Hey,

Does anyone know what the PCV hose dangling on the bottom of my engine connects to? It's a turbo'ed, carbed 13B by the way. I've got some smoke after it warms up and I'm pretty sure it's the PCV line. It's just hanging there sucking air. Any ideas would be appreciated.
NATE

 

Rx-7's don't have PCV. Can't help with the problem though, but it's not PCV.

 

My '80 has a PCV valve in the intake manifold right below the carb. -WG

 

Alright so you're saying this hose connects to the the intake manifold? I know all cars from like '75 on up have some sort of PCV. if one end of the hose connects to the intake where does the other side of it attach to?

 

You are completely wrong.

AdrenalifeRX7,

Are you referring to the PCV line connecting to the inlet on the intermediate housing, near the base of the oil filler tube? You need to elaborate on exactly what hose you're talking about here.

It's important to note that the specific routing and features of the PCV system varies from year to year.

As I recall, and this is purely from memory, the line on the intermediate housing comes from the charcoal canister (black plastic canister mounted to the firewall on an 82 anyways, but incorporated into the air cleaner lid for stock 79-80's). This comes from the gas tank vent line.

This is really just from recollection at the moment (car is stored far away from here) - I could be wrong, and you should check the service manual to be sure of the routing.

What is important in any case, is that the oil filler neck be allowed a fresh air vent. The best means for accomplishing this is a small breather filter on the nipple on the filler neck (which used to go to the stock PCV system.)

 

I'm completely wrong? Read your service manuels (I do) and tell me where the PCV system is. Just to make sure we're all talking about the same thing, what do you believe PCV stands for?

Also when you find the PCV system, write the various companies that make service manuels for the rx-7 and clue them in. Also write mazda so they can revise their owners manuels.

 

We must be talking about different things.

I believe PCV stands for Positive Crankcase Ventilation. This system most certainly does exist on first generation RX-7's - what do you think the charcoal cannister-->intermediate housing-->oil filler neck-->intake (plus the air vent solenoid on the stock carb, the ventilation and check valve, and whatever else I'm forgetting) system is for?

Disable the system and you'll quickly get slimy condensation in the oil filler - there's definitely some PCV going on!

I'm not sure if this is just an argument about literal terms - but in any case, this thread is about someone asking about a system which certainly *does* exist on first gen's, whatever you want to call it.

Not to mention, every manual I've ever seen has diagrams and explanations of this system.

 

UPDATE:

Haynes manual, page 97: Crankcase and evaporative emission control system.

Better read a little more carefully

 

Yeah, the manual says the valve is the altitude compensator. The part itself is a PCV or positive crankcase ventilation valve. When the rat's nest and all the other superfluous bs is removed from the motor, this valve is commonly used to provide ventilation by hooking it up to one of the pipe nipples on the oil seperator tube, as well as purging the tank.

No need for anybody's feathers to get ruffled, this ain't the lounge.
-WG

 

Whoa, started sounding like the 2nd Gen forum here for a minute

 

 

Jeeze guys, that's nothing... in fact I'd call it friendly discussion about a little disagreement.

You should see the Canadian forum.... I think it's jading me.

 

I'm not going to admit I'm wrong because I just to damn stuborn. But I've always read 7's don't have PCV systems. Also I've never seen anything in the manuels saying "PCV". I wrote my post while I was looking at my HAYNES manuel, page 97, I didn't reconise this as a "traditional" PCV system. But I see it is a "form" of venting the crankcase, so ya it efectively does the same job.

If I came off sounding hostle, it's because I had just woke up and was grumpy, I wasen't trying to be a hard ***.

But it's not a true PCV system,

 

Sorry for all the trouble, but thanks for the help anyways. I'm gonna take a look at it tomorrow and maybe I can be more descripitive at explaining exactly what I need help with. Thanks again guys.

 

Then what the hell did you think "crankcase ventilation system" was supposed to mean??

 

Hey man, I admited to the fact it is a form of crankcase ventilation, I even said it does effectively the same thing. Let it go :-) I'm not saying your "completely" wrong I'm just saying it is not a "P"CV system. Take a breath man.

Look at the descusion the same way as "the proper way to say potato or tomato"

 

It's all good man; no ill will intended.