JAXAshby wrote:
First an exhaust is a sealed system

???

If it's sealed, then how does exhaust get into and/or out of it? How
does water?

And how come you never answered my question about whether the engine is
functioning as an air pump when it's cranking over but not starting?

Jaxxie, if you can't help my quest for technical knowledge, I guess I'll
have to ask Navvie...

DSK