Is There Still Room to Improve ICE Technology?

Here's how long-time Slashdot reader Baron_Yam summarizes a radically new tiny-but-powerful "opposed-piston engine" created by INNengine of Granada, Spain. "500cc, 120 horsepower, under 40 kilograms (85 pounds). No cylinder head in the motor, no camshaft, no crankshaft, no valves, and no oil mixed in with the fuel."
The company calls it "a single-stroke combustion cycle," though the engine itself still has a compression stroke and an exhaust stroke, reports The Drive:Despite having four cylinder