Low Temperature Pumpability of Engine oils

Stambaugh, R. L.

doi:10.4271/841388

Cited by 14 publications

(3 citation statements)

References 9 publications

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“…round of research to determine why the MRV test method was inadequate. (24)(25)(26)(27)(28)(29)(30)(31) The sensitivity of some oils to cool-down rate was found to be the reason for the failure of the MRV test to identify oils with poor low-temperature performance. (24)(25)(26)3) In 1987, MacAlpine and May reported that basestock pour points or residual wax contents% alone do not predict low-shear viscometric properties of formulated engine oils under slow-cool conditions.…”

Section: B Background -mentioning

confidence: 99%

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Low-Temperature Pumpability of U.S. Army Diesel Engine Oils

Frame¹,

Montemayor²,

Owens³

1989

SAE Technical Paper Series

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Contract No. DAAK70-87-C-0043 AUG 2 31988 ! ' Approved for public release; distrioution unlimited H D~cernber 1987 07% % = Disclaimers The findings in this report are not to be construed as an official Department of the Army position unless so designated by other authorized documents. Trade names cited in this report do not constitute an official endorsement or approval of the use of such commercial hardware or software.

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Section: B Background -mentioning

confidence: 99%

“…A schematic of the 6.2L engine lubrication system and the locations of BFLRF oil pressure instrumentation are shown inFig. 9 (30). Gallery oil…”

mentioning

confidence: 99%

Low-Temperature Pumpability of U.S. Army Diesel Engine Oils

Frame¹,

Montemayor²,

Owens³

1989

SAE Technical Paper Series

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“…It was demonstrated that the severity of the problem varied greatly with engine design and that a major source of the problem could be caused by wax gelation or pour point reversion problems [85]. It was also shown that in the absence of wax problems, PMAs provided a superior performance to that of SIPs which, in turn, were superior to OCPs with the differences largest in the most severe engines [86]. This was confirmed with the additional observation that VI improver differences in performance were minimized for engines properly designed for low-temperature flow [87].…”

Section: Low-temperature Viscositymentioning

confidence: 95%

Viscosity Index Improvers and Thickeners

Stambaugh

Kinker

2009

Chemistry and Technology of Lubricants

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The viscosity index of an oil or an oil formulation is an important physical parameter. Viscosity index improvers, VIIs, are comprised of five main classes of polymers: polymethylmethacrylates (PMAs), olefin copolymers (OCPs), hydrogenated poly(styrene-co-butadiene or isoprene) (HSD/SIP/HRIs), esterified polystyrene-co-maleic anhydride (SPEs) and a combination of PMA/OCP systems. The chemistry, manufacture, dispersancy and utility of each class are described. The comparative functions, properties, thickening ability, dispersancy and degradation of VIIs are discussed. Permanent and temporary shear thinning of VII-thickened formulations are described and compared. The end-use performance and choice of VI improvers is discussed in terms of low-and high-temperature viscosities, journal bearing oil film thickness, fuel economy, oil consumption, high-temperature pumping efficiency and deposit control. Discussion of future developments concludes that VI improvers will evolve to meet new challenges of increased thermaloxidative degradation from increased engine operating temperatures, different base stocks of either synthetic base oils or vegetable oil-based, together with alcohol-or vegetable oil-based fuels. VI improvers must also evolve to deal with higher levels of fuel dilution and new types of sludge and also enhanced low-temperature requirements. IntroductionThe 'viscosity index', VI, was an important measure of quality early in the history of the lubricants industry, indicating an oil's potential applications over a wide range of temperatures, described in Section 1.3.2. Pennsylvania grade oils,~100 VI, were the standard against which all others were measured. Hydrogenation and solvent extraction processes were developed to upgrade lubricants from poorer quality crude oils, but the practical VI ceiling for 1930s refinery technology was~110-115.Early workers found that small amounts of rubber dissolved into mineral oil substantially raised VI; however, high levels of unsaturation in the polymer led to oxidation and sludge formation. This was overcome by using a synthetic polymer prepared from gasoline light ends [1], and similar behaviour was later described for 153 R.M. Mortier et al. (eds.), Chemistry and Technology of Lubricants, 3rd edn.,

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Viscosity index improvers and thickeners

Stambaugh¹

1992

Chemistry and Technology of Lubricants

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Low Temperature Pumpability of Engine oils

Cited by 14 publications

References 9 publications

Low-Temperature Pumpability of U.S. Army Diesel Engine Oils

Low-Temperature Pumpability of U.S. Army Diesel Engine Oils

Viscosity Index Improvers and Thickeners

Viscosity index improvers and thickeners

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