Intake pipe...

[PCGUY112887]

For those of you who have put a solid intake pipe on your 3x00 engine, where did you get the pipe and how did you mount the sensors? I need the pipe g\to reach forwards to the stock airbox, no cone filters for me.

Also where can I get a valve cover breather that would fit in our valvecovers? I have seen some at Autozone before but they were no where near fitting in my rear valvecover like I need...

Thanks!

[El_Diablo]

most just use gromets for the IAT sensor.... just get a straight aluminum tube the size you want and a u bend of the same specs, then add some couplers and your good to go

as for the breathers, dont do it, it actually improves the seal of the rings to have that vacume in the crankcase, if anything install a catch can

[PCGUY112887]

Well the tube that goes in the rear valve cover refuses to stay in so if no breather then I need to find some other way to keep it in there.

[Superdave]

Well the tube that goes in the rear valve cover refuses to stay in so if no breather then I need to find some other way to keep it in there.

i had mine zip-tied to something so it wouldn't pop out all the time.. then i ended up building a propper line for it that fit the intake tube perfect. It never fell out again..

[PCGUY112887]

Issue is mine doesn't come out of the hose, it actually comes out of the valve cover it's self! It doesn't go in correctly nor will it stay in there, no matter how hard I push it won't go in all the way....

It puzzles me since I am using the one that came with the 3500, it used to fit!

[3100 MPFI]

In my 3100 conversion in my 1988 Cutlass Supreme, I got a SMOOTH RUBBER INTAKE PIPE from a 1993 Cutlass Supreme 3100. It is the same as the 1994 ones, but a little longer does not have the grooves on the interior, and does not have a muffler.

PICS.

This is the stock 1993 setup with a 1994-1995 airduct. You can make out the muffler hanging off the bottom:


This is the stock 1993 setup with the proper 1993 airduct:


You might want to consider this as an option to the metal pipe. Next time I get over there, I will take some better pics of it.

[whitelightnin04MC]

I just used hose for the rear valve cover hose. I cut the hard line off of the fittings and reused them. Don't mind my electrical tape on the pcv line. It was a temporary fix.

As for the tubing, it's 3 or 3.5" aluminum. I can't remember. I ordered it from some speed shop in PA. I used that and some silicone couplers too.

[Azrael]

I need to replace my breather tube too. The intake I got from RSM (I didn't know better back then) forced the tube up against the EGR so it's half melted now. Whitelighting has the right idea. Cut the plastic tube from the ends (leave about 1/2 to 3/4" on each) and just use some 1/2" hose.

It should be ok to use a breather filter on the rear cover. The breather line goes between the TB and the air filter so it never sees vacuum. It's just a source of clean air for the PCV system.

[geoffinbc]

Guys the breather hose does not apply vacuum to the crankcase. The breather hose is attached to the intake tube before the throttle blade. All it does is allow the crankcase to breathe filtered air. If you want to add a breather filter the thats fine there will be no difference in performance. I found a breather from Spectre performance that fit my breather tube perfect. Spectre also sells intake plumbing.

It is the PCV valve that you do not want to remove. The PCV is what will apply vacuum to the crankcase to evacuate the crankcase gases. The breather is simply the fresh air supply so you actually get air flowing through the crankcase to evacuate the combustion gases.

[El_Diablo]

hmm, maybe next time your car is running you guys can remove the PCV and apply your finger to the end of the tube, tell me what it does

ive actually used the line to pull seafoam into the engine, holding the container about a half inch away, tell me how this is possible if theres no vacume to the line... and tell me how a pcv can create its own vacume pull... i would really like to know that

[geoffinbc]

Are you talking to me or the others?

I clearly said the PCV is what applies vacuum to the crankcase (obviously it does have a vacuum line) the breather is simply the inlet air supply.

[El_Diablo]

you... maybe its different with my car the but pcv and rear cover share the same tube that leads front to rear and meets in the middle at the intake

the PCV is basically a check valve

[PCGUY112887]

That tube does not go back to the rear valve cover, it goes from the PCV to the hole on the top of the intake then to something electrical (little black box, had a plug on it, I am not sure what it is). It is right next to the rear valve cover on a bracket...

The tube I am talking about goes from intake hose, before the TB and after the MAF, to a hole in the TB side of the rear valve cover. Mine is halfway pushed in there, I am sure it leaks however I hear nothing. My only fear is that it is allowing tons of air unregistered by the MAF into my engine, thus fucking with my tune.

[El_Diablo]

its going to the valve cover... how is that going to get into the combustion area? if your rings are leaking that bad you have other issues....

mine goes to the front and rear so i guess it is a bit different but if you open the rear the pcv will have no use except to basically "vent" the air in the crank case, its best if it pulls a vacume as this can help seal the rings thus creating more power (not much im sure but hey, everything counts)

[PCGUY112887]

Rear PCV? There is no rear PCV, it is just a hole. Hose goes from it so the intake hose so anything that comes out of the rear valve cover just goes into the intake and gets recycled.

Are we talking about the same engine here? 3x00 is what I mean, my old 96 3100 is setup exactly as I mentioned in my last post and so is my 3500.