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Old 05-05-2013, 09:15 PM   #11
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Quote:
Originally Posted by Aron@Injected View Post
Have you measured vacuum pressure at the intake?
I'm not sure there is a free port on the intake to attach a gauge to. I could try to see if I get a reading on the OBD2 scan tool.
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Old 05-05-2013, 09:15 PM   #12
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Originally Posted by FocusTi View Post
Wouldn't the fuel being injected right into the cylinder help keep the valves clean? If you are using good fuel that it.
DI engines have no fuel in the intake ports.
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Old 05-05-2013, 09:16 PM   #13
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Direct Injection engines are known for acumulating carbon on the intake valves.
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Old 05-05-2013, 09:18 PM   #14
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Quote:
Originally Posted by Aron@Injected View Post
Makes sense. Let me know if you wanna try that maintenance we spoke about.

Sent you a PM. Thanks!
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Old 05-05-2013, 09:18 PM   #15
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Quote:
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Direct Injection engines are know for acumulating carbon on the intake valves.
Yep. Kills your head flow and power...
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Old 05-05-2013, 09:30 PM   #16
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Originally Posted by TORQUERULES View Post
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.
My buddy put a oil separator from the valve cover to intake air line and had not one drop of oil. It is possible oil vapors are far less. The main area is from the crankcase behind the manifold. James Baron Racing has detailed pictures of this.
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Old 05-05-2013, 09:44 PM   #17
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Quote:
Originally Posted by Aron@Injected View Post
Direct Injection engines are known for acumulating carbon on the intake valves.
Oh hell yeah. Look at Audi owners.
http://www.audizine.com/forum/showth...ad-for-RS4-4-2



And they were seeing it as low as 30k.
(Flap in the intake mani)
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Old 05-05-2013, 10:07 PM   #18
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From what I've seen they require maintenance every 15k miles. This isn't my thread, but we will have a offering to help guys encountering this problem.
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Old 05-05-2013, 10:09 PM   #19
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Quote:
Originally Posted by Brabs_Weather View Post
My buddy put a oil separator from the valve cover to intake air line and had not one drop of oil. It is possible oil vapors are far less. The main area is from the crankcase behind the manifold. James Baron Racing has detailed pictures of this.

I said the main source is from the PCV system. The valve cover breather is just extra insurance. And I did find oil film in he tube that connected it to the air inlet tube.

This is common practice in the Mustang, Lightning, etc. world for instance. No catch can is really needed there unless you have a lot of blow-by.

Now between the PCV valve and the intake, that is another story. A oil separator/catch can is a must.

Btw, if you engine is in good condition, your can won't collect a lot of oil in a short period of time. If it does, then you have problems. If you can empty it at oil change time and get maybe a table spoon or two, then you are fine. Hopefully less.

F/I engines usually collect more than N/A engines for obvious reasons.
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Old 05-05-2013, 10:28 PM   #20
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This reminds me I need a catch can still.
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