STS 370Z Single Turbo System

Red__Zed

I've actually seen it happen, although almost exclusively on cars with pre-cats that are right on the end of the headers, and only when initiated by core failure



The turbine and the compressor aren't using the same air. I can't imagine chunks of cat hopping between housings

You can look at a picture of a turbo and pretty quickly figure out that core chunks aren't going to wind up in the intake.

blackonorange

Huh? You've seen it happen ? How ? I don't understand how they could get in the engine

Red__Zed

The short explanation is that there is some overlap between intake & exhaust valves opening. There is vacuum in the cylinder, and backwards airflow (backflow) is pretty common, generally sucking some small amount of exhaust gas back into the cylinder. In cases where a cat (again, generally a pre-cat because of their proximity to the exhaust ports) has broken down, you have
A) loose pieces of honeycomb floating around
B) significant increases in backflow

and it becomes technically possible for cat material to flow back into the engine.

blackonorange

When you say pre cat, you mean cat before the header ?

tower74

Yeah, I understand the two sides of a turbo...I was meaning in stopping inside the turbo and not going anywhere else....poor attempt at being a smart asz

But it flowing backwards??? If this is a somewhat or even a rare thing to happen I would hope that they would of already solved this kind of issue from ever happening.....At the same time I'm not a mechanic