I would like to use simuink blocks to simulate my gas engine
Well, the dynamics of a internal combustion engine is quite typical. One need the complete dynamical model of internal combustion engine for its actual simulation in matlab. IC engine has many sub-systems and every sub-systems has its own dynamics. Moreover, every subsystem affects the dynamics of other subsystems. Though one can write code or make simulink program for whole IC engine at once but believe me it will be very complex, troublesome and time consuming. On the other hand, i would appreciate that first you concentrate on a smaller subsystem like coolant circulation or fuel injection in IC engine. I have simulated coolant circulation in Matlab. For this purpose, you need coolant circulation model (given link below), engine heat, running speed and many variables (There are a lot of variables in this small subsystem, you can think about complexity of whole IC engine). Make blocks, one for combustion chamber and one for regulator. According to systems equation, connect the output of one chamber to another.
http://www.ces.clemson.edu/~msalah/Jour2.pdf
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