what is that tube, anyway
 

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??

Re: what is that tube, anyway
 

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??

-------------------------------------

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

'Curly'

Re: what is that tube, anyway
 

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??

-------------------------------------

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

'Curly'

Re: what is that tube, anyway
 

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??

-------------------------------------

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

'Curly'

Re: what is that tube, anyway
 

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??

-------------------------------------

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

'Curly'

Re: what is that tube, anyway
 

> 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??
>

That's the state of PCV systems today. In order to lower emissions they
run them so near the ragged edge of too little flow to keep the engine
clean that they have to HEAT the PCV air to keep the gookum from
condensing out and clogging it. This is why so many engines die of
"sludge" in the oil these days- the PCV systems are no longer flowing
enough air to keep the internals of the engine as clean as they once did.

Re: what is that tube, anyway
 

> 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??
>

That's the state of PCV systems today. In order to lower emissions they
run them so near the ragged edge of too little flow to keep the engine
clean that they have to HEAT the PCV air to keep the gookum from
condensing out and clogging it. This is why so many engines die of
"sludge" in the oil these days- the PCV systems are no longer flowing
enough air to keep the internals of the engine as clean as they once did.

Re: what is that tube, anyway
 

> 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??
>

That's the state of PCV systems today. In order to lower emissions they
run them so near the ragged edge of too little flow to keep the engine
clean that they have to HEAT the PCV air to keep the gookum from
condensing out and clogging it. This is why so many engines die of
"sludge" in the oil these days- the PCV systems are no longer flowing
enough air to keep the internals of the engine as clean as they once did.

Re: what is that tube, anyway
 

> 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??
>

That's the state of PCV systems today. In order to lower emissions they
run them so near the ragged edge of too little flow to keep the engine
clean that they have to HEAT the PCV air to keep the gookum from
condensing out and clogging it. This is why so many engines die of
"sludge" in the oil these days- the PCV systems are no longer flowing
enough air to keep the internals of the engine as clean as they once did.

Re: what is that tube, anyway
 

"z" <gzuckier@snail-mail.net> wrote in news:1171393512.507664.155340
@v45g2000cwv.googlegroups.com:

> 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,



If it's "puking up oil" then you've got a blowby or a sludge problem.
That's NOT normal.



> so I decided to swap over to
> one of those cute little filters that go over the inlet on the cam
> cover.



You'd have been wiser to spend your time and money figuring out what's
wrong with your engine instead.



(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.


Yep. Runs under the throttle body.


>
> 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?


That's possible. Icing can be a problem with small diameter lines that
carry ambient-temp air.

Although if that were the aim, don't you think they'd bond the two lines
together directly instead of insulating them from each other with that
black rubber thingy?


--
Tegger

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/

Re: what is that tube, anyway
 

"z" <gzuckier@snail-mail.net> wrote in news:1171393512.507664.155340
@v45g2000cwv.googlegroups.com:

> 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,



If it's "puking up oil" then you've got a blowby or a sludge problem.
That's NOT normal.



> so I decided to swap over to
> one of those cute little filters that go over the inlet on the cam
> cover.



You'd have been wiser to spend your time and money figuring out what's
wrong with your engine instead.



(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.


Yep. Runs under the throttle body.


>
> 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?


That's possible. Icing can be a problem with small diameter lines that
carry ambient-temp air.

Although if that were the aim, don't you think they'd bond the two lines
together directly instead of insulating them from each other with that
black rubber thingy?


--
Tegger

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/

Re: what is that tube, anyway
 

"z" <gzuckier@snail-mail.net> wrote in news:1171393512.507664.155340
@v45g2000cwv.googlegroups.com:

> 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,



If it's "puking up oil" then you've got a blowby or a sludge problem.
That's NOT normal.



> so I decided to swap over to
> one of those cute little filters that go over the inlet on the cam
> cover.



You'd have been wiser to spend your time and money figuring out what's
wrong with your engine instead.



(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.


Yep. Runs under the throttle body.


>
> 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?


That's possible. Icing can be a problem with small diameter lines that
carry ambient-temp air.

Although if that were the aim, don't you think they'd bond the two lines
together directly instead of insulating them from each other with that
black rubber thingy?


--
Tegger

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/

Re: what is that tube, anyway
 

"z" <gzuckier@snail-mail.net> wrote in news:1171393512.507664.155340
@v45g2000cwv.googlegroups.com:

> 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,



If it's "puking up oil" then you've got a blowby or a sludge problem.
That's NOT normal.



> so I decided to swap over to
> one of those cute little filters that go over the inlet on the cam
> cover.



You'd have been wiser to spend your time and money figuring out what's
wrong with your engine instead.



(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.


Yep. Runs under the throttle body.


>
> 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?


That's possible. Icing can be a problem with small diameter lines that
carry ambient-temp air.

Although if that were the aim, don't you think they'd bond the two lines
together directly instead of insulating them from each other with that
black rubber thingy?


--
Tegger

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/

Re: what is that tube, anyway
 

On Feb 13, 5:25 pm, Steve <n...@spam.thanks> wrote:
> > 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??
>
> That's the state of PCV systems today. In order to lower emissions they
> run them so near the ragged edge of too little flow to keep the engine
> clean that they have to HEAT the PCV air to keep the gookum from
> condensing out and clogging it. This is why so many engines die of
> "sludge" in the oil these days- the PCV systems are no longer flowing
> enough air to keep the internals of the engine as clean as they once did.


Mm. Never thought of that; heating to prevent the gook and/or ice from
clogging. Thanks, guys.

Re: what is that tube, anyway
 

On Feb 13, 5:25 pm, Steve <n...@spam.thanks> wrote:
> > 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??
>
> That's the state of PCV systems today. In order to lower emissions they
> run them so near the ragged edge of too little flow to keep the engine
> clean that they have to HEAT the PCV air to keep the gookum from
> condensing out and clogging it. This is why so many engines die of
> "sludge" in the oil these days- the PCV systems are no longer flowing
> enough air to keep the internals of the engine as clean as they once did.


Mm. Never thought of that; heating to prevent the gook and/or ice from
clogging. Thanks, guys.