14 A six-cylinder SI engine with a compression ra tio of 10.5:1 oper ates on a four-stroke cycle at 3000 RPM. Air enters the cylinders at T 110 F and P = 12.8 psia. The intake valve closes at 20° BDC and combustion starts when the spark plug fires at 15 bTDC. Con- necting rod length is 6.64 in. and crank offset is 1.66 in. Calculate: (a) Cylinder temperature at start of combustion using air-standard Otto cyde analysis ['F] (b) Cylinder temper ature when spark plug fires assuming compression doesn't start until intake valve closes. ['F]

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IC engines

The term "engine" indicates a mechanical device/machine used to convert input energy to a specific mechanical output. The input energy may be in the form of chemical energy, thermal energy, or so on and mechanical output is in the form of mechanical energy (work done). Generally, the engines classify into two groups which are internal combustion type and external combustion type, and further, these two types can be classified into two types that are reciprocating and rotary engines.