CCD (Combustion Chamber Deposit) Cleaning & BG44K

[FL C6 Avant]

Has anyone performed CCD cleaning?
Yes, I do occasional Italian tune ups
Yes, I do at least 1 redline weekly
Still concerned that over time there is calcified carbon buildup in the chambers.
I fully understand that with FSI any fuel system product will not be washing the backs of the intake valves,
but thinking there could conceivably be benefit from a product such as 44k (which i have used frequently in the past on PFI engines)
on the combustion chambers.
I should also mention that I only use top-tier 93 octane (usually the 'techron' branded gaz), but some literature would suggest that products specialising in removal/prevention of intake valve deposits (IVD) may actually promote CCD.

Discuss.

[Fmscell]

First off whats an Italian tune up?! Sounds expensive, exotic & possibly not reliable....I'm 2nd gen btw

[FL C6 Avant]

First off whats an Italian tune up?! Sounds expensive, exotic & possibly not reliable....I'm 2nd gen btw

Yeah, I'm C6.5 (Roots) even tho stage name is "C6".
Italian tune up is running 4000-6000 rpm for a few minutes with varying load.
get everything nice and hot.

[Baudi18t]

Lol, Italian tune up is basically hard driving, keeping the revs past 4k

[Fmscell]

The best way to get rid of deposits is blasting the intake chambers (valves shut) using crushed walnut media, in my opinion. Any direct injection engine, not only Audi, has the same issue of carbon build up on the intake valves, it's basically part of a tune up. It's a big job to do & all the dealers use this method to clean it. I wouldn't place my trust in an additive to do this job. That's just me.

[FL C6 Avant]

The best way to get rid of deposits is blasting the intake chambers (valves shut) using crushed walnut media, in my opinion. Any direct injection engine, not only Audi, has the same issue of carbon build up on the intake valves, it's basically part of a tune up. It's a big job to do & all the dealers use this method to clean it. I wouldn't place my trust in an additive to do this job. That's just me.

Thanks, but to be clear, I'm not talking about "carbon buildup" in the traditional sense of the intake ports/valves in the head.
I've not heard of shell blasting inside the cylinders, and I'm not planning to remove the cyl heads to clean it.

[Fmscell]

Oh. sorry I missed that...I've seen shops using a motorvac machine purged through an intake vacuum port to clean carbon scale in combustion chambers & on pistons. I would think a carboned up spark plug would reveal potential issues like blow by or a burned valve etc. But you are on the right track using high octane & fuel treatment cleaner (in tank) as preventive maintenance.

[Zba]

As long as you run good quality fuel you should have no need for a combustion chamber cleaning.

May I ask why you are interested in doing this?

As the OP mentioned: Where as a port injected engine sprays fuel on the back of the valve, valve stems and even intake runner walls, direct injected engines spray into the cylinder and miss the back of the valves where the carbon builds up. No in tank fuel additive will fix that. The only way to clean DFI valves is by removing the intake and using some elbow grease.

[FL C6 Avant]

As long as you run good quality fuel you should have no need for a combustion chamber cleaning.

May I ask why you are interested in doing this?

you might be right, but i'd sure like to see some forensic evidence confirming this.
interested because of LSPI.
wanna get rid of all the hotspots I can.

PS- I am the OP....

[Zba]

Take this for what it's worth:

I have only ever used top tier gasoline in my port injected engines. I have NEVER had any build up of any kind on the valves when I've pulled the intake off.
Obviously there will be some carbon build up on the pistons and the valve faces.

I turn wrenches for a living on high end cars too, very few cases of detonation due to deposits in the cc.

DFI/FSI cars are another story. The valves get so gunked up that they ping like crazy until they are thoroughly cleaned. No combustion chamber cleaning (aside from 44k) and they run like champs.

I run my cars hard too, I love WOT. Love it! Also my cars do not knock/detonate in any way which leads me to
believe that any carbon build up is minimal and not creating hot spots as the build up will be a uniform buildup.

Using shit gas will leave deposits which may have peaks and valleys which is where the hotspots and detonation comes from.

The short of it:

Drive it like you stole it!

[B5BAR]

Deposits are caused by a combination of fuel, and the oil you use. Even the best running engine burns oil, as oil flows down valve stems (very small quantities) and is on the cylinder walls by design. Add in crankcase vapors, and you have a fun little mix with the potential to make things a little dirty in those little round rooms. The oil you run, including it's quality, can also impact how clean your combustion chamber is.

I have had good luck running a good (meaning good not expensive) fully synthetic oil with AR9100 added in, and run a tank of techron, or AR6400-16 G every 5000 miles when I do an oil change. So far my engines appear to be keeping clean, and performing well with regards to power and overall fuel econ.

With regards to carbon buildup on valves, it is interesting to see discussion of oil additives helping prevent that as well. Great discussion in the B8-S4 forum regarding this other topic.

[bobashabiniu]

blasting the fifa coins intake chambers (valves shut) using crushed walnut media, in my opinion. Any direct injection engine, not only Audi, has the same issue of carbon build up on the intake valves, it's basically

[B5BAR]

blasting the fifa coins intake chambers (valves shut) using crushed walnut media, in my opinion. Any direct injection engine, not only Audi, has the same issue of carbon build up on the intake valves, it's basically

FWIW, intake track deposits is a side topic in this thread. The thread is more associated with combustion chamber deposits (where your pistons are located).