This is realistic car engine shown in cutaway.
-Separated oil pan, engine block, engine head and valve cover(s)
-Double OverHead Camshafts (DOHC) - more complicated but makes you able to adjust intake and exhaust valves separatley
-Belt driven camshafts - easier and cheaper to service than chain driven ones, but belt needs to be replaced on a regular basis.
-Pentroof design - Triangular shaped combustion chamber
-Intake on right, exhaust on left
-1:1 bore-stroke ratio
-Compression about 7.0
TO DO:
-VTEC! (variable valve timing and lift)
-water/oil passages
-Intake/exhaust mainfold - DONE
-Belt tensioner (not sure if I'll make it - PHUN with "streching hinges" makes it difficult
-maybe some details to make it look more realistic?
EDIT: New version - Now with working spark plug and intake and exhaust.
Controls: NONE

Simply watch how does it work

You can try adjusting engine speed (hinge on crankshaft), but PLEASE do not exceed 100 RPM or timing belt can get messed up