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Engineering
Mechanical Engineering
Turbocharging carbureted petrol 2 stroke engines
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[QUOTE="Baluncore, post: 6390522, member: 447632"] When a 4 stroke engine is converted to 2 stroke, the cylinders are used at twice the rate, so it has an improved power to weight ratio, but with higher emissions. A 4 stroke engine has separate inlet and exhaust manifolds so it can be easily turbocharged. For inducted air-fuel mix engines the maximum compression ratio is limited by the octane rating of the fuel. The effective compression ratio is the product of the cylinder compression ratio, and the air pressure boost ratio. Most engines without superchargers are designed for optimum compression ratio, so there is little room for improvement. You might need to change from gasoline to ethanol for a higher compression ratio. Fuel injection overcomes the compression limit. There have been many fuel injected two stroke diesels with superchargers. [/QUOTE]
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Turbocharging carbureted petrol 2 stroke engines
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