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In which of the following stroke concerning ultra-lean mode the fuel is injected?(a) Intake(b) Compression(c) Expansion(d) ExhaustI had been asked this question by my college professor while I was bunking the class.My question is taken from Petrol Injection topic in portion Petrol Engine Fuel Supply System of Automotive Engine Design

Answer» CORRECT answer is (b) Compression

To elaborate: In the ultra-lean mode the fuel is injected later on as the piston is moving up on its compression stroke. This forces the fuel-air charge right up to the spark plug POINTS for the best BURNING condition. The COMBUSTION takes place PARTLY in the cylinder and party in the shaped piston crown.


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