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-   -   Keeping oil from coking up the intake valves on our DI engines (http://www.focusfanatics.com/forum/showthread.php?t=315870)

TORQUERULES 05-05-2013 08:22 PM

Keeping oil from coking up the intake valves on our DI engines
 
Ford is doing some things with their DI engines to minimize this, but oil still gets in there through the intake because of the PCV/breather system and there is no fuel hitting the intake valves to keep them clean.

Sooooo, a budget-minded two phase plan. Phase 1 finished (edit: gonna go a different route):

http://i11.photobucket.com/albums/a1...ps2fd3bfee.jpg

http://i11.photobucket.com/albums/a1...ps25a3e7d0.jpg

Phase 2 coming:

http://i11.photobucket.com/albums/a1...ps965592db.jpg

TORQUERULES 05-05-2013 08:48 PM

The catch can/separator is for the PCV side of the equation.

amoosenamedhank 05-05-2013 08:55 PM

Whose can is that? Never seen that one before.

You saw it cuz I tapped it

TORQUERULES 05-05-2013 08:59 PM

Oil can get into the intake from two sources. 1. The valve cover/cam cover breather system which I have just separated from the air intake and the PCV system which I am using h catch can for.

Most of it is from the PCV system, but the valve cover/cam cover breather gets some too.

The breather tube for the valve cover is mostly an emissions control system. Old engines, and racing engines, use an open breather here (many did not/do not even use a PCV system---on my Mustang I use a vacuum pump). The EPA does not want oil fumes into the air. Thus the tube I eliminated.

TORQUERULES 05-05-2013 09:00 PM

Quote:

Originally Posted by amoosenamedhank (Post 4714385)
Whose can is that? Never seen that one before.

You saw it cuz I tapped it

eBay. Has to be modified.

Aric@Injected 05-05-2013 09:01 PM

Have you measured vacuum pressure at the intake?

TORQUERULES 05-05-2013 09:11 PM

If you look at the tube coming from the cam cover you will find traces of oil. It doesn't take much to leave deposits on the valves.

The main culprit is the PCV system. I will work on that next.

TORQUERULES 05-05-2013 09:12 PM

Quote:

Originally Posted by Aron@Injected (Post 4714397)
Have you measured vacuum pressure at the intake?


Nope. I am just trying to do some preventive stuff here.

I am sure it is not a huge issue, but I am it taking chances. Lots of Audi owners spend a lot of money getting their valves cleaned. I have seen build up on non DI engines, so...

Aric@Injected 05-05-2013 09:14 PM

Makes sense. Let me know if you wanna try that maintenance we spoke about.

FocusTi 05-05-2013 09:14 PM

Wouldn't the fuel being injected right into the cylinder help keep the valves clean? If you are using good fuel that it.


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