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BMW 3-Series (E90 E92) Forum
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Intake Valves
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03-24-2018, 01:23 PM | #1 |
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This car has 14,500 miles on it. I decided to clean the valves while I had the manifold off to tap for a larger bov barb. Even after 15k miles it's this bad. The charge pipe was coated with oil.
Last edited by edf8fde; 03-24-2018 at 01:30 PM.. |
03-24-2018, 01:42 PM | #2 |
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I'd say that looks pretty normal for the mileage. The intake runner between valves isn't even caked in crud yet. LOL
Wait twice as long and you'll really be impressed! Wish I knew how many miles ago mine had been done when I did mine last year with 134k. Couldn't see any bare aluminum anywhere, and my charge pipe was dripping a small puddle of oil. There was so much buildup on mine I scraped most of it off with a flathead screwdriver before even trying to walnut blast it.
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03-26-2018, 08:35 AM | #3 | |
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Also, OP, as Rob said, these pictures of your intake is nothing compared to some nasty ones I have seen on here and in person!
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03-26-2018, 10:05 AM | #6 | |
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Even after 125,000 miles it helps smooth out idle is all I have see after doing this on three different cars. Edit.... Didn't notice who was who. After 148,000 it certainly is due. |
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03-26-2018, 10:08 AM | #7 |
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Well I did it on another car at 90k miles and the idle was much smoother as well as acceleration. Lookup other posts. Some people get back 15whp after cleaning them. Maybe huge was not the correct term, but it should be noticeable.
Haha, saw your edit, all good man. |
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03-26-2018, 06:49 PM | #8 | |
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2008 E61 535xi Sport Wagon / 100k Miles / Deep Sea Blue Metallic / Natural Brown Interior / MHD Stage 1 91 CA-Octane Tune.
SOLD - 2009 E90 335i M-Sport Sedan / 143k Miles / Alpine White Exterior / Chestnut Brown Interior / Mishimoto FMIC / xHP Stage 2. Last edited by MysticRob; 03-26-2018 at 07:12 PM.. |
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03-26-2018, 09:44 PM | #9 | ||||
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03-27-2018, 08:21 AM | #10 |
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what barb and tap are you guys using to put a new BOV vacuum line in? i bought one on amazon but they weren't the same size, went to Home Depot and the barbs were all much bigger than the taps.
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03-27-2018, 09:23 AM | #11 |
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Get a 1/4 npt 6mmID barb. I ordered mine online so it wasn't a brass fitting. Lowe's sells a 1/4npt Tap with drill bit for 10 bucks. I'll link the fitting I bought. What bov do you have?
http://koolance.com/nozzle-single-ba...s-steel-npt1-4 |
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03-27-2018, 10:53 AM | #12 |
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Typical catch-can isn't going to help you unless you spend all your time at high boost.
Install the RB external PCV kit. It collects the oil blow-by that occurs when manifold pressures are negative i.e. where they are 95% of the time the engine is on. I have both a BMW catch-can and the RB installed. The BMW collects a few teaspoons in 5K miles; the RB 3-4 ozs in 1000 miles. The low speed circuit is where the buildup on the intake is coming from. After installing the RB, no more walnut blasting required. Well, more precisely, the intake still looked clean after 20K miles. |
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03-27-2018, 11:45 AM | #13 | ||
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I just did my Valve COver and installed the RB PCV valve, is that the same thing you're talking about? I did my valve cleaning at 75,000 miles and when I looked last night at 95k, they were a mess. Again. I just installed the RB a week ago though. |
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03-27-2018, 11:59 AM | #14 |
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No, not just the PCV valve, the EXTERNAL PCV valve kit
http://www.rbturbo.com/rb-n54-external-pcv-kit There's a great thread on this somewhere on e90post |
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03-28-2018, 10:01 AM | #15 |
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I just posted pics of mine valves at 104k in a new thread ... it is .... uuuugly.
I have noticeable idle stumble and get misfire codes at high loads(JB4 turned off -- I can't use any extra boost at all right now). |
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