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I think this is the idea he (she?) was going for, basically an anti-lag system. Here's an interesting setup supposedly similar to what Prodrive ran on their WRC STi's: https://motoiq.com/external-combusti...impreza-sti-2/
This is the stupidest thing I have seen in a very long while.
There is no point in adding springs in a combustion chamber; the "boom" drives the piston down, and a spring would destroy the said chamber, and itself in no time.
That spring goes to the bottom side of the piston, people.
You need it to push the piston back up.