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What is the minimum number of compression rings required in an engine?

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in Automotive Engine Design by (137k points)
What is the minimum number of compression rings required in an engine?

(a) 5

(b) 1

(c) 2

(d) 3

I had been asked this question in unit test.

My question is taken from Engine Components topic in chapter Basic Engine Components of Automotive Engine Design

1 Answer

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Best answer
Right choice is (c) 2

The best explanation: A minimum of two compression rings are required because of the high-pressure difference between the combustion chamber and the crankcase at the beginning of the power stroke. This difference may be as high as 70 atmospheres.

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