Engine lubricants have been found to both increase and reduce valve and seat wear,
depending on the additive composition and the amount of oil that reaches the valve/seat interface.
In inlet valves, liquid film lubrication is most dominant as temperatures are not usually high enough to volatilize the lubricant hydrocarbons and additives. Exhaust valves, however, are predominantly lubricated by solid films formed at the higher operating temperatures by oil additive ash compounds such as alkaline-earth and other metal oxides, sulphates, and phosphates (e.g. calcium, barium, magnesium, sodium, zinc, and molybdenum). Very thin metal oxide films have been found to be beneficial in reducing
valve wear [21]. Too much solid film lubricant, however, can be detrimental and lead to valve guttering or torching due to flaking (as described in Sections 3.3 and 3.4).
E N G I N E E R I N G R E S E A R C H S E R I E S
Automotive Engine Valve Recession
R Lewis and R S Dwyer-Joyce
Series Editor
Duncan Dowson
Professional Engineering Publishing Limited,
London and Bury St Edmunds, UK
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2 comments:
In accordingly automotive engine effect is most important. Because if engine is nice condition then automotive life will be long otherwise auto parts give many problems.
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Proper lubrication is probably the most critical maintenance that can be done to an automobile. Fresh clean oil will preserve the entire drive train of the engine in more than 1 way.
The clean oil will stop the engine from developing sludge which will starve different areas of the engine for lubrication. You can damage bearings, cams, crankshaft and much more.
With proper lubrication maintenance and service, today's automobiles can drive 150-200K without any internal engine issues.
William
www.asapmotors.com
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