the orbiting scroll member 56 u2032 extending between scroll wrap 58 u2032 is formed as a generally planar surface similarly the surface of end plate 74 u2032 of the non orbiting scroll member 70 u2032 extending between scroll wrap 72 u2032 is also formed as a generally planar surface in this manner when orbiting scroll member 56 u2032 and non orbiting scroll member 70 u2032 are assembled the flank surfaces of scroll wraps 58 u2032 and 72 u2032 engage each other the tips of scroll wrap 58 u2032 engage end plate 74 u2032 and the tips of scroll wrap 72 u2032 engage end plate 60 u2032 to provide for the sealing of the compression pockets fig3 illustrates the thermal expansion effects due to normal operating temperature on prior art orbiting scroll member 56 u2032 and non orbiting scroll member 70 u2032 without the compensating effect of the temperature compensation system of the present disclosure the higher temperature of the radially inner portion of wraps 58 u2032 and 72 u2032 cause the radially inner portion of wraps 58 u2032 and 72 u2032 to grow to a larger extent than the radially outer portion of the wraps causing the tip of wraps 58 u2032 and 72 u2032 to each form somewhat of a convex shape while the mating surface of end plates 60 u2032 and 74 u2032 maintain a general planar configuration.