Excessive Crankcase Pressures

Hi,

I´m the second owner of a 2007 Mazdaspeed 3, which I have owned for 3 years.

In Spain it is a very unknown car.

It is a mazdaspeed 3 without any modification.

25000 miles ago I changed the turbo and now it´s damaged again and it consumes a lot of oil from the exhaust.

I have seen that there is a Mazda TSB with a new valve cover and a newer TIH which match the current design on the 2nd Generation (Gen2).

I´m considering to install an Oil Catch Can (OCC), but I have seen that the installation solution proposed by CorkSport is not recommended by Damon Motorsport.


The reality is that I don't know how to solve my problem and choose the best solution.
What is the best solution, install the L3Y2-13-S80B KIT with a new valve cover and a newer TIH, install the Corkspot OCC or install the Damon Motorsport OCC with VTA kit?

Sorry for my bad english

Regards

 

Crank case pressure is an incredibly common problem for Mazdaspeeds and Damond has done extensive testing on different setups. Their OCC kits and routing suggestions are pretty much the gold standard for our cars.


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The PCV systems in these cars are not very good.

If you haven't replaced your PCV valve, that should be top priority for you. Following that install OCC. it will only help your system breath.

Damond has proven to me that they did their research, I would follow their directions.

 

According to Nishan at Speed Performance he recommends an oil cap breather (gen2 valve cover), and a breather on the other valve cover port and a sealed catch can with the pcv. He said its good for 700hp. Skip to 4:16.

Unless someone else can tell me otherwise I'll probably go this route.

If your turbo is burning oil the seals are probably bad and you need a new turbo or rebuild. They look just like piston rings. They're probably caked in oil.



Stock K04's are known to go bad from poor design. One solution is get a new turbo that has better oil control such as one from BNR http://bnrsupercars.com/. I believe starting at stage 1 they have better oil control. Installing a catless downpipe can also cause oil burning I heard from the stock turbo. Damon does sell a restrictor bolt https://damondmotorsports.com/collections/mazda/products/turbo-oil-restrictor-banjo-bolt.
I believe there's 2 generations of the K04. The gen 2's were less prone to oil burning. I've seen k04's on ebay for pretty cheap. I'm still new to the platform so plz correct me if I'm wrong.

 

It's all crankcase pressure related. Fix or upgrade your pcv system and it will go away.

The corksport tip moves the port to a location similar to the improved gen 2 design

 

I ghetto setup my system and it has been working well. My setup is

PCV to sealed catch can back to intake manifold "pretty standard"
10an on Valve Cover to damond check valve to filter
OEM Valve Cover to damond check valve to filter

This has been working well eve at 38 psi of boost.





https://mazdaspeeds.org/index.php?threads/valve-cover-vent.11316/

 

Do you know what the (ballpark?) cracking pressure of the damond valve is?

 

I believe it is like 1 or .5 psi it is very low. You can buy the valves solo.
https://damondmotorsports.com/products/check-valve?variant=1919243524

 

as has been said, you really want to setup a catch can while doing the other little things to minimize all the symptoms of that hot oily fog that lives inside the case.

one other related thing to be very aware of is carboned up valves. take a look, or run a swab past the throttle plate. If its not clean, you can assume you have that issue to deal with as well