Work input/output in adiabatic process

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I have to find the max cycle pressure, max temp, work input and output for an engine.

I have been given the initial air pressure, temp and the volume of the cylinder.

Fuel is added at 2.5MJ/kg

For the air i have Cv, the index (1.4) and an R value of 287 J/kg K (not sure about this value)

I calculated the max pressure using PV^1.4 = const.
For max temp i used PV/T = const.

1) Not sure if I have used the correct method for calculating the pressure and temp

2)Not sure how to calculate the Work input/output. Is the W=PV equation correct?


Would this equation work W=(P2*V2 - P1*V1)/n(1.4)-1
 
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