Automotive Dictionary: Base Circle

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Automotive Dictionary: Base Circle
Throughout this site we use many technical terms, and given the breadth of readership our site enjoys, sometimes we are remiss and incorrectly assume everyone knows what we are referring to. For those that do not, here are some explanations of the technical terms use.
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Base Circle


Base Circle
The lower part of the valve-driving cam, which is a segment of a true circle. The base circle is the 'idling' part of the cam operation and gives place to the ramp and flanks as the cam rotates.
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