What is the best starting point?
first you should made its bottom casing , then the crank and after piston assemblies . . or you can do is fist make crankshaft and the whole model will be respect to that part .
Answered with a tutorial: https://grabcad.com/tutorials/how-to-model-an-engine-v6-in-solidworks
my friend Samu I couldn' t open your image..
That's a V6 crankshaft. That what you modeled is something else. There should be only 3 necks for connecting rods and 4 main bearings.
tutorial video V8 https://www.youtube.com/watch?v=CViLe1NG63k&index=59&list=UUEcQmIBzGyMD_IdH14QTWbQ
Maybe can help you
thanks teacher i want to a car model