Compression, leak-down, endoscope, oil analysis: four independent tests, every result signed, dated and archived against the engine's serial number. Non-conforming units are stripped for parts or recycled.
Compression measures the pressure each cylinder generates on its power stroke. We take readings cold and hot, every cylinder, and compare. Variance above 8% between cylinders points to wear — worn rings, leaking valves, a tired bore — that we refuse to pass on.
Leak-down pinpoints what compression only detects. We pressurise each cylinder with dry air at 7.5 bar and measure how much escapes — and where. The sound identifies the source: intake (intake valve), exhaust (exhaust valve), oil filler (rings), radiator (head gasket).
A 4 mm rigid endoscope inspects every combustion chamber and every intake and exhaust port. HD video records cylinder walls, piston crowns, valve faces and seats, with two passes per chamber. Anything unclear triggers a strip-down before the engine clears testing.
Oil analysis confirms the first three tests at particle scale. A partner lab runs each sample through ICP spectrometry for metallic particles, fuel dilution and water. If any threshold is exceeded, the engine returns to inspection before it can be released for sale.
Engines that fail the protocol are stripped for parts or recycled. None is resold "as new" without proof of testing.
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