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Table 5

Parameters of tests carried out on the “Cube”.

    ≪ Cube »
Valve dynamics characteristic for full engine load at 1200 rpm and 1450 N.m Signal frequency (Hz) 5
Total signal time (ms) 200
Pressure application time (ms) 13
Valve lift time (ms) 25 + 100 (imposed by the cube)
Valve lift amplitude (mm) 9.5
Valve rest time on seat (ms) 60
Contact load at full engine load for 1200 rpm and 1450 N.m Force equivalent to 18 MPa for a valve (kN) 18750
Air column stiffness (kN/mm) 4
Impact speed (mm/s) 650
Associated kinetic energy (J) 1.48
Return spring force upon impact (N) 2295–7500
Stiffness of the return spring (N/mm) 4000
  Contact temperature (°C) 250–350
Flow at the origin of the environment at full load for 1200 rpm and 1450 N.m Gas flow at the intake (m3/h by valve) 21.3
Recirculating exhaust gas flow (m3/h by valve) 21.3
Burned diesel recirculating on intake (l/h by valve) 1
Burnt oil recirculating on intake (g/h by valve) 1.7
Stiffness of the mechanism Note: the stiffness of all components must be considered in the test bench (valve, seat, spring, cylinder head gasket, cylinder head, engine block, cylinder head screw) Yes

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