intake valves cleaned

Nugget · 04-29-2012, 09:32 PM

Quote:

Originally Posted by Blauweisser

A general question: with direct-injection turbo-charged motors becoming mainstream (e.g., the new Falcon, new Mazdas etc) is this phenomenon likely to be more common, especially as short trips describe most of the motoring that people do?

Is this seen in indirect fuel injection motors?

I think manufacturers are starting to look at hybrid systems. Direct injection with part time traditional inlet injection. So you get the efficiency of direct injection and the cleaning effects of fuel going through the valves. Makes sense to me.

fontana302 · 04-30-2012, 04:57 AM

I'm surprised a valve job wouldn't have been done, heads surfaced, guides checked if it was that far down. I'd have done a before & after leak down. Seems a bit wierd to me to just disasemble & clean the heads/valves.

CrustyNoodle · 04-30-2012, 06:06 AM

Looks like the head didn't actually come off - is that correct?

Alext · 04-30-2012, 09:47 AM

VW actually recommend to drive their direct-injection engines at 3500-4500RPM (I think) for 20-30 minutes to help burn off the deposits that plague their valves....

I Think doing this a couple of times each month is worth it.

TimMc · 04-30-2012, 10:00 PM

Quote:

Originally Posted by Alext

VW actually recommend to drive their direct-injection engines at 3500-4500RPM (I think) for 20-30 minutes to help burn off the deposits that plague their valves....

I Think doing this a couple of times each month is worth it.

So that's about 200km/hr. Should get me up to the Sunshine Coast quickly tonight

Seriously, I'm not sure you can "burn" much off the cooler intake side of the engine?

RaihaX · 04-30-2012, 10:06 PM

that is a long time in 3500-4500 RPM!

Otaku · 05-01-2012, 11:32 PM

By this logic, does that mean we could run at 5500-6500rpm for 10-15 min and have the same effect?

Anyone AT tried using the launch control like this?

RaihaX · 05-02-2012, 12:06 AM

Quote:

Originally Posted by Otaku

By this logic, does that mean we could run at 5500-6500rpm for 10-15 min and have the same effect?

Anyone AT tried using the launch control like this?

you can try and find out

ps. you are not THE "otaku" that had the 335i full conversion to M3 that was on the car magazine a couple of years ago are you?

Otaku · 05-02-2012, 12:53 AM

Not the same otaku, but an "otaku" all the same! Haha... I would probably crazy enough to try and get the new M5 engine inside a 135i

Now THAT would be fun

Sorry to disappoint Rai...

RaihaX · 05-02-2012, 12:57 AM

Quote:

Originally Posted by Otaku

Not the same otaku, but an "otaku" all the same! Haha... I would probably crazy enough to try and get the new M5 engine inside a 135i

Now THAT would be fun

Sorry to disappoint Rai...

Haha, I used to be an Otaku as well

Got my nick (minus the X) a long time ago from a certain anime - the true test of an otaku if you know it...

Sorry a bit OT LOL.

Otaku · 05-02-2012, 03:10 AM

Quote:

Originally Posted by RaihaX

Haha, I used to be an Otaku as well

Got my nick (minus the X) a long time ago from a certain anime - the true test of an otaku if you know it...

Sorry a bit OT LOL.

Hmmm Flame of Recca? :P Old SKOOL, same time as Tenchi-Muyo!

LOL sorry also about the OT also...

RaihaX · 05-02-2012, 03:15 AM

Quote:

Originally Posted by Otaku

Hmmm Flame of Recca? :P Old SKOOL, same time as Tenchi-Muyo!

LOL sorry also about the OT also...

Good job

ok no more OT!

Alext · 05-04-2012, 06:55 PM

I just leave my DCT in 3rd or 4th on the highway at 100km/h to get in the RPM range. Done it on both my cars no problem. The engines are designed to run at such RPM of course (which really isn't high) esp for well engineered BMW ones haha!

It's the sustained mechanical action that helps loosen the build-up. Of course a complete clean would be superior.

I think VW actually had a service bulletin about it for their DI engines that are affected.

ansch · 05-05-2012, 01:24 AM

That's called an Italian tuneup

Jeef Beef · 05-05-2012, 09:11 PM

Quote:

Originally Posted by Blauweisser

A general question: with direct-injection turbo-charged motors becoming mainstream (e.g., the new Falcon, new Mazdas etc) is this phenomenon likely to be more common, especially as short trips describe most of the motoring that people do?

Is this seen in indirect fuel injection motors?

This is a big problem with DI engines because the cleaning agents added to fuel (BP ultimate etc.) never flows past the intake valves. Most of that gunk is from unburnt fuel flowing back into the intake via EGR and escaped engine oil also recirculated back thru the intake in order to be burnt off.

You can mitigate the buildup by installing an oil-catch can in order to intercept the engine oil fumes before they reach the intake. This however, does nothing to prevent EGR buildup.

This problem is not prevalent in indirect injection cars because the fuel is sprayed directly before the intake valves, letting the cleaning agents do their work. I don't see how engineers could have not foreseen this.

Another preventative measure that works well is METH INJECTION. That's right, you can tell your missus you are simply maintaining the health of your engine. Meth is sprayed before the intake so will do at least some good due to methanol having some cleaning qualities.

Quote:

Originally Posted by Nugget

I think manufacturers are starting to look at hybrid systems. Direct injection with part time traditional inlet injection. So you get the efficiency of direct injection and the cleaning effects of fuel going through the valves. Makes sense to me.

Both Audi and Toyota have adopted this 'hybrid injection' system. The indirect injection is used when the engine is just started and warming up, as well as at low loads and rpm. This is when buildup happens the most. Letting the cleaning agents in the fuel do their work occasionally does wonders too.

If any dealer tells you it's because you use 'bad fuel', they have no right to be giving any information. Obviously has no idea how fuel injection works in our cars.

flinchy · 05-07-2012, 04:38 AM

hmm so i'm understanding correctly in that the N52 doesn't get this sort of massive gunk buildup?

Jeef Beef · 05-07-2012, 05:05 AM

Quote:

Originally Posted by flinchy

hmm so i'm understanding correctly in that the N52 doesn't get this sort of massive gunk buildup?

It does not due to indirect injection. Unless the N52B30 is also DI?

flinchy · 05-07-2012, 06:15 AM

Quote:

Originally Posted by Jeef Beef

It does not due to indirect injection. Unless the N52B30 is also DI?

from my googling it's indirect, and a thread specifically stating it didn't have the same gunking issues that the 53/54 have i just found

this makes me a little happier that i won't need a $600 valve clean in such a fashion

510135 · 08-12-2012, 07:02 PM

looking to get this done, who else in brisbane is keen?

dan_brooks · 08-12-2012, 08:13 PM

Taking driving style etc out of the question, at approximately how many km's is this recommended to get done at?

510135 · 08-12-2012, 08:25 PM

I have done some reading and some guys get it done @80-90k kms. I am at about 55k and the car feels sluggish at times and hesitates. As I am the second owner I don't know how it was driven previously. I know how bad these cars can get with direct injection. I am all about preventative maintenance so to me it's sounds like a good idea.

BMW86 · 08-12-2012, 08:27 PM

Quote:

Originally Posted by nik0123

I have done some reading and some guys get it done @80-90k kms. I am at about 55k and the car feels sluggish at times and hesitates. As I am the second owner I don't know how it was driven previously. I know how bad these cars can get with direct injection. I am all about preventative maintenance so to me it's sounds like a good idea.

Get it done as soon as you get your meth installed Nick. The meth will help prevent it coming back.

04-30-2012, 04:57 AM	#24
fontana302 Private First Class 6 Rep 105 Posts Drives: 2012 E90 M3 Join Date: Aug 2007 Location: Brisbane, Australia iTrader: (0)	I'm surprised a valve job wouldn't have been done, heads surfaced, guides checked if it was that far down. I'd have done a before & after leak down. Seems a bit wierd to me to just disasemble & clean the heads/valves.
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04-30-2012, 06:06 AM	#25
CrustyNoodle First Lieutenant 12 Rep 317 Posts Drives: 135i DCT Join Date: Jun 2011 Location: Melbourne, Australia iTrader: (0)	Looks like the head didn't actually come off - is that correct? __________________ BMW - 135i DCT Audi - Q5 3.0TDI
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04-30-2012, 09:47 AM	#26
Alext Banned 142 Rep 2,042 Posts Drives: B M W Join Date: Apr 2008 Location: Everest iTrader: (2)	VW actually recommend to drive their direct-injection engines at 3500-4500RPM (I think) for 20-30 minutes to help burn off the deposits that plague their valves.... I Think doing this a couple of times each month is worth it.
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04-30-2012, 10:06 PM	#28
RaihaX Major General 156 Rep 4,995 Posts Drives: 08' 135i Join Date: Aug 2008 Location: Australia, Perth iTrader: (2)	that is a long time in 3500-4500 RPM!
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05-01-2012, 11:32 PM	#29
Otaku Private First Class 1 Rep 122 Posts Drives: Lemon Chicken Join Date: Feb 2012 Location: Australia iTrader: (0)	By this logic, does that mean we could run at 5500-6500rpm for 10-15 min and have the same effect? Anyone AT tried using the launch control like this?
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05-02-2012, 12:53 AM	#31
Otaku Private First Class 1 Rep 122 Posts Drives: Lemon Chicken Join Date: Feb 2012 Location: Australia iTrader: (0)	Not the same otaku, but an "otaku" all the same! Haha... I would probably crazy enough to try and get the new M5 engine inside a 135i Now THAT would be fun Sorry to disappoint Rai...
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05-04-2012, 06:55 PM	#35
Alext Banned 142 Rep 2,042 Posts Drives: B M W Join Date: Apr 2008 Location: Everest iTrader: (2)	I just leave my DCT in 3rd or 4th on the highway at 100km/h to get in the RPM range. Done it on both my cars no problem. The engines are designed to run at such RPM of course (which really isn't high) esp for well engineered BMW ones haha! It's the sustained mechanical action that helps loosen the build-up. Of course a complete clean would be superior. I think VW actually had a service bulletin about it for their DI engines that are affected.
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05-05-2012, 01:24 AM	#36
ansch Captain 33 Rep 646 Posts Drives: SGM 135i Join Date: Dec 2008 Location: Brisbane, Australia iTrader: (1)	That's called an Italian tuneup
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05-07-2012, 04:38 AM	#38
flinchy Brigadier General 128 Rep 3,099 Posts Drives: E82 135i Join Date: Nov 2011 Location: QLD, Australia iTrader: (0)	hmm so i'm understanding correctly in that the N52 doesn't get this sort of massive gunk buildup?
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08-12-2012, 07:02 PM	#41
510135 Captain 60 Rep 791 Posts Drives: f32 Join Date: Jan 2012 Location: Earth iTrader: (0)	looking to get this done, who else in brisbane is keen?
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08-12-2012, 08:13 PM	#42
dan_brooks Private 2 Rep 79 Posts Drives: '09 135i Manual Join Date: May 2012 Location: Brisbane iTrader: (0)	Taking driving style etc out of the question, at approximately how many km's is this recommended to get done at?
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08-12-2012, 08:25 PM	#43
510135 Captain 60 Rep 791 Posts Drives: f32 Join Date: Jan 2012 Location: Earth iTrader: (0)	I have done some reading and some guys get it done @80-90k kms. I am at about 55k and the car feels sluggish at times and hesitates. As I am the second owner I don't know how it was driven previously. I know how bad these cars can get with direct injection. I am all about preventative maintenance so to me it's sounds like a good idea.
	Appreciate 0 Quote