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11-07-2017, 09:21 AM | #1 |
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N55 Walnut Blast Before and After (with pics)
I've seen tons of before/after sets from N54's but very rarely do people do the same job on the N55's since it has been determined that they are less likely to build up carbon on the valves due to changes since the N54. Purpose of this post is just to help N55 owners find an example of carbon buildup vs an N54.
The attached images are from GoodMoodley who had his N55 walnut blasted at 45,000 miles while doing a turbo upgrade and some other work. It shows that there is some discoloration and slight carbon buildup, but nothing like what we'd see on an N54 with the same mileage. First two images are before the walnut blast, second two are after. He does not have a catch-can or any other intake mods that would impact these results. This isn't going to reflect results from every N55, but it can help give people an idea of what to expect. I'm approaching 75k miles in my 135 now and will likely do a walnut blast at 80k just as a preventative measure, and since it can only really help anyway.
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"Tobias" 2013 135i ///M-Sport 6MT • Pure Stage 1 • XDI 35 HPFP • 404whp/440wtq Last edited by Matticus91; 11-07-2017 at 01:35 PM.. |
11-07-2017, 11:27 AM | #2 |
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Big props for posting these pictures. There's been constant discussion on whether the N55 motors really do need walnut blasting or not. But nothing definitive and all conjecture as no one has actually had it done and posted pictures. Now we have an example of this.
Do you know if he was running a catch can? |
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desertman1232212.00 |
11-07-2017, 11:57 AM | #3 | |
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"Tobias" 2013 135i ///M-Sport 6MT • Pure Stage 1 • XDI 35 HPFP • 404whp/440wtq |
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11-07-2017, 12:09 PM | #4 |
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Have heard that they are not that effective. Anybody know for sure?
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11-07-2017, 12:14 PM | #5 | |
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Past: 1979 RX-7, 1980 Civic, 1989 B2200 lowrider, 1990 Golf GT, 1995 Civic Si Turbo, 2000 Civic SiR, 2000 328i, 2003 540i M-Sport, 2008 Rabbit, 2014 Pilot, 2002 A4 1.8T, 2009 A4 2.0T Quattro, 2017 CR-V Touring 2020 CR-V Touring
Current: 2012 135i, 2015 228i x-Drive, 2023 CR-V Touring Hybrid |
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Matticus913469.50 zx10guy5139.00 |
11-07-2017, 01:33 PM | #6 | |
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EE did a great video on this: Thanks for the info! That's great to hear that this is without a catch-can, I'd still like to see a car with one to compare but it's nice to see the valves were pretty clean on a stock setup.
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"Tobias" 2013 135i ///M-Sport 6MT • Pure Stage 1 • XDI 35 HPFP • 404whp/440wtq |
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Esteban42182.50 |
11-07-2017, 02:02 PM | #7 | ||
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11-07-2017, 03:03 PM | #8 |
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Here's the blurb from BMW's introductory doc for the N55:
Crankcase Ventilation The blow-by gasses flow into the settling chamber of the cylinder head cover through an opening located in the rear of the cover. Here, the blow-by gasses are directed through holes on to an impact plate, against which the oil impacts at high speed, and drains off. The blow-by gasses, cleaned of oil, flow via the pressure control valve (depending on the operating mode) through the non return valves into the inlet pipe upstream of the turbocharger, or via passages in the cylinder head ahead of the intake valves. The separated oil is drained via a return flow duct into the oil pan. Naturally Aspirated Mode The standard function can only be used as long as a vacuum prevails in the intake air manifold, i.e. in naturally-aspirated engine mode. With the engine operating in naturally-aspirated mode, the vacuum in the intake air manifold opens the non-return valve (15) in the blow-by duct within the cylinder head cover. This draws off blow-by gasses via the pressure control valve. At the same time, the vacuum also closes the second non-return valve (12) in the duct to the charge air intake pipe. The blow-by gasses flow via a distribution rail integrated in the cylinder head cover, through the intake passages (16) in the cylinder head, which lead directly into the intake ports, ahead of the valves. |
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blast, carbon, n55, valves, walnut |
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