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      07-13-2014, 03:59 PM   #1
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Carbon Build Up Question.

Will the F8X be susceptible to carbon build-up on the intake?

Will owners be actively carrying out Walnut Blasting as a preventative maintenance solution? I guess this would really only apply to owners who plan on keeping the car for a longer term.

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      07-13-2014, 04:03 PM   #2
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Quote:
Originally Posted by 16M3 View Post
Will the F8X be susceptible to carbon build-up on the intake?

Will owners be actively carrying out Walnut Blasting as a preventative maintenance solution? I guess this would really only apply to owners who plan on keeping the car for a longer term.

Thanks
Most of the time if you drive the car like you stole it, carbon build-up will be a non-issue.
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      07-13-2014, 04:07 PM   #3
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Quote:
Originally Posted by GBPackerfan1963 View Post
Most of the time if you drive the car like you stole it, carbon build-up will be a non-issue.
That is what I have heard, and that is what I have done with my current car. 6MT sport package. Maybe it was just something that was more prevalent in the E90?

I guess time will tell, I don't track (except Go Carts), but I have days where I am on it!!
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      07-13-2014, 05:18 PM   #4
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Quote:
Originally Posted by GBPackerfan1963 View Post
Most of the time if you drive the car like you stole it, carbon build-up will be a non-issue.
Ah, that's not exactly true.

I've heard every wive's tale about carbon buildup: drive it like you stole it, frequent oil changes, only use high tier gas, rub two chicken bones together over your hood every week, etc.

Unfortunately, carbon buildup is a price you pay for DI.

Now how bad is it going to be? We'll just have to wait and see until we see some S55s start to hit the 40k mile mark.
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      07-13-2014, 05:20 PM   #5
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Originally Posted by Jockey View Post
Ah, that's not exactly true.

I've heard every wive's tale about carbon buildup: drive it like you stole it, frequent oil changes, only use high tier gas, rub two chicken bones together over your hood every week, etc.

Unfortunately, carbon buildup is a price you pay for DI.

Now how bad is it going to be? We'll just have to wait and see until we see some S55s start to hit the 40k mile mark.
In the E39 M5, it was and still is an issue. Nothing that can't be coded out in the future.
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      07-13-2014, 05:23 PM   #6
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Speaking of, I need to get my valves cleaned but my local dealer quoted me $1400

Another dealer quoted me half that which is still high. I don't understand how one dealer is 2x the price of the other. You would think it would be a standard price. Time to find an indy shop that will do it.
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      07-13-2014, 08:16 PM   #7
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Quote:
Originally Posted by GBPackerfan1963 View Post
In the E39 M5, it was and still is an issue. Nothing that can't be coded out in the future.
I know the E39 M5 is expensive to operate and maintain long-term and has several known failures. This surprises me. Excessive carbon build-up is normally associated with Direct Injection motors as noted by another poster. The E39 M5 is not a DI motor is it? Why would there be excessive carbon build up?
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      07-13-2014, 08:27 PM   #8
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Quote:
Originally Posted by rngrjag
Quote:
Originally Posted by GBPackerfan1963 View Post
In the E39 M5, it was and still is an issue. Nothing that can't be coded out in the future.
I know the E39 M5 is expensive to operate and maintain long-term and has several known failures. This surprises me. Excessive carbon build-up is normally associated with Direct Injection motors as noted by another poster. The E39 M5 is not a DI motor is it? Why would there be excessive carbon build up?
It has to do with the secondary air pump system in 2000 and some 2001's. Very expensive fix that is only temporary. Most owners get a third party tune that eliminates the SES light that the issue causes.
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      07-13-2014, 08:30 PM   #9
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Ahhhhhh. Thanks for the knowledge. Learned something new. Love this forum!
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      07-13-2014, 09:00 PM   #10
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Turbo cars all have it, it's their nature.
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      07-13-2014, 10:03 PM   #11
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Quote:
Originally Posted by //M sa View Post
Turbo cars all have it, it's their nature.
Nothing to do with turbo. The problem is with direct injection. Many of the engines that suffer from carbon buildup are naturally aspirated engines with direct injection...
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      08-07-2014, 03:54 AM   #12
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I had this after 4 years on a October 2008 335 coupé. first the fuel injection pump caused problems every 10k miles, until they eventually changed the parts after the fifth occurence. then 1 year later they tell me that there's a massive carbon buildup and they had to replace half of the engine. my luck I was under extended warranty, the parts alone were 11k swiss francs... sold it a couple of months later, to order the M4
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      08-07-2014, 05:28 AM   #13
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Quote:
Originally Posted by Jockey View Post
Ah, that's not exactly true.

I've heard every wive's tale about carbon buildup: drive it like you stole it, frequent oil changes, only use high tier gas, rub two chicken bones together over your hood every week, etc.

Unfortunately, carbon buildup is a price you pay for DI.
.
Actually there is some truth in this. If you look at the intakes on BMW DI cars that are dedicated racecars, they are usually completely clean without carbon build up. The constant higher rpms mean the valves are moving faster, which combined with higher heat levels help keep them clean. Also they have less cold start cycles.

However, a,street car, no matter how hard it is driven does not see these kind of operating conditions.
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      08-07-2014, 09:59 AM   #14
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Quote:
Originally Posted by robbo mcs View Post
Actually there is some truth in this. If you look at the intakes on BMW DI cars that are dedicated racecars, they are usually completely clean without carbon build up. The constant higher rpms mean the valves are moving faster, which combined with higher heat levels help keep them clean. Also they have less cold start cycles.

However, a,street car, no matter how hard it is driven does not see these kind of operating conditions.
Ok, and how often are those engines tore down and rebuilt? Different fuel, etc.

You can't compare a race engine and a street engine. A street DI engine is going to have carbon buildup.
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      11-10-2017, 10:13 AM   #15
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Anyone know if carbon buildup is very common the F80 platform? Has anyone actually had walnut blasting done?
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      11-10-2017, 12:48 PM   #16
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meth/water injection will melt all your worries away
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      11-11-2017, 12:07 AM   #17
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I posted this in another thread. No build up seen at 60k miles. That was back in May.
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      11-12-2017, 04:51 AM   #18
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Audi massive engineering fail on the rs4 NA v8.

Lexus typical engineering prowess by adding port injection to keep things clean on their NA v8 in f lineup.
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      02-23-2018, 02:38 PM   #19
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good info

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      02-25-2018, 12:17 PM   #20
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M235i - 2014 89000km's. No issues with the carbonization of the intake valves. My mechanic is not seeing a major issue at all with any M engines with respect to this issue. Certainly not with N55 powered M2 I have or this M235i that I have and do love. The cam area was as clean as the intake valves. NO cleaning was warranted. BMW did a good job with valve timing and EGR per my dealer mechanic.

The attachment is from a recent valve box/cover replacement. At this time the intake valves were observed/analyzed. Very pleased!
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      02-25-2018, 05:15 PM   #21
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Quote:
Originally Posted by DSTR View Post
M235i - 2014 89000km's. No issues with the carbonization of the intake valves. My mechanic is not seeing a major issue at all with any M engines with respect to this issue. Certainly not with N55 powered M2 I have or this M235i that I have and do love. The cam area was as clean as the intake valves. NO cleaning was warranted. BMW did a good job with valve timing and EGR per my dealer mechanic.

The attachment is from a recent valve box/cover replacement. At this time the intake valves were observed/analyzed. Very pleased!
Well it is nice that your upper end was clean but the upper valve train build up is not the same as intake. I can only assume you drive longer intervals or more frequent oil changes.
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      02-25-2018, 11:43 PM   #22
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Quote:
Originally Posted by MRV99 View Post
Well it is nice that your upper end was clean but the upper valve train build up is not the same as intake. I can only assume you drive longer intervals or more frequent oil changes.
The valves were clean as noted in my post. I change at 15000km's. The M235i is driven daily as my M2 is as well. Short and longer durations, city etc. My mechanic is not dealing carbon as an issue with N55 overall.
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