auto stores in packs of 1 liter!!! The smell of butanol was awful, but exhaust ..........
Nowadays, it is still used in tractors, but in plastic package.

Add pic of 1982 patent very similar to DiTech and other............most complicated two stroke piston.

[ceci]

Add pic of 1982 patent very similar to DiTech and other............most complicated two stroke piston.

Hi Katinas

You can put more images of the patent of the pneumatic injection system. Thank you

[Flettner]

Neil, It's much bigger than I thought it was going to be! [/QUOTE]

HA HA, yes, not something Im proud of.

I've used 100mm rods for a 48 stroke and the cranks are just standard AG 100 units. If I got serious I'd optimise all these components for size and I've got plenty of room to drop the bottom crankshaft lower, next time. I just want it up and running for evaluation. There is also plenty of room up top as the frame is a perimeter type. It will fit.

[Flettner]

Katinas, those spherical sealing rings intetest me, last picture. On the outside pushing in to seal. I wonder how much real world work has been done on this.

[WilDun]

Sure is complicated! - and throwing a rod would be a major catastrophe!! - there are so many problems already with small end bearings and conrod failure, it's hard to imagine how all those parts would fare at 10,000 revs!
But nevertheless, its clear that there has been a lot of thought gone into it! - and the cam idea - great!
(what the hell is it anyway? ) .........

Katinas - That stuff sounds almost drinkable! - if they changed it to Ethanol instead, sales would go up by 100%! - but I must say that way back in the day, half of the enthusiasm for racing machinery came from the beautiful aroma of burnt Castor oil!

[TZ350]

Neil,

Your YZ250 is mentioned in this video but they do not know what became of it - maybe somebody should put them straight on where TPI comes from?

https://www.youtube.com/watch?v=R1yLUF3aHxQ

I have added a few links on their YouTube page to Flettners EFI bikes.

First startup 7 years ago. Well before KTM:- https://youtu.be/hOGZ5llowoU
On the Dyno:- https://youtu.be/UEQli7nuak4
And an old F5 Kawasaki converted to EFI:- https://youtu.be/eleqBGvOM4M

[husaberg]

This fun story is reminiscent me youthful times too, when it was very difficult to find proper oil for 2t in Soviet land. Only rarely, I don't know how, it was possible to find an aviation synthetic oil MC 20.
But once, by accident, I read that red drum brake fluid BSK, consists of 50 percent butyl alcohol and 50 percent refined castor oil and it was sold in all auto stores in packs of 1 liter!!! The smell of butanol was awful, but exhaust ..........
Nowadays, it is still used in tractors, but in plastic package.

Add pic of 1982 patent very similar to DiTech and other............most complicated two stroke piston.

Lkely sold the rest of the hulls to the KGB .