It's only a matter of time...

[flyingcr250]

hope this article isnt too old,

2T injection isnt far away???

http://twostrokemotocross.com/2009/11/revolutionary-new-two-stroke-ossa-tr-280i/

[scott411]

i have never understood why kawasaki and yamaha who both have 2 stroke direct injection on marine appilcations have never gone this route,

i am sure a 300 2t electric start with DI would sell very well, as would a 150-200cc version

[motor_mayhem]

http://www.twowheelsblog.com/post/3955/new-ossa-tr280i-trial-bike-available-from-august

According to this they should have been available since last August.

On their factory website they seem to have an importer in NZ.

http://www.ossamotor.es/EN/importadores.php#

[cheese]

Wicked. I want one!

[Jay GTI]

As article, of bike of trials and injection of 2T directly, good.

[K6K]

one of the magazines is trumpeting this as the first 2T with Direct Injection which it is not, though 'indirect' fuel injection would be pretty good. I like this more for the motor layout, having the fuel intake at the front with the airbox at the top of the tank would be very good. And having the expansion chamber protected behind the motor and within the frame would be a big plus.

Will a 2t direct injection motor still need an expansion chamber? it doesn't need to use the returning combustion wave to stop the fuel/air mix coming out with the exhaust as it won't inject the fuel until the piston closes the exhaust port? It doesn't matter how much air flows through after all the exhaust gas has exited.

[scott411]

Will a 2t direct injection motor still need an expansion chamber? it doesn't need to use the returning combustion wave to stop the fuel/air mix coming out with the exhaust as it won't inject the fuel until the piston closes the exhaust port? It doesn't matter how much air flows through after all the exhaust gas has exited.

good point there, had not thought about need for an expansion chamber,

trials bike's never have a expansion chamber because they are after torque down low and not the top end that an expansion chamber brings,

[K6K]

i have never understood why kawasaki and yamaha who both have 2 stroke direct injection on marine appilcations have never gone this route,

i am sure a 300 2t electric start with DI would sell very well, as would a 150-200cc version

I know I would buy a 300, or even a 200 if what I hear about 2t DI power is realistic. I think they are not doing it because of the licensing costs and because they don't have to do it (enviro or regulatory etc)

The cost of licensing the same DI system that is on the marine and snowmobile applications must be a lot more than running carburetion. The actual additional hardware cost over a normal 2T cant be much more than a fuel injected 4T over a 2T. I would guess the DI needs at least a couple of oil injectors for the crankcase, an oil pump/plumbing and associated direct fuel injection (ECU etc + a throttle body to control the air intake).

Old skool 2T must be a lot more profitable than the 4T's. These days in the states the unchanged for several years YZ250 2T is several hundred more than the YZ250F 4T!

[BM-GS]

Will a 2t direct injection motor still need an expansion chamber? it doesn't need to use the returning combustion wave to stop the fuel/air mix coming out with the exhaust as it won't inject the fuel until the piston closes the exhaust port? It doesn't matter how much air flows through after all the exhaust gas has exited.

The joy of a 2T engine is when all that fuel/air goes out through the cylinder into the expansion chamber, dragging along a load of extra charge, and it gets jammed back into the cylinder by the pressure wave bouncing back! I hope they have that bit programmed in! No point in ignoring a 2T's built-in turbo... Of course, if it's all programmable, you should be able to open/close all kids of valves to build up the off-the-pipe bits of the power curve too (and make it as heavy as a 4T).

[salts]

it is a wonderful thought, but do we want it? how much extra torque will we get with DI? will it make 2t bikes competitive with the 450s again? does anyone have figures on the rotax 2t E-TEC engines that are going in sleds? i know that they destroy the 4t sleds, but what wouldn't an 800cc 2t rip apart...

if its not going to add awesomely then i think id rather spend the extra cash on better pipes ect to go faster.

Also manufactures make more money off 4ts so i doubt they are going to create a less profitable alternative.

plus i really love the simplicity of premix and carbs (in before rejetting ect ect) and that sweet sweet smell :drool:

just my 2c

[Buddy L]

I’m sure that every manufacture of, off road 2 stroke motorcycles, would have looked into the idea of going down the route of fuel injection.
Its all a money thing I guess, if its not going to make money, then pass on the idea.
What wins on Sunday, sells on Monday. And at the moment 4 strokes are winning in the Motocross events, which I presume is there biggest market.

But I would still like to have in my stable a 125 fuel injected endro bike with a (lazy) electric start!!!!

[salts]

yea i hear that, id buy one too. its only yamaha i fear who could still do it though, i dont think ktm likes fuel injection much. im going to pray almost every week and send fan mail to yamaha so maybe by the end of the year when i have saved enough for my new bike they will have released a 2t 125 di... i loved the sugestion of making the rear facing cylinder to protect the expansion chamber too...