ceramic coatings had little or no effect on overall engine performance.

Cylinder water temperatures were measured to determine if the ceramic coatings would act as a heat barrier. Cylinder inlet and outlet water temperatures for each cylinder were measured and averaged for the. three cycling notches 8, 4, idle. The average water temperature differentials are given in Table X. The cylinders with coated components all had a slightly higher water temperature than did the uncoated cylinders. The coatings apparently act as heat barriers restricting the heat flow through the piston crown and fireface, causing more heat to exit through the uncoated cylinder walls into the water.

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