Squish (piston engine)

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Squish band

Squish is an effect in internal combustion engines which creates sudden turbulence of the fuel/air mixture as the piston approaches top dead centre (TDC).[1][2]

In an engine designed to use the squish effect, at top dead centre (TDC) the piston crown comes very close, (typically less than 1mm[2]), to the cylinder head. The gases are suddenly "squished" out within the combustion chamber, creating turbulence which promotes thorough fuel/air mixing, a factor beneficial to efficient combustion. Squish effect may be found in ohv and ohc engines, including engines with a Heron cylinder head.


  1. ^ "How to Measure Your Cylinder Head Squish Clearance..." Retrieved 16 June 2013.
  2. ^ a b "The Combustion Chamber" Retrieved 16 June 2013.