Squish, is the area around the edge of the piston that deflect's the fuel mixture into the centre of the combustion area in the cylinder head, it's an area that need's to be measured when fitting heads to barrels. Air cooled 2T motors need to to be not really any less than 1.0mm, L/C motors 0.8mm (road use), race engines can run lower but need higher octane fuel. I'm no expert and there are plenty of tuning books to read up on it! I'm sure someone will help on this question.
haha I thought it was called squitch no wonder I couldn't find anything on it. ive found loads of vids on it now.
Squitch is the noise made when you step in dog shit. Squish (or more correctly the Squish Band) is the clearance between cylinder bore a cylinder head that allows for correct combustion and compression ratio. Too small a Squish Band can cause detonation with standard petrols available at the pump and detonation can cause metal to be 'picked' out of the piston crown, causing damage. A Squish that is too small could also cause overheating of the piston crown and possible melting of the centre of the piston crown. This is why a Squish band of 0.8 to 1mm is recommended for small 2T engines using normal 95 to 95 RON petrol. To run a really small Squish Band gets you into the area of Nitromethane fuels, just like RC Model engines.
