Two Stroke Direct Injection

[guys]

The perfect system for a trials motorcycle (no battery needed)

Yet most brands stick to the archaic carburettor.

The reduced emissions alone, should be reason enough to use this kind of system.

 

[turbohead]

It could be the perfect dirt bike induction system, perhaps for trials, too. I first heard about Athena's efforts 5-6 years ago and it is still in the promising stage, but closer to reality than some of the other systems presented during the 2000's. Ossa is still the pioneer on the trials arena, but I haven'r seen any emission tests or fuel efficiency comparisons. Perhaps others have tried and there could be followers around the corner.

 

Problem is, from a riding point of view, the old carb is still rather good, simple and reliable. The injection systems is better, specially when looking at emissions, but add a bit of new tech, a little unknown to most of us. Having said that, just look at the bikes winning most enduro races today, the more extreme races in particular. If that is a sign of the future, two stroke engines are back to stay longer than most of us thought a couple of years back.

[dadof2]

Some car manufacturers (and specialist engineering companies) have spent very large amounts of time and money trying to get direct injection 2 strokes to produce an adequate combination of emissions and reliability. An indirect injected 2T probably never will be able to meet mass volume vehicle emission requirements. So far none have succeeded. If an engine only has to operate over a relatively small rev range then adequate results can be achieved - certainly an improvement on existing 2T emissions. 

The ossa is an indirect system, the Athena a direct system which is very different.

An off road sport engine, trials in particular will always have to work over a wide rev range. Several car manufacturers are now fitting 8 speed auto boxes to keep their engines in efficient / low emissions operating rev ranges and that is with the advantage of VVT, VVL, complex injection systems.and a pile of computing power to make it all work.