Question: A single - cylinder, four - stroke engine having a cubic capacity of 0 . 7 litre was tested at 2 0 0 rpm .

A single-cylinder, four-stroke engine having a cubic capacity of 0.7 litre was tested at 200 rpm. From the indicator diagram the mean effective pressure was found to be 106 N/m? and the mechanical efficiency is 75%.
Find the frictional power of the engine if the engine is an under-square engine with a under-square ratio of 0.8. Calculate the bore and stroke.

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