An Introduction to Engine Testing and Development by Richard D. Atkins

By Richard D. Atkins

This ebook provides the elemental ideas required for the checking out and improvement of inner combustion engine powertrain platforms, supplying the hot automobile engineer with the fundamental instruments required to successfully perform significant exams.

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2. The effect of the torsional stiffness of the coupling proposed, usually as a result of natural torsional frequencies of the installation in which the coupling is fitted. 3. The effect of the considerations in items 1 and 2 on the amount of heat generated in the coupling. This is of particular importance when rubber in shear or in direct tension or compression type couplings are considered. Z6 Example of a hook joint cardan shaft. (Courtesy of University of Sussex) 4. The effect of the coupling so far selected on the whirling characteristics of the whole coupling shaft.

A bleed-to-drain system is installed to allow a nominal amount of cooling water to leak away to the drain, usually about 1% of system capacity per day. Cooled water is pumped to the test cell area via a delivery pump and suitable pipe-work (pressure and flow regulated). At the test cell area, it can be branched off into individual test cells and, once there, via a water manifold to the different parts of the engine and dynamometer rig assembly. Individual cells can be isolated for maintenance and new installations by fitting shutoff or isolation valves at strategic points in the supply side of the cooling system, as shown.

1 and is described more fully later. 1 A test cell cooling water schematic. 22 An introduction t o Enqine Testinq and Development Function of the Raw Water Cooling Circuit The hot and cold wells provide a volume of water required for the running of numerous engine and dynamometer rigs under test at the same time. ) The wells provide the means for an infinitely variable and controllable engine heat range by controlling the flow and temperature of the raw water through the cell manifolds. This system is designed to provide instant engine cooling for repeated cold-start condition testing by rapidly dissipating the heat of the engine coolant at the heat exchangers.

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