Present Status of Japanese Motor Oils and Extension of Oil Drain Intervals

Sugiura, Kensuke

doi:10.4271/780953

Cited by 7 publications

(3 citation statements)

References 4 publications

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“…( 1) flash temperature with solid-to-solid contact (2) heating by viscous shearing in elastic hydrodynamic lubrication. According to the flash temperature concept, the surface temperature can be revealed by the following equation:…”

Section: Effects Of Additive Interaction On Valve Train Wearmentioning

confidence: 99%

“…The numbers in the figure indicate the argon ion sputtering time where (1) means the surface before sputtering and(2). (3) and(4) mean the surface after sputtering at 1.…”

mentioning

confidence: 99%

“…shows the spectra of a new test piece and the same piece following tests of a succinimide (Oil A).Figure 2shows the spectra from test pieces when Oil B and Oil D were tested. The numbers in the figure indicate the argon ion sputtering time where (1) means the surface before sputtering and(2). (3) and(4) mean the surface after sputtering at 1.…”

mentioning

confidence: 99%

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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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Section: Effects Of Additive Interaction On Valve Train Wearmentioning

confidence: 99%

“…The numbers in the figure indicate the argon ion sputtering time where (1) means the surface before sputtering and(2). (3) and(4) mean the surface after sputtering at 1.…”

mentioning

confidence: 99%