2-stroke direct injection, the solution that big brands don't want
2-stroke direct injection, the solution that big brands don't want

Much has been said about the disappearance of two-stroke engines. And one of the main arguments that come up when talking about this is that they have a lot of pollution problems, allowing a lot of gases to escape without burning. Gases that pollute much more than those produced by a four-stroke engine. But what happens if we further control the fuel entering the cylinder by means of a direct injection? Well, these emissions are considerably reduced and we could solve that "problem".

Something like this was already used by Honda in an edition of the Paris Dakar, but not much information was leaked from those bikes and it seems that those results did not interest anyone. Because with the passage of time the two times were cornered until the present moment in which they are almost disappeared.

Luckily there are still people who are concerned with evolving these simple engines. And the gentlemen of Athena present us a video of their direct injection system for two-stroke engines. Although in the technical section they tell us practically nothing. They just say that it is easy to install and that improves performance while reducing consumption and emissions. We are going to do a bit of mechanical fiction to see if when we find out about these technical data we have been very wrong or not.

The cycle of a two-stroke engine enters the crankcase, where the fuel containing dissolved oil is used to lubricate the connecting rod end.When the piston goes down, it pushes that fuel mixture through the load transfers to the upper part. cylinder top. When the piston rises, it compresses the mixture, which explodes thanks to the spark made by a spark plug and pushes the piston down again. In this way, the piston discovers the exhaust port and allows the gases (burned or not) to leave the cylinder.

With a direct injection system, the mixture is introduced into the cylinder when the piston is rising towards the cylinder head, which does not pass through the crankcase. Thus, there is no need to worry about the shape of the transfers or the fluid dynamics required to pass from the crankcase to the cylinder head. In this way, a cylinder with this technology only needs one exhaust port to allow the burned gases to escape. The lubrication now has to be different, much more like a four-stroke engine, with its oil passing under pressure through passages until it reaches the critical point. But this oil is not lost along with the gases, but as in a 4-stroke it remains in the crankcase.

With a stroke of the pen achieve two-stroke engine performance with four-stroke engine emissions. Will this serve to green the laurels of the two times? Will it be the solution so that Euro 0 engines can continue to circulate? We'll see, but at the moment this Athena direct injection system looks pretty good.

And above the video has been published since December last year. What are the big brands waiting to include it? Oh, he hopes that with what they have invested in developing four-stroke engines, they no longer have money for anything else.

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