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Measurement of Bore Distortion in a Firing Engine
Technical Paper
2002-01-0485
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Bore distortion was measured in a 2.0 liter in-line 4-cylinder gasoline engine, chosen because its siamesed bore design was expected to incur high bore distortion. The method adopted was to install 10 Micro-Epsilon eddy-current transducers in an invar carrier attached to the under crown of the piston. The transducers emerged through apertures in the piston at second ring level where they were in close proximity to the bore surface. A 2-beam linkage system was used to carry miniature co-axial cables to the engine exterior. Measurements were recorded at various speeds and loads up to 6000 rev/min.
Maximum bore distortion was 86 microns, arising from clamping loads, thermal effects and combustion pressure. The head bolts spaced around the bore gave rise to fourth order distortion, but the dominant influence was thermal loading which induced second order distortion, attributed directly to the siamesed bore design. The combustion pressure proved to have the least influence.
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Citation
Bird, L. and Gartside, R., "Measurement of Bore Distortion in a Firing Engine," SAE Technical Paper 2002-01-0485, 2002, https://doi.org/10.4271/2002-01-0485.Data Sets - Support Documents
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References
- PARKER, D A ADAMS, D R GRAHAM, N A Some Contributions of Instrumentation to the Understanding and Prediction of Piston and Ring Behavior Proc. ISATA 61 85 Graz 1979
- FURUHAMA, H YOSHIHARA, Y TAKAHARU, G FUJIMUTO, H ‘Measurement of Cylinder Bore Deformation during Actual Operating Engines’ SAE Paper 910042 1991
- KOCH, F FAHL, E HAAS, A ‘A New Technique for Measuring the Deformation of Cylinder Bores During Engine Operation’ SAE Paper 950540 1995