B8 RS4 and engine carbon issues

[don]

....Except the Toyota DI engines....
But they cheat - they have direct injection and indirect injection. The indirect injectors fire something like every x pulses. Not enough to effect anything but enough to wash the valves.

Best idea I've heard of. At least the Japanese are doing something about it. I assume they have optimised the firing of the indirect injectors just enough so it keeps things clean.

Otherwise DI is a bit of a marketing joke. Gain 5% efficiency and power then lose the lot or more after 30k or so.

[adsgreen]

What's are the options available to clean up carbon build up?

1) manifold off, soak and elbow grease
2) that's it

Terraclean would be interesting to try but I'd want to see a before and after of the results.

[xxx_mojo_xxx]

Are the petrol additives any good as an alternative?

[Gizmo68]

The Terraclean looks interesting, but I’m not sure how or if it will work on a direct injection engine as no fuel will actually be covering the carbon covered valves and ports.

I’m happy to be proved wrong though.

[adsgreen]

The Terraclean looks interesting, but I’m not sure how or if it will work on a direct injection engine as no fuel will actually be covering the carbon covered valves and ports.

I’m happy to be proved wrong though.

well it can apparently clean cat's and o2 sensors soooo in theory the same process would find its way back into the intake manifold when egr is on.

[kiwi_mtm]

The Terraclean looks interesting, but I’m not sure how or if it will work on a direct injection engine as no fuel will actually be covering the carbon covered valves and ports.

I’m happy to be proved wrong though.

http://www.youtube.com/watch?v=p5SFUAp8 ... r_embedded

[Gizmo68]

The Terraclean looks interesting, but I’m not sure how or if it will work on a direct injection engine as no fuel will actually be covering the carbon covered valves and ports.

I’m happy to be proved wrong though.

http://www.youtube.com/watch?v=p5SFUAp8 ... r_embedded

Not a direct injection engine though is it.

If the Terraclean never goes through the inlet ports or valves inside the head (due to the fuel being injected directly into the cylinder on a direct injection engine) then what is going to clean them?

I appreciate the Terraclean is meant to clean the whole system right through to the exhaust tail pipes, but I am not sure how a gas is going to do this without first damaging the cat and secondly clean the inlet valves even via the EGR.

[adsgreen]

Well if you think about it like this...
If the intake deposits are a by product of combustion finding its way in.
So in theory any product that can survive combustion will also get dumped into the intake by the same process.

[drybeer]

Remembered watching this on "wheeler-dealers" some time ago...

Is this treatment any good to cure this issue? If so it seems an easy fix to do on a regular basis?

Watch from 6.30 on:

http://youtu.be/iQNSCnpxqcM

[TonyHayers]

Theres a terraclean agent just up the road from my office, might give it a shot on my b7 for the sake of £80 odd. See if there's some sort of measure of it's effectiveness beyond simply feeling better, maybe see if I can get it scoped before and after.

[adsgreen]

borescope through the spark plugs should do it. A SA member got some great shots pre and post water meth.

[Gizmo68]

That will only tell you half the story though as you will not see behind the valves and in the inlet port, where I gather the carbon build up will be the worst?

[Mr V10]

Oh FFS - not again, the B8 better not have carbon build up. Even though I haven’t owned a B7 RS 4, I feel like I’ve done the carbon journey with you all, and I’m exhausted. Die, carbon, die.

[Gizmo68]

Oh FFS - not again, the B8 better not have carbon build up.

ALL direct injection engines will suffer from carbon build up to a certain extent because the fuel does not wash over the back of the inlet valves or port. (it is the fuel that keeps the carbon build up down)

The RS4 V8 just appears to suffer the most.

[Mr V10]

Yeah, you know what I mean though, don't you?