I think the idea has several parts.
The piston and block will expand and then contract at different rates causing the surfaces to seperate.
The inclusion of ATF and a wick stops the petrol from being explosive, rather a slower burn.
The ATF will boil and encourage it to seep down the cylinder walls.
Shocking with a freeze spray is one idea, but not commonly done as it can encourage cracking / warping of parts. Still, if I have no success it's another thing to try.
If nothing else it will be good fun.
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