z wrote:
> Like a lot of folks, I got tired of the air inlet for the PCV from the
> big air pipe after the air cleaner, puking up oil every once in a
> while and gumming up the throttle body, so I decided to swap over to
> one of those cute little filters that go over the inlet on the cam
> cover. (this is a honda b16 4 cylinder). The factory has that inlet
> connected with a short little hose to like an 11 mm diameter piece of
> steel tubing that goes into the air pipe. But that piece of tubing is
> siamesed for a ways with another piece of steel tubing which has a
> long hose at either end that goes from the block to the throttle body;
> since the hose at either end is plenty long enough I just took out the
> whole thing and used a piece of hose to go straight through, which is
> when I discovered it's a coolant hose.
>
> So, the question is, why, instead of just running a foot of hose to
> carry the coolant to the throttle body, do they use a foot of hose to
> run it through a steel tube siamesed to the steel tube that carries
> the input air for the PCV and then out another foot of hose? Are they
> trying to heat the air for the PCV up before it gets into the engine?
> Are they trying to cool the coolant before it gets to the throttle
> body? The mechanical stability for the thing is entirely from the PCV
> inlet connection at each end.
>
> What gives??

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They're guaranteeing that the pipe won't get iced up in winter time by
keeping it (toasty) warm.

'Curly'