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Valves
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How Valves
Work
The
Camshaft & Valve Train.
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Most
modern engines have what are called overhead cams. This means that
the camshaft is located above the valves, as you see in Figure
above. The cams on the shaft activate the valves directly or through
a very short linkage. Older engines used a camshaft located in the
sump near the crankshaft. Rods linked the cam below to valve lifters
above the valves.
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This approach has more moving parts and also
causes more lag between the cam's activation of the valve and the
valve's subsequent motion. A timing belt or timing chain links the
crankshaft to the camshaft so that the valves are in sync with the
pistons.
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The camshaft is geared to turn at one-half the rate of the
crankshaft. Many high-performance engines have four valves per
cylinder (Two for intake, two for exhaust),
and this arrangement requires two camshafts per bank of cylinders,
hence the phrase "dual overhead cams".
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We give our thanks to
HOW STUFF WORKS for allowing us to use their info and
graphics!
For more information on how engines
or anything else in this world works, visit
www.howstuffworks.com. |
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Here at
Total Car Care Centers we have all
the services your
vehicle needs to keep running smoothly.
Oil changes, transmission flushes, cooling system flushes, air
filters, & fuel filters are just a few of the many services & products we
offer!. |
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We
install quality rebuilt and/or used engines. We also perform minor
repairs that don't require engine removal.
CALL
FOR APPOINTMENT
503-266-2700 |
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