Over the last several years, there have been incidents of pre-ignition in large displacement Continental engines. In many cases, it was suspected that cracked or broken ceramic insulators on Champion Aerospace fine wire spark plugs were to blame. The issue led to Cirrus issuing a service bulletin for spark plug applications on its turbocharged models, as did Tornado Alley Turbo, for its aftermarket turbo-normalizing mod.
Subsequently, it turned out the problem wasn’t isolated to turbocharged engines—even normally aspirated engines were damaged.