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At last year’s GMC, a paper was presented that described the conversion of a series of Cooper GMVA engines to turbocharged GMV engines while up-rating the horsepower of each unit in order to retire several older, inefficient units. This paper outlines the efforts and significant challenges in succesfully commissioning these engines. While commissioning the engines, and during subsequent engine operation , the engines exhibited a tendency to detonate even when operating at the prescribed air manifold pressure. A team of engineers and analysts was assembled to investigate the problem and find solutions. In parallel, physical investigations ensued through disassembly and visual inspection of engine components. The importance of adequate and equal air distribution to each cylinder, particularly in engines that will operate with a lean trapped air-to-fuel ratio to meet certain emissions limits, was one of the results that is described. On-engine investigation uncovered significant air imbalance, resulting in over-sensitive and unstable combustion. An engine flow simulation program was used to model flow in the engine, calculate the in-cylinder pressure and temperature of the unburned gases, and verified what was seen in the field testing and inspection work. Conventional methods of “cleaning the ports” were shown to be inadequate. Other issues, such as load changes on other engines when a different engine is being put online, or taken offline, were also addressed. The result has been the transformation of older engines, efficient in compressing gas, into up-rated, modernized, and now more reliable and fuel efficient engines, while producing lower emissions. This paper describes the process, problems and steps that were taken to identify and correct the problems.
Your Price $195.00
List Price $195.00