A Spark-Plug Adapted for Measuring Cylinder-Head Temperatures

370141

01/01/1937

Event
Pre-1964 SAE Technical Papers
Authors Abstract
Content
A NEW method for adapting a spark-plug to the measurement of cylinder-head temperatures is described, consisting in leading thermocouple wires through two holes down through the shell of the spark-plug and bringing them into contact with each other in the surface of the rim exposed to the combustion-chamber.
Engine tests were conducted to compare results obtained by this method of measurement with those obtained with a central-electrode couple, and also a couple incorporated in the spark-plug gasket, all three devices being incorporated in the same plug.
The thermocouple mounted as described in the paper was more responsive to engine detonation than the thermocouple mounted in the gasket but less so than the thermocouple mounted in the central electrode. It was less responsive to changes in wind speed than the gasket couple in the case of an air-cooled engine but more so than the central-electrode couple, and it is believed that a couple mounted as described gives a truer indication of cylinder-wall operating temperatures than can be obtained by either of the other methods.
Meta TagsDetails
DOI
https://doi.org/10.4271/370141
Pages
3
Citation
Boerlage, G., and Cattaneo, A., "A Spark-Plug Adapted for Measuring Cylinder-Head Temperatures," SAE Technical Paper 370141, 1937, https://doi.org/10.4271/370141.
Additional Details
Publisher
Published
Jan 1, 1937
Product Code
370141
Content Type
Technical Paper
Language
English