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post #2 of (permalink) Old 09-15-2017, 10:11 AM
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Just read that article. C/D pointed out one negative stating that engine knock could be detected when switching between spark plug and compression ignition. The knock can last up to one second and, because of the parameters, there isn't much that can be done about it. Mazda is trying to design some noise dampening around the block to minimize the noise and claims that the knocking isn't a wear issue. Maybe it's just me, but I thought that knock of any kind was bad on an engine if not remedied.
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