Comparing maximum pressures in internal combustion engines

Stanwood W. Sparrow, Stephen M. Lee
naca-tn-101
June, 1922

Thin metal diaphragms form a satisfactory means for comparing maximum pressures in internal combustion engines. The diaphragm is clamped between two metal washers in a spark plug shell and its thickness is chosen such that, when subjected to explosion pressure, the exposed portion will be sheared from the rim in a short time.

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Stanwood W. Sparrow, Stephen M. Lee; Comparing maximum pressures in internal combustion engines; naca-tn-101; June, 1922