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Appendix F: Examples of Friction Reduction Opportunities for Main Engine Components
Pages 381-382

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From page 381...
... Rocker arms A 25 percent reduction in oil viscosity, which would be efwith low friction rollers are being applied. fective over a quarter of the drive cycles, would result in the following reduction in engine friction: Seals: Low friction crankshaft seals have been developed that eliminate the spring inside the disc that squeezes the lip 3  % fuel energy consumed by hydrodynamic lubrication of the disc against the crankshaft and provide more than 50 × 0.25 × 0.25 = 0.19% fuel energy percent reduction in friction.
From page 382...
... With an estimated 12 percent reduction in low viscosity reduction provides an overall estimate of 1.0 pertemperature viscosity, extrapolated from Table 2.3, and as- cent reduction for low friction lubricants - level 2. suming that this reduction would be effective over half of the drive cycles in which the oil is not fully warmed up, applying REFERENCES similar calculations used for level 1 for the energy consumed by hydrodynamic lubrication, above, yields a 0.5 percent Heywood, J.B.


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