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The flow of lubricant as a mist in the piston assembly and crankcase of a fired gasoline engine: The effect of viscosity modifier and the link to lubricant degradation
Dyson, C.J. Lee, P.M.
Dyson, C.J.
Lee, P.M.
Publication Date
2024-10
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© The Author(s) 2024.
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Yes
Open Access status
openAccess
Accepted for publication
2024-10-08
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Abstract
Droplet flows, termed misting, are significant lubrication flow mechanisms to, in and around the piston assembly. Therefore, these are important in piston assembly tribology and engine performance. Crankcase lubricant degradation rate has been hypothesised to be influenced by lubricant droplet flows through the piston assembly and crankcase, but not previously confirmed.
Lubricant was sampled from the sump, top ring zone (TRZ), and mist and aerosol from the crankcase during an extend-ed run. The physical and chemical degradation of these samples was characterised. Droplet flows were intermediate in degradation and fuel dilution between TRZ and sump. Flows with smaller droplet sizes were more degraded that those with larger droplets. The degradation of polymers was dependent on their molecular architecture.
Version
Published version
Citation
Dyson CJ, Priest M and Lee PM (2024) The flow of lubricant as a mist in the piston assembly and crankcase of a fired gasoline engine: The effect of viscosity modifier and the link to lubricant degradation. Tribology Letters. 72: 126.
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Article