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- Valve_shim abstract "A valve shim is a disc of hardened metal of precisely calibrated height used to adjust the clearance (US:lash) between the back side of the cam-lobe and the valve on which it operates where the cam-lobe operates directly on the valve without an intermediate rocker arm. The shim sits atop a shim bucket which itself sits atop the valve-stem and moves up and down within a machined bore. While hydraulically self-adjusting valves are sometimes used for their lack of required adjustment they do not work well in engines capable of high RPMs. In situations like these shims are most often used. As an example most motorcycle engines capable of 8000RPM+ use shim adjustable valves.A top-hat shim (lash cap US) is a small inverted hardened-metal cup placed atop a valve stem in an internal combustion engine. Varying thicknesses of top-hat shims are used to adjust valve clearances in a similar fashion to standard flat disc shims (as used in Fiat SOHC/DOHC, Volvo and early Jaguar engines) where the cam-lobe operates directly on the valve without an intermediate rocker arm. Top-hat shims offer a dramatic weight reduction over standard disc shims and are used in applications where valve-train weight reduction is important (i.e. high-performance road and race orientated engines).In competition engines, where aggressive cam action is common, lash caps are used to protect the tip of the valve stem. For this reason they are a necessity when titanium valves are used.As well, lash caps are often used to attain a required valve stem protrusion.".
- Valve_shim wikiPageID "5243485".
- Valve_shim wikiPageLength "1882".
- Valve_shim wikiPageOutDegree "15".
- Valve_shim wikiPageRevisionID "707929302".
- Valve_shim wikiPageWikiLink Cam.
- Valve_shim wikiPageWikiLink Category:Engine_valves.
- Valve_shim wikiPageWikiLink Fiat_Automobiles.
- Valve_shim wikiPageWikiLink Hydraulic_tappet.
- Valve_shim wikiPageWikiLink Internal_combustion_engine.
- Valve_shim wikiPageWikiLink Jaguar_Cars.
- Valve_shim wikiPageWikiLink Overhead_camshaft.
- Valve_shim wikiPageWikiLink Poppet_valve.
- Valve_shim wikiPageWikiLink Rocker_arm.
- Valve_shim wikiPageWikiLink Shim_(spacer).
- Valve_shim wikiPageWikiLink Volvo_Cars.
- Valve_shim wikiPageWikiLinkText "Valve shim".
- Valve_shim wikiPageUsesTemplate Template:Automotive-part-stub.
- Valve_shim wikiPageUsesTemplate Template:Multiple_issues.
- Valve_shim wikiPageUsesTemplate Template:Orphan.
- Valve_shim wikiPageUsesTemplate Template:Unreferenced.
- Valve_shim wikiPageUsesTemplate Template:What%3F.
- Valve_shim subject Category:Engine_valves.
- Valve_shim hypernym Disc.
- Valve_shim type Album.
- Valve_shim type Redirect.
- Valve_shim comment "A valve shim is a disc of hardened metal of precisely calibrated height, used to adjust the clearance (US: lash) between the back side of the cam-lobe and the valve on which it operates, where the cam-lobe operates directly on the valve without an intermediate rocker arm. The shim sits atop a shim bucket which itself sits atop the valve-stem, and moves up and down within a machined bore.".
- Valve_shim label "Valve shim".
- Valve_shim sameAs Q7912832.
- Valve_shim sameAs m.0d9nf4.
- Valve_shim sameAs Q7912832.
- Valve_shim wasDerivedFrom Valve_shim?oldid=707929302.
- Valve_shim isPrimaryTopicOf Valve_shim.