TWO STROKE no smoke coming soon

[mossy1200]

Two strokes will be back passing euro three standards with air injection and 200hp light weight engines with more torque than 4strokes.

http://twostrokemotocross.com/2009/0...s-strike-back/


http://www.twostrokeshop.com/

This is good reading

[scott411]

very interesting reading, good to see people have not given up on the 2 strokes

[bogan]

Awesome, i had heard rumors of direct injection two strokes a while ago, great to see theyve done something with it. Will we see two strokes back in the MotoGP main in a few years perhaps?

[gatch]

mint, 1000cc v-twin 2 strokes, I've got a boner just thinking about it..

[Macros]

Awesome.

If Belladonnas can have euro 3 it should be easy enough for KTM.

[bogan]

After thinking bout it some more, why are the power figurs for this design so far down from older two strokes, 250cc two get compares to 450cc fours, but they are comparing 450cc twos to 450cc fours, granted the twos are ahead, but not by as much as they used to be. Whats going on? if the new two stroke designe doesnt ride like classic two strokes, nsr's kr1's etc itll be somewhat of a letdown.

[mossy1200]

After thinking bout it some more, why are the power figurs for this design so far down from older two strokes, 250cc two get compares to 450cc fours, but they are comparing 450cc twos to 450cc fours, granted the twos are ahead, but not by as much as they used to be. Whats going on? if the new two stroke designe doesnt ride like classic two strokes, nsr's kr1's etc itll be somewhat of a letdown.

I think that the aim is 2stroke 600s and 1000s with high horse low weight and massive torque that dont blow smoke.Your not going to want old school power band style power with 200hp.
Check out the rs500 in the second link for the 124kg 112hp low tune road version low smoke double cr head version.

[bogan]

I think that the aim is 2stroke 600s and 1000s with high horse low weight and massive torque that dont blow smoke.Your not going to want old school power band style power with 200hp.
Check out the rs500 in the second link for the 124kg 112hp low tune road version low smoke double cr head version.

yeh good point, spose im just used to 125 and 250cc two strokes, if the fuel injection system can work with these and leave a decent powerband ill be happy as a pig in mud.

[sil3nt]

Awesome read. Would be good to actually have something happen in the next few years though.

[NZsarge]

Good to see two smokers are'nt dead and buried just yet, has fuel consumption and higher engine wear been addressed too?

[mossy1200]

Good to see two smokers are'nt dead and buried just yet, has fuel consumption and higher engine wear been addressed too?

The injection of the charge happens after the exhaust port is closed, so none is lost, and because the air injection is so effective at atomising the fuel, injector pressure can be lower – meaning the injector themselves can be cheap; far cheaper than the diesel injectors in your car which run at up to ten times the pressure. Orbital’s computer-controlled ADI cuts oil consumption by 80% and fills out the two-stroke’s torque curve to four-stroke-beating levels. It also dramatically reins in fuel consumption, as Mike Ambler - project leader in Aprilia’s engine department when the firm secretly tested ADI on its RS250 - remembers: “The ADI-equipped RS was so efficient that it could run on the tailpipe emissions of the regular RS250 at idle”.

One would assume because the oil is injected with the exaust port closed and no longer as a fuel oil mix that the lube on rings would be improved.

[R6_kid:Me]

I found this part interesting...

Jialing / Mira
China’s state-owned giant Jialing Motorcycles has contracted New Zealand engine R&D firm Savice to develop a suite of new direct-injection sub-250cc two-strokes designed to leave Europe and Japan’s rivals feeling heavy and flat. And the deal is a two-way street, with Jialing manufacturing Savice’s line of Mira-branded two-stroke bikes (www.miramotorcycles.co.nz) with further projects already sketched out, taking advantage of Jialing’s huge economies of scale. Managing Director Denver Lawson says: “We’ve got a 1000c two-stroke V-twin modelled (dyno chart shown) that’s good for 22obhp while still running Euro-3 compliant, a 62bhp 125, a completely new technology diesel two-stroke scooter engine, new piston designs allowing us to run up to 11,000rpm, split intakes… There’s a lot going on,” Of the v-twin 1000 Lawson promises “A turn-key V-Due”.

[Spyke]

this is going to be awsome!!!

[Motu]

I think Orbital have held back the development of 2 strokes for the 20 years or so that they have held the patents to direct injection.No one is going to think up and develop new ideas if someone says ''It's already been thought of,and you have to pay them huge amounts just to keep thinking.''

Anyone can do this,it doesn't have to be Orbital alone.The technology is there,and has been there for a long,long time - get out of the way Orbital and let the big boys in.

[Spyke]

Orbital’s air-assisted direct injection technology (ADI) separates oil and fuel, keeping oil out of the combustion process and surrounding the fuel vapour in a plume of air which allows clean combustion in the short time the two-stroke cycle allows. The injection of the charge happens after the exhaust port is closed, so none is lost.

Does this render the expansion chamber useless as all the fuel burns in the cylinder?