This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Reduction of Friction Losses in Crankcase at High Engine Speeds
Technical Paper
2006-01-3350
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Recently, engines achieving high power levels are becoming increasingly common. The trend is toward increasing the inflow of lubricating oil into the crankcase through several factors (for example, increasing the flow rate of the cooling oil jets in order to reduce the thermal load of the pistons). In addition, the mechanical losses induced by the motion of the crankshaft and connecting rods through the additional oil are intensified due to the higher engine speeds at maximum power.
In this article, we confirmed a method of separating the pumping loss and the agitation loss by measuring the pressure in the crankcase and an empirical formula was found for predicting pumping loss from displacement and ventilating area. We also investigated the effect of reducing the lubrication oil flow rate, as well as other factors affecting the oil flow, on the mechanical loss at high engine speeds.
Recommended Content
Authors
Citation
Ogawa, T., Suzuki, T., Ezaki, S., Suzuki, T. et al., "Reduction of Friction Losses in Crankcase at High Engine Speeds," SAE Technical Paper 2006-01-3350, 2006, https://doi.org/10.4271/2006-01-3350.Also In
References
- Toyokura T. Kamemoto K. “Hydrodynamics,” Jikkyo Syuppan 1976
- Kamiyama E. Yamada D. Suzuki T. Shimura T. “Sutudy of low friction engine,” Toyota technical review 50 2 Mar 2001
- Nagao A. Doino K. Yamashita A. Nishikawa T. Tanaka K. “Reduction of friction loss for MAGNUM engine,” Mazda technical review 1983