I know there has been several threads on oil catch cans on this forum. I have been concerned about a PCV catch can because of direct injection intake valve problems on BMW and VW forums. However, people are not reporting deposits on intake valves on my google searches for F type. From descriptions of engine work, I assume forum members have examined/seen their intake valves. Are intake valves reasonably deposit free?

If there are no intake valve deposits, why don't Jag engines have the same issues as other direct injection engines? Looking at the V6 service manual that someone was kind enough to up load, the AJ126 engine has an oil/gas (vapor) separator that is proximal to the PCV valve (pg 10665). Is an engine internal separator not used in other manufacturers direct injection engines and therefore they need a PCV catch can (an external oil/vapor separator) to reduce deposits?

Just curious if anyone has any expertise on these issues. Thanks!

 

My catch can is collecting what the factory system is not. Jaguar uses a valve cover with it molded into the underside of the valve cover.

 

How much oil do you collect over how many miles?

 

It depends on how you drive it. The more you slam down on the gas the more blow by you create in the crankcase. Which is pressurizing the crankcase and out the pvc.

 

Here is a good video on this concept and the science behind it, etc.. As well as some empiricle data on the subject.


Enjoy!

DC

 

Well, I am not entirely sure about the specs on any of the 3 engines available in our cars, but I've found from other platforms that unless the Air Oil Seperator / PCV is really good, there will likely be carbon buildup on the back of the valves. However, if the motor utilizes both direct and port injection, you're good to go (Toyota engines, Gen 2 Ecoboost engines, etc).

I've done a carbon clean service on former vehicles and with the big German marques, less so on Mercedes, it's pretty common to walnut blast the gunk out. Some manufacturers do use cleaners to try and treat this issue, but sometimes the intake manifold needs to be pulled and the valves cleaned.

I would love to run a catch can on my 4-banger. Does anyone have any experience with this motor and the can/placement? Unfortunately, running a catch can will not stop build-up, but it's nice to get the crap out of the intake stream.

 

I think the question was how much *you* are collecting. It's understood that driving conditions will affect the result but what do you see? A teaspoon? A dram? A pint? A hogshead? Not many have installed one, so any quantitative information would help.

 

It's about two tablespoon every five thousand miles.

 

And which catch can did you install? Which brand & Model? Any photos of the install?

 

That’s a good testament to the onboard separator. My race cars would net a cup every race weekend(~120 miles).

 

Lots more pressure going on there.

 

For sure!

 

Has anyone used CVC or similar product to clean their intake valves? I’ve seen videos of it and although my car doesn’t have a lot of mileage, I still use fuel and cat cleaners - wouldn’t mind trying an intake valve spray as well.

 

Yep, I have.
Twice now.
Start here: https://www.jaguarforums.com/forum/x...5/#post2150403
Then go to posts 54 and 55 to see my experience.
I reckon it works.

 

thank you sir!

 

I have used the cleaners as well...And today when I added Meth injection and took the cover off, the valves are still pretty gunky. Besides the effective 116 Octane, and 100-degree cooler IAT's, the Methanol/H2O spray steam cleans the backs of the valves. A good thing on direct injection engines. May take it back apart after a while to see how well it cleans.

I am sure the cleaners help....Not saying they don't. I used the CVC stuff twice and CataClean for good measure to help keep it running well...

See below.

DC

 

I used cataclean two tanks ago and thinking I may do the intake cleaning this coming week. Also bought a case of redline - since I split my limited driving over several vehicles, I may just start adding half a bottle of redline to every or every other fill up. Not expecting miracles, but if I can keep the internals clean and improve the chances of the build-up-related failure, I'll do it. The additives are cheaper than one sensor and significantly cheaper than new cats - plus some increased performance wont hurt.

 

I am re-opening this thread, as I have some new disturbing findings in my 2017 F-Type V6 MT.

I just installed two catch cans on my V6, one on the Right Hand Side (Part Load Breather), and one on the Left Hand Side (Full Load Breather).
The installation placed the catch cans by the Air Filter and Fuse Box respectively.
(see photos and link K-MotorPerformance )

Yes, the factory engines have a circuitous route inside the valve covers for the breather gas and oil vapor to travel through to help reduce the amount of oil in the recirculated air.
(see Manual - Powertrain - Engine Emissions Controls - Description)

What I didn't expect is to have 20+ cc's of water and gas in the Right Hand Side (Part Load Breather) after 50 miles of driving today.
It was pretty brisk in Vermont today (-10*C, 14*F) and I did do some cold starts, but how could there be that much fuel in the engine breather system?

 

I recently filled the car with gasoline which reset the trip counter, so I think my moderate drive today netted less than 16 MPG (14.7 L/100km, 6.8 km/L)

Am I potentially looking at a faulty Outside Air Temp (OAT) sensor?
Or perhaps my newly installed catch can hoses have an air leak in them which affected the fuel/air mixture?
Why did the catch cans only catch gas and moisture on the "Light Load Breather?"

Thanks for any inputs in advance...

 

Here is an update on some Oil Catch Can operation.

Summary of my 2017 V6
1) the Light Load Breather catch can collected 10's of milliliters of water vapor and gasoline per tank full of gas during the winter months.
2) the High Load Breather did not collect anything
3) now in warmer weather conditions, the Light Load Breather catch can captures about 1 milliliter of oil per tank full of gas.
4) the High Load Breather does not catch anything (perhaps I am not driving hard enough).


High Load Breather (left side of engine)

Light Load Breather (right side of engine)