Page 8 of catalogue Cylinder head gaskets of Reinz-Dichtungs-GmbH

Testing: Tougher than practical use
Testing

Apart from using modern engine test methods, we also carry out extensive tests in our chemical and physical laboratories. As a customer, you choose between numerous testing and simulation possibilities, and you determine the testing scope and budget with us. This ensures that you receive optimum value during the testing phase. In addition, through Dana Sealing Products and its five development centers in Neu-Ulm, North America, Japan, and Brazil, VICTOR REINZ has worldwide access to 27 engine test stands and associated laboratories for analysis and static/dynamic pre-testing. All activities are coordinated by the Competence Center R & D.

Laboratory tests (excerpt) ¬ RPM 550 3): By means of a pressuresensitive film (Fuji film), the distribution of surface pressure over the head gasket is determined, scanned, and evaluated electronically. ¬ RPM 528 3): By means of resonance pulsers and simulators, various conditions (temperature, pressure, sealing gap movement) are simulated, and conclusions drawn about the head gasket's endurance life. ¬ Engine simulation test stand VIPS 4): This test stand was specially developed by VICTOR REINZ for the highly realistic simulation of engine operation under actual ignition sequence and with simulated temperatures – only the engine block and cylinder head with Valves and head Bolts are required for this test. This obviates expensive runs on conventional engine test stands, and is also environmentally friendly, because the engine is not fired. Initial tests with the Pneumatic engine simulation test stand can be made at a very early stage – even before the complete engine is ready to run.

¬ Static/dynamic sealing gap measurement: Sensors fitted in the head gasket measure the relative movement between engine block and cylinder head. ¬ Measurement of bolt force and the torquing sequence and method: Torques and torque angles are measured with a special Wrench, and bolt forces are determined ultrasonically. The recorded measurement results of torque and torque angle versus bolt force permit comprehensive analyses of the sealed joint's properties. ¬ Porosity and roughness test: First, a static pressure test is performed at room temperature, followed by a sealing tightness test under thermal/dynamic loading. Engine block and cylinder head are replaced by steel Plates with a defined porosity (simulation of blowholes of defined size by means of bores) and roughness (through surface Milling).

Gas pressure [bar]

150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 0 230 320 410

Engine operation VIPS4)

500

590

860

950

1040 1130 1220 Crank angle [°CA]

Under pressure – realistic pressure curves also with simulated conditions.

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