Carbon Clean on 4.2l V8
Discussion
The cheapest places for media blasting seem to be the BMW/Mini specialists, who do walnut grit blasting as it's the BMW-authorised decoking method. It's much cheaper than the manual, chemical-intensive decoking process that most VW specialists use, though I think some have started adopting it now. http://www.minitorque.com/forum/f15/walnut-shell-d...
As the above poster says, the Terraclean type stuff won't work on FSI engines- or at least, not with the standard set of attachments most garages that do it seem to use. Apparently there's a set of tools specifically for cleaning direct injection engines but I've never found anywhere that actually has them.
As the above poster says, the Terraclean type stuff won't work on FSI engines- or at least, not with the standard set of attachments most garages that do it seem to use. Apparently there's a set of tools specifically for cleaning direct injection engines but I've never found anywhere that actually has them.
Personally I do believe that these products CAN have a positive effect however in my experience there is a major flaw in the delivery.
I was skeptical also so popped along to see a V8 Audi undergo a couple of treatments of the BG system for fuel injected cars where the product is sprayed directly into the air intake so it passes over the inlet valves. The head was then removed and to my surprise there was a significant reduction in carbon, however it was only on one port.
The chemicals simply followed the path of least resistance and did an excellent job of cleaning just 1 of the 8 ports
My opinion is that these systems will most likely give a significant improvement for a 4 pot engine but pretty useless on the V6, V8 or V10.
I cant see how the hydrogen option will be any more effective than the BG one.
I was skeptical also so popped along to see a V8 Audi undergo a couple of treatments of the BG system for fuel injected cars where the product is sprayed directly into the air intake so it passes over the inlet valves. The head was then removed and to my surprise there was a significant reduction in carbon, however it was only on one port.
The chemicals simply followed the path of least resistance and did an excellent job of cleaning just 1 of the 8 ports
My opinion is that these systems will most likely give a significant improvement for a 4 pot engine but pretty useless on the V6, V8 or V10.
I cant see how the hydrogen option will be any more effective than the BG one.
hman said:
the chemical clean systems logically dump the carbon into your catalytic converter - which on my 3.2v6 means the gearbox has to come out if the catalytic needs to be changed on the drivers side.
True but im not aware of any reports personally and lets not forget there's a chemical clean for that http://www.cataclean.com/emissions-crusade/new-loo...
hman said:
no - it wont, because the injector is on the wrong side of the valves to clean the carbon build up.
Either manual with a tooth pick, or media blasting - both are a pain in the bum to be fair so only do it if you are really sure you need to eg. EML, misfires (check plugs first) etc.
It's well worth doing on the 4.2 v8 engines (FSI ones especially like in the B7 RS4, Audi R8 etc). Irrespective of any "faults". Either manual with a tooth pick, or media blasting - both are a pain in the bum to be fair so only do it if you are really sure you need to eg. EML, misfires (check plugs first) etc.
They clog up like crazy, all of the TFSI's do.
You need to remove the inlets and clean them properly, use petrol and a hoover with a straw and a toothpick.
Best way to reduce it is bin the PCV system and use the bestest fuel.
Lostprophet said:
Hi,
The chap said the following
"No this is engine carbon clean terra clean are another company, we go in the air inlet they go in the fuel system"
Thats not true.The chap said the following
"No this is engine carbon clean terra clean are another company, we go in the air inlet they go in the fuel system"
Terraclean do offer a way of injecting the chemicals directly into the inlet just as the hydrogen system but as i have said whatever is sprayed/injected in will simply follow the path of least resistance.
Terracleans option - http://www.terraclean.net/product.php?id=84
BG's option - https://www.bgprod.com/catalog/gasoline-fuel-syste...
xjay1337 said:
hman said:
no - it wont, because the injector is on the wrong side of the valves to clean the carbon build up.
Either manual with a tooth pick, or media blasting - both are a pain in the bum to be fair so only do it if you are really sure you need to eg. EML, misfires (check plugs first) etc.
It's well worth doing on the 4.2 v8 engines (FSI ones especially like in the B7 RS4, Audi R8 etc). Irrespective of any "faults". Either manual with a tooth pick, or media blasting - both are a pain in the bum to be fair so only do it if you are really sure you need to eg. EML, misfires (check plugs first) etc.
They clog up like crazy, all of the TFSI's do.
You need to remove the inlets and clean them properly, use petrol and a hoover with a straw and a toothpick.
Best way to reduce it is bin the PCV system and use the bestest fuel.
I'll answer that with some do and some dont, not all of them, in fact the TFSI's are rumoured to be better at not coking due to higher charge temps, there are a lot of GTI's which are just fine, I ran a B7 TFSI from 0-80,000 miles and it didnt suffer any coking problems.
"You need to remove the inlets and clean them properly,"
Yes - Agree
"use petrol and a hoover with a straw and a toothpick."
No , NO NO NO NO its a really dangerous thing to do putting petrol vapour through a non EEX protected appliance, and the toothpick method is VERY time consuming, Walnut media is the quickest and safest hence why BMW do it that way already.
"Best way to reduce it is bin the PCV system and use the bestest fuel"
Neither makes a vast amount of difference, its the valve overlap which causes it which isnt something anyone can change.
Things with the internetz is that its the complainers who get noticed, there are a s
tload of FSI and TFSI engines out there with no coking issues at all but there are plenty of companies who would like your money for a clean up.hman said:
Things with the internetz is that its the complainers who get noticed, there are a stload of FSI and TFSI engines out there with no coking issues at all but there are plenty of companies who would like your money for a clean up.
Agreed, my S6 has just turned 90k and all the misfire faults i have had over 4 years were not related to carbon build up; the internet said otherwise of course.tload of FSI and TFSI engines out there with no coking issues at all but there are plenty of companies who would like your money for a clean up.xjay1337 said:
Best way to reduce it is bin the PCV system and use the bestest fuel.
Oil quality seems to have a big impact on it. Reduce the amount of oil being burned, reduce the build-up AFAIK.FWIW, mines one 91k miles, has never been decoked and wasn't too bad last service despite burning about 1L every 3-4k miles since I owned it. Swapped to Mobil 1, since then it's not burned any.
Edited by ManOpener on Monday 12th October 15:02
Check this thread
http://www.pistonheads.com/gassing/topic.asp?h=0&a...
where they vacuum the carbon out of the engine (after removing some inlet bits)
http://www.pistonheads.com/gassing/topic.asp?h=0&a...
where they vacuum the carbon out of the engine (after removing some inlet bits)
xjay1337 said:
hman said:
Words drawn from experience and not der internetz
NonsenseOr do you just think it would be a good idea?
Please feel free to post up before and after dyno plots as evidence of why we should clean our valves or GTFO
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