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Our Mechanics are all ASE certified!

 

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Page last updated
04/09/2008

 

Valves

 

 How Valves Work

  • Valve Train
    The valve train consists of the valves and a mechanism that opens and closes them. The opening and closing system is called a camshaft. The camshaft has lobes on it that move the valves up and down, as shown in the figure below.

The Camshaft & Valve Train.

 

The Camshaft & Valve Train.

  • 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.
     

  • 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.
     

  • 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".

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.

 

 

We Now Offer

FINANCING


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!.

 

 

  We can repair most makes and models, foreign & domestic!

We can repair most makes and models, foreign & domestic!

 

 

 

 

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We are experts at minor engine repair!


We install quality rebuilt and/or used engines. We also perform minor repairs that don't require engine removal.

 

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We offer a wide variety of Brand Name tires...

We offer a wide variety of Brand Name tires in all styles and sizes!

...in all styles and sizes!

(Portland Center Only)

 

 

 

We use only quality brand name spark plugs!

We use only quality brand Name spark plugs in our service department!

 

 

We accept American Express, VISA, Master Card, Diner's Club, & Discover!We clear all checks through TeleCheck for your 'peace of mind', and ours!


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