Final Thoughts Comparing 2 stroke vs 4 stroke outboard motors isn’t about which engine type is better. It’s more about determining which engine type is better suited to your needs. They each have ...

Wärtsilä has announced the results of extensive testing of its 4-stroke ammonia engine, which demonstrated a reduction in greenhouse gas (GHG) emissions by up to 90% compared to traditional ...

Naoki Okanishi, Itaru Fukutani, Eiichi Watanabe, Torque Boosting of 4-Stroke Cycle Spark-Ignition Engine in Low and Middle Engine Speed Ranges by Crankcase-Supercharging, SAE Transactions, Vol. 93, ...

Wärtsilä’s 4-stroke engine-based solution for ammonia fuel now delivers higher than ever levels of efficiency and performance. Following its introduction to the commercial marine sector in ...

The Rotating Cylinder Valve (RCV) Engine is a novel 4 cycle engine that is a practical alternative to conventional 2 and 4 stroke designs, in particular for small capacity single cylinder applications ...

First and foremost, 2-stroke and 4-stroke are terms that refer to the length of the engine cycle. To better understand what these terms mean, we need to start by clearing your mind.

On a 4 stroke, the piston will travel from TDC to BDC four times to turn the crankshaft one time around during a combustion cycle. On a 2 stroke, the piston will travel two times to do the same thing.

But [Integza] wanted to see what happens inside a 4 stroke engine, and it wasn’t enough to see it from a transparent cylinder head. No, he wanted to see it in the cylinder itself.