This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
A Study of Lubricant Effects on Inlet Valve Deposits Using a Specially Adapted Test Vehicle
Annotation ability available
Sector:
Language:
English
Abstract
The increasing requirement to provide lubricants which assist in the efficient performance of engines has led to the study of valve deposits in a specially adapted gasoline engined road vehicle. The valve stem seals were removed from two of the four inlet valves. This has enabled the gross effects of lubricants on the total valve deposits to be studied over a period of 6,000 miles without oil change.
Four lubricants were studied in detail. The results were analysed with respect to lubricant effects on total valve deposits and any redistribution of deposits caused by the vehicle modification (inlet valve stem seal removed). These lubricants were also compared in standard field tests (36,000 miles) and selected European bench engine tests with respect to engine wear and deposits control. These data are compared with the results obtained in the modified vehicle valve deposits test. It was found that lubricant formulation influenced total valve deposits. General engine deposits & wear control for a particular lubricant does not necessarily correlate with total valve deposits formed. It was demonstrated that it was possible to formulate a lubricant to give excellent engine deposits & wear control, together with a low level of total valve deposits.
Recommended Content
Technical Paper | Evaluation of Commercial Oils on Brazilian Probol IB Test |
Technical Paper | The Build-Up of Oil Dilution by Gasoline and the Influence of Vehicle Usage Pattern |
Technical Paper | Gas Engines Valve and Seat Wear |
Authors
Citation
Carress, P., "A Study of Lubricant Effects on Inlet Valve Deposits Using a Specially Adapted Test Vehicle," SAE Technical Paper 922300, 1992, https://doi.org/10.4271/922300.Also In
References
- Benson J.D. “Some factors which affect Octane Requirement Increase” SAE 750933
- Esaki Y Ishiguro T Suzuki N Nakada M “Mechanism of intake valve deposit formation Part I - Characterization of deposits” SAE 900151
- Nomura Y Ohsawa K Ishiguro T Nakada M “Mechanism of intake valve deposit formation Part II - Simulation tests” SAE 900152
- Mikkonen S Niemi A Niemi M Niskala J “Effect of Engine Oil on Intake Valve Deposits” SAE 892111
- Bitting, B Gschwendtner F Kohlhepp W Kothe M Testroet C.J Ziwica K. H “Intake Valve Deposits - Fuel Detergency Requirements Revisited” SAE 872117
- Lepperhoff G Schommers J Weber, O Leonhardt H “Mechanism of the Deposit Formation at Inlet Valves” SAE 872115