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Camshaft Surface Temperatures in Fired-Gasoline Engines
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Abstract
The authors measured camshaft surface temperatures in two different gasoline engines: a Ford 2.3-liter overhead-camshaft engine with finger-follower and an Oldsmobile V-8 5.7-liter engine with rotating tappets and pushrods.
Using unique surface thermocouples in the cam-lobes, we found that maximum cam-lobe temperatures occur at the cam-nose and increase linearly with speed and oil temperature. At high speed, the rotating tappet produced lower temperatures than the finger-follower.
In addition, at maximum speed the cam-lobe temperatures in the ASTM Sequence V-D and IIID tests were similar--200°C. The similarity in these surface temperatures explains why both engines require similar zinc dithiophosphates (ZnDTP) for wear control. The surface temperature controls the surface chemistry.
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Authors
- J. A. McGeehan - Chevron Research and Technology Company Oronite Technology Division Richmond, California
- J. P. Graham - Chevron Research and Technology Company Oronite Technology Division Richmond, California
- E. S. Yamaguchi - Chevron Research and Technology Company Oronite Technology Division Richmond, California
Citation
McGeehan, J., Graham, J., and Yamaguchi, E., "Camshaft Surface Temperatures in Fired-Gasoline Engines," SAE Technical Paper 902162, 1990, https://doi.org/10.4271/902162.Also In
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