Interactions Among Oil Additive and Engine Operating Parameters Affecting Engine Deposits and Wear

Pless, Loren G.

doi:10.4271/720686

Cited by 8 publications

References 4 publications

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The effects of engine oil additives on valve train wear

Shirahama

Hirata

1989

Lubrication Science

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Preventing valve train wear in automotive engines i s one of the most importantproperties of anengine oil. However, the influence of engine oil additives on valve train wear has not been suffliently clarifld. In this investigation, the antiwearperformance of additives (such as ashless dispersants, metallic detergents and zinc dithiophosphate -WTP) and the influence of the interaction of the additives were evaluated. Firstly, ashless dispersants (such as succinimides. succinic esters and benzylamine-type additives) did not appear to provide signfxant antiwear protection in valve train wear tests. However, a succinimidecontaining boron demonstrated excellent antiwear performance.Secondly, metallic detergents were considered. An overbased calcium sulphonate and an overbased phenate were found to have good anti-scufmg performance when evaluated in engine tests and in Falex wear tests. However,from the results of four-ball tests, these additives did not appear to have many extreme pressure properties. From surface analyses, it was determined that a calcium carbonatefrlm was formed on the sliding surface of the Falex test piece, and thisfrlmprovidedgood protection against wear.Finally, the interaction of m T P , succinimides and calcium detergents and their influence on valve train wear were studied. The decornosition temperature of ZDTP increased with certain additives, including the succinimide. As a result, scufmg was more prone, at temperatures below those increased temperatures. Also, changes in additive concentration on the sliding surface. due to competitive adsorption, altered the antiwear performance of the oa

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The effects of engine oil additives on valve train wear

Shirahama

Hirata

1989

Lubrication Science

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Additive Interactions and Their Effect on the Performance of a Zinc Dialkyl Dithiophosphate

Rounds

1978

A S L E Transactions

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General Motors CorporationWarren, Michigan 48090Four-ball zuenr sttidies have demowstmted tlznt ttie m~tituear perfornlance of n cornmercinl zinc dinlkyl dithiophosphnte (ZDP) nntiruenr rigen1 can be ridvcrsely affected by tire presc~ice of some friction niodfiers, E P rigents, osidr~tion intiibito~s, nnd detergentdisperstn~ts. T o csplrin these obseruntions, ZDP decomf)osition stt~dies 7ue1.e co?zd~~cted tuitl~ these other nddi1ive.s present. None of tile rt~ensrrred ZDP decomposition characteristics comi)letely explnin &he obse~vcd clinnges in ZDP a,~tituenr peformnrlce. Complex,formntion in the 61ilk oil and competition for tlie stcrf(~ce serrn to be i~~uoIued.

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A Study of Lengthened Engine Oil-Change Intervals

Pless¹

1974

SAE Technical Paper Series

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Interactions Among Oil Additive and Engine Operating Parameters Affecting Engine Deposits and Wear

Cited by 8 publications

References 4 publications

The effects of engine oil additives on valve train wear

The effects of engine oil additives on valve train wear

Additive Interactions and Their Effect on the Performance of a Zinc Dialkyl Dithiophosphate

A Study of Lengthened Engine Oil-Change Intervals

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