Data: volume 0,35liters, compression ratio 1:9. 600J added in combustion between point 3 and 4 in the process.

Temperature and pressure in 1,2,3,4 in the otto cycle
Find energy added from 4-1

If a gas expands from point 4 to a new position 5, where the pressure is equal to the starting pressure. Then what is the temperature and volume in this point?