1. But one essential part-- the cam shaft -- has changed little over time. 2. The cam shafts are slightly radicalized, and the exhaust system is upgraded. 3. Liquid cooled double overhead cam shaft with four valve desmodromic cylinder head. 4. Makes a good strong tool, heavy gear, or cam shaft . 5. The cam shaft works something like a large, eccentrically shaped key that turns many locks simultaneously. 6. Note that an electromechanically-actuated inlet valve does not require complicated valve gear ( cam shafts , etc ). 7. The cam shaft is rotated and, according to the cam profile, the follower moves up and down. 8. The final incarnation of the 128 SOHC engine was modified to utilise 16 valves and dual cam shafts . 9. I can't watch the Brickyard 400 without getting an irresistible urge to run out and grease a cam shaft . 10. A timing assembly rotates the cam shaft , which in turn opens and closes the engine's valves in elaborate, mechanical synchrony.
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