Squish (piston engine)

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"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, which is beneficial for efficient combustion.

References

↑ "How to Measure Your Cylinder Head Squish Clearance..." Retrieved 16 June 2013.
↑ 2.0 2.1 "The Combustion Chamber" Retrieved 16 June 2013.

Bibliography

Progress Report for Combustion and Emission Control for Advanced CIDI Engines. United States Office of Transportation Technologies, United States Department of Energy

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