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Heat flow depends much on the location, large heat flow for these regions have high temperature combustion gas moving at high speed. In areas of high heat flow, thermal stresses must be kept below can cause damage because of tired up (so the right temperature is lower than about 400 0 c for cast iron and 300 0 c for aluminium alloys). Mirror surfaces of the cylinder must be kept lower than 180 0 c to stop sabotaging the lining lubricants. Spark plug and xupáp must be cooled to avoid premature ignition and engine knock. Therefore, to solve the problem of heat exchange is clearly an important task in the design.

This heat flow depends on the location, the largest heat flow in areas with high temperature combustion gas moving at high speed. In areas of high heat flow, thermal stresses must be kept below can cause up to ruin because of fatigue (thus lower the temperature to 400 0C and 300 0C for cast iron to aluminum alloys). Cylinder mirror surface must be kept below 180 0C to prevent lubricant damaged membranes. Spark plugs and valve must be cooled in order to avoid the ignition and engine knock. Therefore, to solve the problem of heat exchanger is clearly an important task in the design.

This temperature dependent multi line position, the line temperature has the highest air temperature and high speed motion in the combustion zone. In these regions where the temperature is high, the thermal stress is at a lower level and may be destroyed (because of fatigue so the temperature must be lower than about 400 0C pairs and the 300 pairs of 0C cast aluminum alloys). The surface of the glass cylinder must be kept below 180 0C to prevent the destruction of the lubricating oil film. Bugi xUP P, ignition and cooling must ignition phenomenon and avoid engine sound. So solving the problem of heat exchange is obviously an important task design.