EFI 2 stroke enduro bike.

[Stylo]

The concept looks good , any idea of the relative HP figures compared to a current 2T and, is there still an old school powerband that makes the current 2T's so much fun ?

[Pornstar]

The concept looks good , any idea of the relative HP figures compared to a current 2T and, is there still an old school powerband that makes the current 2T's so much fun ?

Hmmmmm? Indeed.

[Pornstar]

Are EFI 2 smokers generally less prone to seizing than carbied 2 strokes?

Yes and No really, sometimes on occasion, but practically never.

[eelracing]

http://www.befurious.com/ossa-presen...o-250i-y-300i/

Is the tide starting to turn? If the japs don't hurry up and smell the coffee they may be left behind.

Ossa,Bimota,Fantic and KTM etc are the future,long may they run.

[Jay GTI]

There's definitely some truth in that statement. Not sure about the other brands, they are still rareties in NZ, but certainly over the last few years KTM have made huge in-roads into the NZ market. Back in '06, when I got back into riding, there were a few KTMs around but now you go out somewhere like Woodhill and they are everywhere.

In fact all my riding buddies are on orange bikes now, some merely for the fact that the KTM MX range have electric legs, which I notice none of the Japanese bikes have followed suit with.

[CRF119]

Waiting for direct injection

[noobi]

Waiting for direct injection

I hear this often, why do you say that though?

[flyingcr250]

Waiting for direct injection

Youll be old gray and in a wheel chair wearing a nappy before that happens.......

[CRF119]

Direct injection is far more efficient but the problem is you need to over come the pressure crated by the compression so you would need a 300psi fuel pump to inject the fuel just at the right time.

I am assuming you have all seen this

http://www.youtube.com/watch?v=TE5ENcMH1ZI


I was a told by a engine builder and tuner that a two stroke will always make more power using a carby anyway. He used to build and tune the old 2 stroke road racers at world class level. He also used to make the expansion chambers for them and do all engine mods. He said a good CR500 should make 100hp if it doesn't it was done wrong.

Speedway cars still use carby to

[Jay GTI]

Speedway cars still use carby to

Not really a good comparison, speedway cars are basically tuned for WOT and there is little benefit of FI over a carb if all you're doing is hard on the gas, off the gas, hard on the gas, high revs at all time...etc.

An enduro bike will spend a lot more time on part-throttle, holding revs at a constant (ish) for short periods, running at low revs in the tight sections etc. This is where a carb cannot compete (guess I should throw in emissions here as well, not that I care about my carbon footprint...).

[CRF119]

You are right, i was only going for overall HP. Other advantage is easy tuning.

[Crasherfromwayback]

I was a told by a engine builder and tuner that a two stroke will always make more power using a carby anyway. He used to build and tune the old 2 stroke road racers at world class level. He also used to make the expansion chambers for them and do all engine mods. He said a good CR500 should make 100hp if it doesn't it was done wrong.

Can you ask him why then, it was Ito's NSR500 featuring fuel injection that was the first 500cc two stroke GP bike to go over 200mph?

Also, a CR500 will probably never do 100hp, purely because they'll only rev to around 7500rpm without flying apart. 80 maybe. But they sure as hell won't last long.

[avgas]

Also, a CR500 will probably never do 100hp, purely because they'll only rev to around 7500rpm without flying apart. 80 maybe. But they sure as hell won't last long.

My RG150 had 34 at the wheel after some boffin went nuts with it. But your right. It only lasted another 5,000 km then exploded.
Big end bearing came out like finely crushed flour. Piston rings were almost non-existent. Conrod had cool 15 degree bend.

But I am still looking for my 1L 2T...... someday

[Crasherfromwayback]

My RG150 had 34 at the wheel after some boffin went nuts with it. But your right. It only lasted another 5,000 km then exploded.
Big end bearing came out like finely crushed flour. Piston rings were almost non-existent. Conrod had cool 15 degree bend.

But I am still looking for my 1L 2T...... someday

Hahaha...yep. My 92 Honda RS250 did 82hp, but was hungry for parts when tuned like that, and revved to 12000rpm. But a big single like a 500 two stroke, has a really long stroke and they hate revving. When I road raced KX500's, I put a piston in it every time I raced it, as they used to start cracking pretty early.

[Reckless]

Looks like its here and waiting they prob have want to sell a few 350's before they hit the market with the next new development?
Heard they have been working with Rotax for quite some time on this.
Waste of time doing all the 350 MX and Exc stuff if smokers might come back and blow everything else away.
They probably can be fairly confident that no one else of any consequence is putting any time into 2smoke development so why not sell as many 4 strokes as you can while you can! Especially when The 300 exc is the biggest selling 2 stroke in the market and they pretty much have the smoker market to themselves. There's no pressure on them to bring new stuff in at all.



Quote from Rob Twyerould, technical guy for KTM Australia, taken from the July issue of Australasian Dirt Bike:

"There is definitely a well-developed prototype at KTM, but they are waiting for the next round of emission restrictions to be announced before pushing forward.

"KTM has developed and patented it's own mechanical fuel pump system and a very compact oil delivery system to the bottom-end bearings, and the whole bike works really well.

"While there are some reasonable performance improvements, the real advantages of the system are in emissions and fuel economy. So the motivation for bringing to market will only come with the new emission targets."


From what is said above does it mean no more mixing fuel as the bottom and has separate oil delivery thats not a real 2 stroke??

He talks evasively about 2 strokes at about 4:30sec mark in this Vid.