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Old 05-05-2013, 07:22 PM   #1
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Thumbs up 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):





Phase 2 coming:





Last edited by TORQUERULES; 05-06-2013 at 04:37 PM.
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Old 05-05-2013, 07:48 PM   #2
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The catch can/separator is for the PCV side of the equation.
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Old 05-05-2013, 07:55 PM   #3
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Whose can is that? Never seen that one before.

You saw it cuz I tapped it
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Old 05-05-2013, 07:59 PM   #4
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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.
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Old 05-05-2013, 08:00 PM   #5
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Quote:
Originally Posted by amoosenamedhank View Post
Whose can is that? Never seen that one before.

You saw it cuz I tapped it
eBay. Has to be modified.
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Old 05-05-2013, 08:01 PM   #6
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Have you measured vacuum pressure at the intake?
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Old 05-05-2013, 08:11 PM   #7
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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.
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Old 05-05-2013, 08:12 PM   #8
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Quote:
Originally Posted by Aron@Injected View Post
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...
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Old 05-05-2013, 08:14 PM   #9
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Makes sense. Let me know if you wanna try that maintenance we spoke about.
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Old 05-05-2013, 08:14 PM   #10
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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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