Abstract
The instrumentation of the big end bearing of a 2.8 Litre v-6 gasoline engine to measure bearing oil film thickness during engine operation is described. The electrically insulated bearing and the journal form a capacitor with the oil film as the dielectric. Synchronous measurement of the capacitance enables the determination of the minimum oil film thickness, hm, as a function of crank angle. The minimum value of hm for a complete 720 degrees crankshaft rotation can be measured to a precision of about 5 per cent; it is little affected by chemistry of the engine oil performance package or by engine torque but decreases significantly with increasing oil temperature and increasing crankshaft speed (a).
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