The ABCs of Carburetion

UM-900 (1959)

 

Page 8 of 19

THE CARBURETOR'S JOB Continued
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SPARK TIMING
There is one more job the carburetor does, though somewhat indirectly. In most modern cars, the carburetor bore just above the throttle valve is the location of a vacuum port leading to the automatic spark advance on the distributor. This automatic advance is cali-
brated to regulate the spark timing correctly for satisfactory operation under various loads. Manifold vacuum is the factor most sensitive to loads; the vacuum port in the carburetor is the means by which timing is made to vary with manifold vacuum and thus engine loads.
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