Understanding Porsche's New Six Stroke Engine Patent

Porsche has just patented a six-stroke engine — and they claim it has the power benefits of a two-stroke with the durability and clean emissions of a four-stroke. That sounds almost too good to be true, so in this video I break down exactly how it works, whether the claims hold up, and whether it has any real shot at production. A normal four-stroke runs intake, compression, combustion, exhaust. Porsche's six-stroke wedges an extra compression and combustion into the middle: intake, compression, combustion, compression, combustion, exhaust — two power strokes packed into a single working cycle. The question is how that's even physically possible in a piston engine. The answer is a genuinely clever piece of mechanical engineering. What we cover: THE MECHANISM — how a planet gear rotating inside a ring gear, with an eccentric element, forces the connecting rod's big end along a looping "hypocycloidal" path. TWO TDCs AND TWO BDCs — why the eccentric gives the piston two different top dead centers and two different bottom dead centers, and why that's the key that unlocks all six strokes. THE FULL CYCLE — walking through all six strokes step by step, how the scavenging ports near the bottom of the cylinder work, and why the design likely needs forced induction (the patent shows twin turbos). VARIABLE COMPRESSION — how a worm gear lets you rotate the ring gear while the engine runs, giving live control over compression ratio (and the ability to change the cycle on the fly). THE REAL NUMBERS — two power strokes every three crankshaft revolutions (a 1080° cycle), versus one power stroke every two revolutions in a normal four-stroke. THE BENEFITS — more power-stroke density, more complete combustion, better efficiency, variable compression, and a clever way to dodge knock under boost. THE DRAWBACKS — the complexity, weight, friction, and cost of replacing the humble crankshaft with a planetary gear set (the same problem that's killed every six-stroke since Samuel Griffin in 1883), plus the NOx headache from scavenging excess oxygen. WILL WE SEE IT? — why a patent is NOT a product, and why Porsche might be developing this now, even with talk of a 2035 combustion ban, thanks to e-fuels and performance niches. The patent is real: US 12,123,342, granted October 22, 2024, titled "Method for a Combustion Machine with Two Times Three Strokes." A brilliant reminder that even after 140 years, the piston engine still has surprises left in it. 👍 If you enjoyed this breakdown, hit like and subscribe for more engineering deep dives. 💬 Do you think the six-stroke will ever reach production? Let me know in the comments. — Disclaimer: This video is for educational purposes only and is based on publicly available patent documents. A patent does not guarantee a production product. #porsche #sixstroke #sixstrokeengine #engineering #enginepatent #howenginesworks #automotive #combustionengine #variablecompression #howitworks #cartech #enginedesign #porsche911 #patent