Husky developing DI 2T ?

[drewMember]

found this over on TT……

http://www.cycleworld.com/2012/08/13/two-stroke-resurrection/

hopefully one of the brands does something about this soon! rather than waiting ‘until there is a need in the market’.

come on KTM lift your game!

[Peter HornMember]

Jeez I’d love to get my hands on something like that …. wheres Huskybloke…

[peteMember]

Iva wrote:

Jeez I’d love to get my hands on something like that …. wheres Huskybloke…

Huskybloke ? Or do you mean KTM2smokebradCRgregdavidcecil :laugh: :laugh:

I think Ossa has there injected 2t coming out next year, a 250 and a 300.

But more is good I say.

PTW

[Peter HornMember]

pete the wulf wrote:

Iva wrote:

Jeez I’d love to get my hands on something like that …. wheres Huskybloke…

Huskybloke ? Or do you mean KTM2smokebradCRgregdavidcecil :laugh: :laugh:

I think Ossa has there injected 2t coming out next year, a 250 and a 300.

But more is good I say.

PTW

He’s such a brand bitch eh…

[Steve WyethMember]

I didn’t read the article as I’m just baout to jump on the train home. I did notice it said it will inject the fuel late in the cylcle when the exhaust port is blocked. If this is the case and with the fuel inection being electronically controlled why bother with the expansion chamber?

You shouldn’t need to scavenge the fuel as it’s DI and the sonic return wave in the chamber will only ram exhausted gas back into the cylinder on the compression stroke before the port closes :huh:

[drewMember]

there have been EFI ( dunno if DI ) 2T Trials bikes for some years up to 280cc to boot. i think Ossa as well PTW.

[AlexMember]

moto wrote:

I didn’t read the article as I’m just baout to jump on the train home. I did notice it said it will inject the fuel late in the cylcle when the exhaust port is blocked. If this is the case and with the fuel inection being electronically controlled why bother with the expansion chamber?

You shouldn’t need to scavenge the fuel as it’s DI and the sonic return wave in the chamber will only ram exhausted gas back into the cylinder on the compression stroke before the port closes :huh:

Correct.

[peteMember]

xy-transit wrote:

there have been EFI ( dunno if DI ) 2T Trials bikes for some years up to 280cc to boot. i think Ossa as well PTW.

Yeah that’s true Xy, I know ossa make trials bikes but They have an enduro EFI 2T, and I think you can buy one early next year.

I didn’t even know who Ossa was until I read about this new one. :unsure:

I think Moto knows more about them.

PTW

[Scott SouthwellMember]

moto wrote:

I didn’t read the article as I’m just baout to jump on the train home. I did notice it said it will inject the fuel late in the cylcle when the exhaust port is blocked. If this is the case and with the fuel inection being electronically controlled why bother with the expansion chamber?

You shouldn’t need to scavenge the fuel as it’s DI and the sonic return wave in the chamber will only ram exhausted gas back into the cylinder on the compression stroke before the port closes :huh:

It may not have a chamber. Don’t go of the photo in the article this is a photoshop mock up by Cycleworld and not a picture from Husqvarna. Be interesting to see.

Can someone also explain to me (I am a tech retard), if the fuel is now injected into the cylinder how is the bottom end lubricated? Will it be like a 4T with an oil pump?

[peteMember]

Going off the pics Scotty, it looks like the fuel is injected below the piston which still allows it to compress in the normal 2 stroke way.

But I’m a bit tech retarded too, so I think it’s better left to Moto or Axle, they know boats. :laugh:

PTW

[ianMember]

you forgot “Brett” Pete , well the contract for the honda will run out at end of next year and i will be goin back to a registered bike so if they get there a s s into gear it might be on the showroom floor by then

pete the wulf wrote:

Iva wrote:

Jeez I’d love to get my hands on something like that …. wheres Huskybloke…

Huskybloke ? Or do you mean KTM2smokebradCRgregdavidcecil :laugh: :laugh:

I think Ossa has there injected 2t coming out next year, a 250 and a 300.

But more is good I say.

PTW

[drewMember]

going by the cut away of the engine the plan looks like to have the injector and spark plug both in the head.

which means there would have to be some way of lubing the big end if not via the intake port/charge.

the Ossa 280 has a 4T sized/shape header pipe.

[AlexMember]

I’m pretty sure it’s a fuel injector as you know it. It will spray misted fuel directly above piston crown. Spark will ignite as usual and all as the exhaust port is closed so there’s no loss.
As for lube on bearings again I’m pretty sure they will use oil jets to shoot at the bearings like your 4T engines do. There’s no reason they can’t design the c-rod and/or gudgeon pin/bearing to accept oil delivered that way. The only trick is to use as little as possible (emissions) as the air is still moving around the crank and using transfer ports. For example: On BDC the crank at it’s lowest you could position the oil jet literally mm away from the bottom end bearing and use something like a timing cam on the crankshaft to trigger it. Same for the top end bearing: squirt the c-rod face on the downstroke so it runs up the rod to the little end bearing. Something like that.
Oil injection pump/tank like a DT/KDX of old would be a given.

[peteMember]

Ahhhh i see, thanks guys, told you I was tech retarded :unsure: just had another look and it’s the air going in under the piston.

I don’t understand the no need for an expansion chamber if it’s injected.

PTW

[Peter HornMember]

That is correct Axel, the bottom end will be lubricated by direct sprays onto the bearings, reading down the article it states this, but will they spray engine oil (a loss system) or will they spray 2St fuel oil mix on the bearings? I’d sort of lean towards the latter to keep it slightly lower tech on the spray system in which case do we then need an expansion chamber to burn the unburnt fuel…?
F’d if I know, I’m only a scientist, not an engineer! :huh:

[Author]

Posts