Beato
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Registered: 14th Sep 06
Location: Leven, Fife
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I have been reading up on how engines work etc and am I bit confused about something. It says that the cam lobes push down on the valves to open and close them, but in other bits it says the lobes push against the rocker arms to open them and the springs close them. So does this mean there are cars with rocker arm and car without? Thanks for any help 
[Edited on 09-07-2007 by Beato]
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Vaux Lad
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Registered: 15th Dec 04
Location: Stoke-on-Trent
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16v engines dont have rocker arms, the cam lobes act directly onto the top of hydraulic bucket tappets(which then push the valve open)
8v engines have rocker arms, which the cam lobe pushes down, which then pushes down on a thrust pad and pushes the valve open.
The strength of the valve spring pulls the valve shut as the lobe moves away from it.
[Edited on 09-07-2007 by Vaux Lad]
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Beato
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Registered: 14th Sep 06
Location: Leven, Fife
User status: Offline
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8v engines use just one cam therefore that one cam is used to open the inlet valve on one side then the outlet on the other side via the rocker arm. 16v engine has DOHCs so a cam for the inlet and a cam for the outlet. Am I right in saying that? Thanks mate
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Vaux Lad
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Registered: 15th Dec 04
Location: Stoke-on-Trent
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Pretty much.
16v cams sit right over the valves, whereas a 8v cam sits inbetwee(so it needs rockers to operate the valves)
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