What does this hose do?

[rs97eclipse1695]

can someone tell me what this line does? im guessing it lets air into the head to cool the cam shafts and such...but mines busted...put some duct tape on it and zip ties to hold me long enough to drive to auto zone and do something else about it...but it makes me nervous and is getting fixed today one way or another

[SLoe]

Positive Crankcase Ventilation ( PCV ) valve. Is the line busted or the valve? Doesn't matter, go to the parts store get a new hose or valve.... problem solved. The PVC system circulates fresh filtered air through the crankcase mixes it with blow-by gasses and sends it through the PCV valve to the intake and finally to the combustion chamber to be burned.

[kjewer1]

You got the description right, I'm just in a mood to ramble suddenly... To elaborate, the PCV is simply a one way valve that allows the intake manifold vacuum to draw a vacuum on the crankcase. That vacuum is to evacuate any unburned hydrocarbons that made it past the piston rings and various other parts into the crankcase, which would normally be at atmospheric pressure.

There is also a vent line going to the intake in most cases. It has two purposes. One is to allow for air to move through the crankcase, or at least the head. With a vacuum pulled on a closed system, there is no flow. Allowing air to enter the system will provide some flow. Another reason it is there is to vent excess crankcase pressure (positive pressure). This is only an issue with high mileage NTs and turbo cars. The PCV valve will close under boost with turbo cars to prevent manifold air from moving into the head/crankcase, so there needs to be another vent.

I usually eliminate this system on race cars, but you need it intact if you want to be legal.

[spyderturbo007]

Originally Posted by 95 GSXracer

I'm just in a mood to ramble suddenly...

If you never rambled, I don't think I would know anything about my car!

As always, thanks for the education.

[SLoe]

Originally Posted by 95 GSXracer

You got the description right, I'm just in a mood to ramble suddenly... To elaborate,

That's cool, I wasn't going into too many details to a guy who was fixing his car with duct tape and zip-ties (no offense intended).

[spyderturbo007]

Originally Posted by loeman

That's cool, I wasn't going into too many details to a guy who was fixing his car with duct tape and zip-ties (no offense intended).

Come on now, it's a DSM.

Hell, when you can do all of your beginning mods with items from Home Depot, what's wrong with a little duct tape.

[SLoe]

Point taken.

[rs97eclipse1695]

i love this site...haha

nah it was sunday when it happened...nothing was open...only option was zip ties and duct tape...got the hose on order...and replacing it as soon as its in...thanks for all the info though...i feel smarter :-p...but i do know a little about engines and such..in a shop class rebuilding a small engine...so i got the jist of what was said...thanks guys

[complex_eclipse]

hey no one can make fun of duct take it's just like star wars it have a light and dark side and hold the universe together. And not only that but on a lot of millitary choppers it is used to protect the blades from being sandblasted during flight

[rs97eclipse1695]

dont care who you are duct tape is the shit

its either duct or fucked

[rs97eclipse1695]

ok...gotta delete the pic from the host...so it wont show here anymore...for future referance...its the hose dirctly to the right of the oil cap on the 420a

[defiancy]

Originally Posted by complex_eclipse

And not only that but on a lot of millitary choppers it is used to protect the blades from being sandblasted during flight

Um no.


They use a clear adhesive tape, nicknamed blade tape. It's nothing like duct tape, and it's a real bitch to get off when you have to replace it.