Algodoo

I have two questions:
1. In a standard internal combustion engine, the spark plug fires at just the right time near TDC of the compression stroke. So, how does the spring engine get its timing?
2. Why use a spring for the connecting rod? Wouldn't it be better to use a solid bar?

Thanks!

thanks for the questions! and im sorry for the very late reply!
the spring isnt timed really, its damping is negative, so it adds more power than is put in. basically, it springs back onto the piston more than the piston pushed it. the crankshaft turning compresses the spring, and it releases the energy as soon as its allowed to expand!

axles tend to be weaker as higher speeds, than springs. so springs are better for that. solid bars work for lower speeds just fine!

Thanks for the explanation!