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Why pistons and valves get up-close and personal

Interference engines allow the piston to go further into the combustion chamber to increase compression, and the valves to go deeper so they open wider and for longer. 

Photo credit: Shutterstock

By  Gavin Bennet

Columnist

What is the difference between “Interference” and “Non-Interference” engines and what are the pros and cons of the choice? Marcus

Both pistons and valves move in and out of a space at the top of engine cylinders known as the “combustion chamber”.

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