Future of Two Strokes

[skid jackson]

4T noise is a big issue here in the states. No honda 125 2t's state side either. Don't think they are shipping the 250's either but not 100% sure on that. I believe you can still get yz 250 2t's. The woods racers in my area love the yz.

[gasgasman]

Here's some great info on Direct injected two stroke engines.

http://www.orbeng.com.au/orbital/flash_index.htm

[TooFastTim]

Looks like Aprillia have it right: http://www.speed-sports.com/motorsco...rs/ditech.html

[kim]

We discussed the 2T fuel injection stuff on the smackover forum a while ago and Jim was saying that one of his mates (who works for a snow mobile co) had converted his KTM200 to fuel injection based on the snowmobile injectors and mapping/software.
Apparently the bike is running well with no issues.

It would be awesome to just dial in the jetting.

And it would in my opinion make a strong sales point for a 2T, both being more "green" but also provide more miles per gallon.

Might be lighter as well, but not sure on that one.

The company that introduces the first model and get approval for street legal use in the states, is going to be counting a lot of money as it is still the preferred bike for a lot of racing dudes, especially when the going gets tuff.

So hurry up GG

Cheers
Kim

[d2w]

Not trying to hijack this thread from a discussion of future two strokes, but I remember reading about a (Colorado-based, I think) company working on electro- or pneumatic-actuated valves for four-strokes. Basically, no timing chain or cams. Combine that with fuel-injection and you'd have a totally programable engine system. Now throw in Windows to control it all and you're screwed (as you'd have to reboot your motorcycle every 20 miles) ;-)

[TooFastTim]

Originally Posted by d2w

Not trying to hijack this thread from a discussion of future two strokes, but I remember reading about a (Colorado-based, I think) company working on electro...actuated valves for four-strokes.

Yeah, Lotus said they got that right a few years ago.

[Magellan]

Originally Posted by GregM

Because a two stroke needs fuel injected on the compression stroke, you need a much higher pressure system than you do on a four stroke that gets injected on the intake stroke.
Greg

Seems like you could just inject into the case during the compression stroke. With a fast blast, you could probably get a bigger charge than with reed valves.

[gasgasman]

Using the crank case injection version, you would have to fire the injector on the down stroke of the piston.
The mixture will then be forced up thru the transfer ports to the combustion chamber.

The reed valves prevent the fuel mixture from blowing back into the intake when the piston is traveling downwards.

[kim]

How does 2 stroke diesels work ?
When do they inject fuel into the chamber ? and what part of the chamber ?

I also read the stuff about the valves, but didn't they have some issues in formula one with electric valves ?

All very interesting

[Bandit9]

Once 4 stroke sales flatten out for a while, then the "new" generation of "greener" 2 strokes will be introduced. So the short term future is no good for 2 strokes, however long term, it will be bright. IMO.