Mechanically Timed Engine
This is as close to the real thing as it gets. A four stroke engine (intake, compression, power, exhaust) or (suck, squeeze, bang,
I managed to get a 2:1 crank to cam ratio by using rubber band ends
on the crank cause you can't do it with sticks. I had to use 2 cams
cause I can't mount 2 lobes on one cam. I got lifters running off the
lobes, push rods and rockers transferring the force to the valves.
Both cams are timed with the crank. I attached timing marks for
easier viewing. Since its mechanical, yes you can control the speed .
Credit to alfajim for motivating the idea and valve design
Warning: Over revving the engine may cause it to jump out of proper
timing, may also cause engine parts to go flying.
CAUTION: over revved engines may cause bodily harm and or death