Connecting rod ratio

Connecting rod ratio

The connecting rod ratio describes a design feature in reciprocating piston engines that affects the piston movement. ${\displaystyle \lambda }$

It is defined as the ratio between the crank radius and the length of the connecting rod . The quotient for common car engines is between 0.28 and 0.33. With diesel engines , the quotient is usually lower than with comparable gasoline engines . The higher the connecting rod ratio, the greater the piston side forces . A lower ratio leads to an increasing overall height of the engine with the same piston stroke. ${\displaystyle r}$ ${\displaystyle l_{\text{pl}}}$ ${\displaystyle \lambda :={\frac {r}{l_{\text{pl}}}}}$

literature

• Richard van Basshuysen, Fred Schäfer: Handbook Internal Combustion Engine Basics, Components, Systems, Perspectives . 5th edition, Vieweg + Teubner Verlag, 2010, ISBN 3834806994 .