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Porsche's idea for a six-stroke internal combustion engine

This is a patent from Porsche that shows how a six-stroke combustion engine might work, creating more power while also improving efficiency.

With very few exceptions every combustion-powered car uses a four-stroke engine: intake, compression, power, and exhaust. Documents filed with the US Patent and Trademark Office specifically describe this as "six individual strokes that can be divided into two three-stroke sequences." It's certainly an interesting idea, but perhaps more importantly, it suggests Porsche is working very hard at finding ways to keep combustion engines alive amid the push for electric power.

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