RM Engineering PCV Reroute Kit Info & Answers

At upper right:

 

What is directly under the fill spout? I thought there was some sort of baffle although obviously not designed for catching oil during crankcase ventilation I am hoping it will have some effect. I would still personally run this with a catch can.

It does appear that crankcase ventilation is being short circuited so the drivers side cylinders are not well ventilated which would result in more vapors condensing and entering the oil.Probably not a huge issue if you aren't trying to stretch your oil change interval but I would personally not be comfortable doing more than 5k when running this. Some oil testing may help determine its overall effect.

With this kit we are basically just moving the PCV connection from one corner to the other. Drainback under the oil filler should be significantly better though and the height of the filler neck likely acts as good buffer. I wonder if some sort of riser creating a buffer under the PCV valve would be helpful. If you did it after the PCV would the PCV prevent the oil from flowing back into the engine? Although if you are bothering to make a riser might as well throw a hose on it to have it drain back to the oil pan.... Of course then you need to add a fitting somewhere for it to drain into.

 

Done. I was trying to do it in the wrong place. Be updating again when my 6112, 5100 Bilstein get here. Ordered them from shock surplus last week, still haven’t shipped yet. They are pre-assembled so I guess that might take a bit.

 

If my truck was purely an offroading rig I would have no qualms about running this 100% of the time. I am just wary of second guessing toyota engineering choices that I don't 100% understand on my truck that I hope to have for the next 30+ years. It seems lots of mods and accessories out there end up reducing toyota reliability so I am just trying to figure out how to keep that while also improving the offroading situation.

 

Engine oil flow diagram from https://toyota-club.net/files/faq/13-11-10_faq_gr-engine_eng.htm

I wonder how much the PCV location is effecting the oil flow. I would hate for that upward flow to be reduced when not on an incline.

 

But in this kit, the PCV valve is in line. So would you change this?

 

Just a check valve.

 

No read up in the beginning of this thread, Plus, I spoke with the Creator of this kit, and he even said that that was the PCV valve.

 

Lots going on in a few of the recent posts. A few things

1: Yes, it is just moving the pickup location on the valve cover. That's the whole point. It's moved away from the location on the valve cover where oil pools in the head.

2: It is not just a check valve. These oem pcv valves are both a 1-way valve as well as a flow restriction so that the vacuum from the intake doesn't pull too much air through the crankcase causing a high idle situation. The in line PCV valve acts the same way.

3: Neither the OEM pcv valve or the valve in this kit affect the oil flow within the engine. Sure, if you are having oil consumption issues through the oem valve due to being on an incline or on a significant angle then yes you are consuming oil that would normally drain back into the pan.

4: You can run a catch can in line with this system. It doesn't hurt anything, it's just redundant. This is a very common question and there are a number of customers running this setup.

Hope that clears some things up.

 

Thanks again for taking the time to respond. Sounds like you put proper thought into PCV valve selection.

Number 3 is a very minor nit picky thing on my part that was just something I read about modern thin oil engines being designed with much smaller passages and with a precise finicky oiling design that takes crankcase ventilation flow into account in order to promote proper oil flow.

So once the engine stops ingesting the oil how does the engine do with oil starvation at extreme angles? I assume a vast improvement from not losing oil but I would think the poor drainback and the pickup being located in 1 corner could still cause problems after a bit. What have you found?

 

No worries, I have thought about it a good amount and had the same questions along the way.

The oil will still pool within the valve cover but any that would have normally been drawn into the intake and consumed is now still within the top of the cylinder head. Oil starvation at extreme angles however is another issue.

Friends of mine running this kit that I have watched in person have still seen oil starvation on extreme angles, but the truck isn't smoking. Oil starvation is an issue with the pickup in the oil pan. In those instances the oil within the pan just isn't reaching the pickup. A very common off-road fix for this is to overfill the oil by 1 quart or a little more. Obviously I wouldn't recommend doing this very long term but is a possibility.

I have also seen people running the 2gr in road racing/autocross events running into the same issues, smoking on hard right hand corners and oil starvation. There really isn't a good fix for the starvation other than modifying the pickup or running a dry sump oil system, but they have gone as far as to machine the rear of the cylinder head and add an external oil drain directly back to the pan. That would be the ideal fix but obviously is a significant amount of work.

 

Well we already know that Toyota's engineering choices are not always the greatest, otherwise we wouldn't be having this oil ingestion problem in the first place.

 

So how long has this kit been out that you came up with? What is the feedback that you are getting from people that are using it? I’m surprised there’s only two YouTube videos on this and it just concerns the installation.

 

It's been out for just over a year and feedback has been very positive. It solves the problem it's advertised to solve. Their trucks aren't smoking on inclines and they are happy with the ease of install.

 

Ordered mine end of May last year, been running it ever since on my daily driven rig, hasn't catastrophically failed yet Hell I forget it's even installed til I pop the hood lol

 

They definitely have not given enough thought and effort to offroad performance. Most of the time its about tradeoffs. This is one instance where it seems they could have significantly improved things without any real downside. Although there was probably pressure to use as much of the existing engine design/parts as possible.

 

Well, is it just Toyota or do other makes have the same issue? Does it just have to do with PCV valve location?

 

Is this specific to Toyota? Or have you sold it For other makes as well?

 

I've heard the Jeep 3.6L V6 has had the issue too. I can't recall having heard about it on anything else though myself.

 

You know what, my wife has a Jeep grand Cherokee that has a 3.6 in it and I did a PCV valve change on it last year and yes, it’s an exact same location. On top of the valve cover in the back. But I believe hers is on the passenger side if I remember correctly.