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In two-stroke engines, what is required to purge exhaust gasses?

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in Automotive Engine Design by (137k points)
In two-stroke engines, what is required to purge exhaust gasses?

(a) Lighter piston

(b) Lubrication

(c) Oil

(d) Scavenging

This question was posed to me by my college professor while I was bunking the class.

The above asked question is from Petrol Engine Fuel Supply System in chapter Exhaust System & Petrol Engine Fuel Supply System of Automotive Engine Design

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The correct answer is (d) Scavenging

Easy explanation: In two-stroke engines, scavenging is required to purge exhaust gasses, as well as charge the cylinders for the next power stroke. In small engines, this requirement is commonly met by using the crankcase as a blower.

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