The test setup, called Proteus, consists of a one cylinder optically accessible heavy duty engine, based on a DAF MX engine, driven by an electrical motor. The piston is elongated and the upper part of the liner and piston bottom are both made of sapphire. Via a mirror, positioned under 45 degrees, optical access to the combustion chamber is obtained. The hydraulic cylinder can be lowered, allowing easy access to the combustion chamber. The compression ratio can be changed quickly between measurements by positioning the cylinder head on a different height, thereby changing the volume at TDC.
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