About 20 years behind.So I just bought a new trimmer. Stihl FS111MD
I just used it. I was shocked. This isn't a 2T!!!
They made a 4-stroke that burns mixed gas?? Am I that far behind on these things?
I’ve had the “forced induction” thought on these before but was afraid to say it lest I sound like an idiot!By the way, while those 4mix engines are not really "ultra high performance" they are an interesting concept and can run exceptionally well.
Interestingly, this kind of design can supercharge itself as the crankcase can be used to draw in air/fuel, every time the piston moves up, just like a two stroke. But the intake valve opens in conventional 4 stroke manner. Meaning it can have two volumes of air pulled in for each intake valve opening. The result is 7 psi of boost at full power.