how to model a small engine

i am modeling a small engine but got confused in choosing the materials.
below i m giving the specification of my engine.please tell me if i am doing something wrong.
1. engine -v type, diesel
2. cylinders-8
3.bore-18-22mm
4.stroke-30-40mm
materials used
1. cylinder head- EN-9
2. cylinder -EN-9
3. piston-?don't know size of the grooves.
4.rings-?.don't know the how to design them.
5. connecting rod EN-8
6.Camshaft&crankshaft - EN-9
8.Crankcase-M/s or EN-8
9.Valve-?
please also tell me how can increase compression ration with in my scale& my material are right or not.
please also tell me if something is missing.

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