Quote:
Originally Posted by Red__Zed
Cat material is fairly regularly sucked into the engine when they go bad. You should try searching these things before posting about them.
I think you misunderstand the way the valves are timed. Overlap is very common.
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There is no exact proof in any of these online claims that broken cat material gets sucked back into the exhaust ports, from a reputable source.
Most of these claims are other online forums or ask the mechanic sites etc.