Response to the following problem:
A 380 cc single-cylinder two-stroke motorcycle engine is operating at 5500 rpm. The engine has a bore of 82 mm and a stroke of 72 mm. Performance testing gives a bmep = 6.81 bar, bsfc = 0.49 kg/kWh, and delivery ratio of 0.748.
(a) What is the fuel to air ratio?
(b) What is the air mass flow rate (kg/s)?