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Crankcase Flow Modeling for a Racing Motorcycle Engine
Technical Paper
2007-01-0266
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
When designing a sump system for a high performance engine the choice of the size of the inter-bay breathing passages is critical. The passages should be chosen to minimize the crankcase pumping loss and oil aeration while still maintaining adequate removal of blow-by gases and a good block structure.
This paper presents an approach to the modeling of engine crankcase gas flow using Ricardo WAVE software. The model was developed during the design of a dry sump version of a racing engine and was validated using pressure and blow-by data. The model was used to quantify gas velocities, pressure fluctuations and power loss due to the pumping of crankcase gas.
The effects of changes to a series of parameters such as breather hole size, sump volume, engine size and crankcase compression ratio were quantified.
This approach provides useful guidance in the design of dry sump systems at the concept design stage.
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Authors
Citation
Deighan, T. and Zuhdi, N., "Crankcase Flow Modeling for a Racing Motorcycle Engine," SAE Technical Paper 2007-01-0266, 2007, https://doi.org/10.4271/2007-01-0266.Also In
New SI Engine and Component Design and Engine Lubrication and Bearing Systems
Number: SP-2093; Published: 2007-04-16
Number: SP-2093; Published: 2007-04-16
References
- Ranganathan Raj P. ‘Engine Crankcase Pumping Flow Model’ SAE 1999-01-0215
- Dominici A ‘Crankcase Pumping Effects in Dry Sump High Performance Engines’ Aachener Kolloquium Fahrzueg- und Motorentechnik 2002