Effects of oil properties on spark-ignition gasoline engine friction

Skjoedt, Martin; Butts, Ryan J.; Assanis, Dennis N.; Bohac, Stanislav V.

doi:10.1016/j.triboint.2007.12.001

Cited by 41 publications

(23 citation statements)

References 15 publications

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“…The lubricating performance of engine oil can be replicated by conducting endurance test on an engine test rig under cyclic loading conditions. 24,25,27 The endurance test is mandated by all original equipment manufacturers (OEMs) to assess the service life of the engine as well as lubricating oil. The endurance test is normally conducted for 60–300 h under varying load and speed conditions depending on the type of engine and class of the engine like two-wheelers/four-wheelers.…”

Section: Methodsmentioning

confidence: 99%

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Investigation of tribological properties and engine performance of polyol ester–based bio-lubricant: Commercial motorbike engine oil blends

Mouli

Srinivas

Vandana

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part D:

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This article explores the influence of blending polyol ester–based bio-lubricant with commercial lubricant on engine performance. Polyol esters trimethylolpropane ester and pentaerythritol ester were prepared from Calophyllum inophyllum seeds. Extreme care was taken to minimize deterioration of physicochemical properties when blending bio-lubricant with commercial oil. Blending of bio-lubricant with commercial oil was carried out in 10%, 15%, 20% and 25% volume. The test oils were first investigated for wear and friction properties on a four-ball wear tester. Optimum blending ratio was calculated from results of tribological properties, and the blend with optimum blend ratio was investigated for engine performance. The engine performance of the optimum blends was evaluated by conducting a 60-h endurance test on a motorbike. Significant improvement in tribological properties was observed up to a blending percentage of 15% when blending pentaerythritol ester with commercial oil. In the case of trimethylolpropane ester–based bio-lubricant, 10% blending with commercial oil gave optimum performance. The novel evaluation of engine performance of commercial oil and blends has shown a reduction in the wear of engine components with an encouraging decrease in fuel consumption. Metallographic studies conducted on worn piston rings reveal synergy between additives in the commercial oil and esters in the bio-lubricant in reducing wear and friction, thereby reducing fuel consumption.

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Section: Methodsmentioning

confidence: 99%

“…Several researchers 1–33 have studied the use of bio-based lubricants for commercial applications. Use of esters obtained from trees which yield oil-bearing materials can help develop new-class lubricant formulations, thereby reducing the percentage of toxicity and improvement in eventual biodegradability of thelubricant.…”

Section: Introductionmentioning

confidence: 99%

Investigation of tribological properties and engine performance of polyol ester–based bio-lubricant: Commercial motorbike engine oil blends

Mouli

Srinivas

Vandana

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…Several alternative lubricant chemistries are currently being developed specifically for low viscosity engine lubrication such as ionic liquids [10] and polyalkylene glycol based [11,12] lubricants. Despite the apparent large difference of 25% and more in the lubricant viscosities (see Table 1), the corresponding effect on engine friction is much smaller [13][14][15] and highly accurate test-rigs are required to measure the benefit of the individual lubricants experimentally.…”

Section: Introductionmentioning

confidence: 99%

Friction Reduction Tested for a Downsized Diesel Engine with Low-Viscosity Lubricants Including a Novel Polyalkylene Glycol

et al. 2017

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Abstract:With the increasing pressure to reduce emissions, friction reduction is always an up-to-date topic in the automotive industry. Among the various possibilities to reduce mechanical friction, the usage of a low-viscosity lubricant in the engine is one of the most effective and most economic options. Therefore, lubricants of continuously lower viscosity are being developed and offered on the market that promise to reduce engine friction while avoiding deleterious mixed lubrication and wear. In this work, a 1.6 L downsized Diesel engine is used on a highly accurate engine friction test-rig to determine the potential for friction reduction using low viscosity lubricants under realistic operating conditions including high engine loads. In particular, two hydrocarbon-based lubricants, 0W30 and 0W20, are investigated as well as a novel experimental lubricant, which is based on a polyalkylene glycol base stock. Total engine friction is measured for all three lubricants, which show a general 5% advantage for the 0W20 in comparison to the 0W30 lubricant. The polyalkylene glycol-based lubricant, however, shows strongly reduced friction losses, which are about 25% smaller than for the 0W20 lubricant. As the 0W20 and the polyalkylene glycol-based lubricant have the same HTHS-viscosity , the findings contradict the common understanding that the HTHS-viscosity is the dominant driver related to the friction losses.

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“…Besides quantifying the losses, a comparison to works from literature and an investigation of the friction reduction potential of the highly loaded journal bearings using ultra-low viscosity lubricants [7][8][9] is also presented.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Journal Bearing Friction Losses in a Heavy-Duty Diesel Engine

et al. 2015

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Internal combustion engines (ICE) for the use in heavy-duty trucks and buses have to fulfil demanding requirements for both vehicle efficiency as well as for emission of greenhouse gases. Beside the piston assembly the journal bearings are among the largest contributors to friction in the ICE. Through a combination of measurements and validated simulation methods the journal bearing friction losses of a state-of-the-art heavy-duty Diesel engine are investigated for a large range of real world operating conditions. To this task recently developed and extensively validated simulation methods are used together with realistic lubricant models that consider the Non-Newtonian behaviour as well as the piezoviscous effect. In addition, the potential for further friction reduction with the use of ultra-low viscosity lubricants is explored. The results reveal a potential of about 8% friction reduction in the journal bearings using a 0W20 ultra-low viscosity oil with an HTHS-viscosity (The HTHS-viscosity is defined as the dynamic viscosity of the lubricant measured at 150• C and at a shear rate of 10 6 s −1 ) of 3.6 mPa s. For the investigated engine, HTHS-viscosity limitations are determined which indicate that the use of lubricants with further reduced HTHS-viscosity would require engine and/or journal bearing modifications to be able to maintain the high service life of the engine.

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Effects of oil properties on spark-ignition gasoline engine friction

Cited by 41 publications

References 15 publications

Investigation of tribological properties and engine performance of polyol ester–based bio-lubricant: Commercial motorbike engine oil blends

Investigation of tribological properties and engine performance of polyol ester–based bio-lubricant: Commercial motorbike engine oil blends

Friction Reduction Tested for a Downsized Diesel Engine with Low-Viscosity Lubricants Including a Novel Polyalkylene Glycol

Analysis of the Journal Bearing Friction Losses in a Heavy-Duty Diesel Engine

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