Algodoo

big constant (100) = VERY unstable
too big damping
too big cylinders
u need make only 1 flywheel
the way of transmitting moment from first to secong flywheel is terrible. really.
the moment of engine SO low!

sry for my english, i hope that u undrstand

I think i understand what you mean, i made a car using this engine and it worked fine for me.
damping is high because i didnt want to modify the weight of the engine to get power.
theres two flywheels each spinning in opposite directions, this counters the inertia that spring engines have. there linked in a way that prevents both flywheels from spinning the same direction, and this also combines both the flywheels power so you use all 8 cyl.