2-stroke VS 4-stroke 6-stroke Engine

Two-stroke engine, four-stroke engine and Porsche 6-stroke engine mechanism comparison 2-stroke engine: 1. Upstroke (Compression & Intake): As the piston moves up, it compresses the air-fuel mixture in the cylinder. Simultaneously, the vacuum created in the crankcase draws a new air-fuel charge in through the intake port. At the top, the spark plug ignites the mixture. 2. Downstroke (Power & Exhaust): The explosion drives the piston down (the power stroke). As it moves down, it uncovers the exhaust port to let burnt gases out. It then uncovers the transfer port, forcing the fresh air-fuel mixture from the crankcase up into the cylinder 4-stroke engine: 1. Intake StrokeThe piston moves downward, creating a vacuum. The intake valve opens, drawing a mixture of air and fuel into the cylinder. 2. Compression StrokeBoth the intake and exhaust valves close. The piston travels back up, compressing the trapped air-fuel mixture, which increases its temperature and pressure. 3. Power StrokeJust before the piston reaches the top, the spark plug fires, igniting the compressed fuel. The resulting combustion forces the piston rapidly downward, generating the mechanical energy that drives the crankshaft. 4. Exhaust StrokeThe exhaust valve opens as the piston moves back up. This upward movement pushes the spent, burned gases out of the cylinder and through the exhaust system, clearing the chamber to repeat the cycle. 6-stroke engine: 1. Intake: The piston descends as the intake valve opens, drawing a fresh air-fuel mixture into the cylinder. 2. Compression: The piston travels upward to compress the mixture, and a spark ignites it. 3. First Power: Combustion forces the piston downward. 4. Scavenging/Intake: As the piston continues moving past Bottom Dead Center, a fresh air-fuel mixture enters, pushing out the remaining exhaust gases (similar to a two-stroke engine's process). 5. Second Compression: The piston moves back up to compress this new mixture. 6. Second Power: A second spark ignites the mixture for another power stroke, followed by the final exhaust release.