In addition to the thermodynamic results, SIMOTTO provides utilities to evaluate the kinematics and dynamics of the valve train,  crankshaft assembly or of the individual non linear valve spring.

The indicated gas pressure evolution in the valve areas and inside the cylinder are used as input for these calculations. Additional geometric input data, as well as input data concerning the mass and rotational inertia of the involved items must be provided by the user. 

Typically calculation results concerning the dynamics of the crankshaft assembly are shown in the figures aside and below.

In diagram aside, the « normal » contact force is downwards, i.e. has a negative value.

At 8000 rpm, however, this value becomes positive between -30 and +30 °CA.  This tells the user, that the cam will not stay in permanent contact with the rocker.

The « assumed » spring force (yellow line), is that, which the spring would apply against the tappet, if its own mass could considered to be zero.

Note: Higher the engine speed, bigger the difference between assumed and effectively applied spring force.