I sooo want to get rid of the purge valve. I just put silicone vac hose in my 7 and the thought of that damn valve spitting hot oil into those hoses makes me cross-eyed.

As I understand it, typically when people replace the purge valve they run a line to an air filter and another to an oil catch-can, or something like that. The bottom line is you can't just run a single line directly back into the motor.

I'm going to be yanking my OMP shortly...

So I had this thought this morning. How about removing the purge valve, having a line go to an air filter as per the usual and then the line that would go the catch can instead going to an OMP injector, thus dumping the oil back into the motor like god intended.

Most, if not all of the assembly, could be set up out of sight beneath the manifolds.

I'm guessing that either this is a fine idea that might need a little tweaking, or I'm missing some important details that would make this mod impossible/impractical.

Your learned comments, please.

 

knowing you, you make life complicated for entertainment

how's this bud... go out to ct, pick up a cheap $7 plastic fuel filter (so you can see through it) and splice it inline with the purge valve line to the intake.

TA-DA! DSM owners have been doing it for years, its simple, cheap, and very effective.

 

You're seriously worried about getting the inside of a hose dirty?!

We're not talking about oil pouring out of the engine here. It's just a just of oil vapour caused by heating the oil up. Even a catch-can is overkill on a rotary because the don't have blow-by like a piston engine does. Notice how tiny the lines are compared to the equivalent lines on a piston engine. Personally I think a couple of lines off the oil filler neck running under the car and left open would do the trick. As long as the system can breath it's fine. The purge valve is just part of the evaporative emissions system, so that fuel and oil vapour isn't dumped into the atmoshere.

 

http://www.geocities.com/MotorCity/G...technical.html


Pick # 7. Hot oil kills silicone hose (over time.)


In-line fuel filter? But if it clogs and I don't catch it... not good. I'll think about it some more. You're saying that the housing for some el-cheapo fuel filters is transparent?


I'd rather not vent the lines directly to atmosphere as I'm one of those nuts who'd rather not lose the ozone layer any sooner than we have to. You've commented on alternatives to my alternative, but what about the original idea itself?

 

That is correct. I've bought some in the past for other projects. You can see when its clogged by simply looking at the damn thing. If it's full of oil, time to change and buy another $2-5 filter they have them in the same aisle as the PCV valves.

Good luck

 

It's not hot oil, it's just a bit of oil vapour. Good info though.

Sounds like a reason to stick with nice cheap (non-rice) rubber lines.

 

Fingers - I'll check that out next chance I get...


I still don't like it.

Quote:

Sounds like a reason to stick with nice cheap (non-rice) rubber lines.

Since I got this hose for verra cheap, I want to protect it. Someday a bucketful of Viton would be nice.


Anyway, here comes Mr. Stick-in-the-mud...

Is the suggested modification possible/practical?

 

Mine i just rerouted back to a vacuum source

 

I'm pretty sure the system relies on the small amount of vacuum present in the inlet pipe or TID to draw the vapours out. It doesn't actually get blown out by the engine. Once you disconnect that hose the system pretty much stops working. The idea is just to ventilate it so that no pressure or vaccum can build in the sump. I really don't think any filter would be required. Also, how would you connect to an oil injector line?

 

NA - no TID.

I wouldn't connect to the line, but directly to the injector itself. Since the OMP, its lines and injectors (save one) would be removed, I would cap the oil line to that injector and run 4mm hose to what used to be the vac connection on the injector...

 

And you drive a rx7?

 

Yes, but I have trouble sleeping at night (to atone for it.)

 

I just have my filler neck hose connected to a check valve, then to the bottom of the intake manifold- it's injected in the manfifold at the closest possible point to the intake ports. I needed to apply vacuum to the oil pan, because my turbo drain line is a little convoluted. The vacuum really pulls all the oil in from the turbo drain- cleared up all my smoke. Oh, and that's why I have the check valve on the line too! Don't want boost blowing oil back up and past the seals! (Happened once when a check valve went)