4. (3 pts) Sketch cylinder/cylinder head configurations to show the differences between PFI and GDI gasoline injection systems. In each sketch, label the fuel injector, spark plug, intake valve, exhaust valve, and piston.

Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.