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Re: Carbon Cleaning
[Re: venice]
#1043879
5th Sep 2017 1:07am
5th Sep 2017 1:07am
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Joined: Jul 2008
Posts: 14,117 Birkenhead
diggingdeeper

Wiki Master
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Wiki Master
Joined: Jul 2008
Posts: 14,117
Birkenhead
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This process is supplying free oxygen into the engine which causes the burn to be hotter, not only does it oxidise the carbon, it will probably oxidise some metal as well. What is also not good is that the burn will occur faster, contrary to popular belief, the fuel does not explode in an engine, it is a controlled burn over a period of time, explosions damage the engine as do fast burns (eg pinking for petrol or diesel rattle).
The general rule for most engineering is do not fix what isn't broke, processes like these are more about making money than providing a necessary service. If it was necessary the car manufacturers would be cashing in on this, not a load of free-lancers. (which reminds me, I saw someone having their house roof jet-washed the other day, something that has very little use but can introduce a lot of problems)
The carbon doesn't build up with time unless the engine is running cold (caused by either running fuel rich or short journeys all the time) or you are burning an excessive amount of oil. Admittedly on some diesel designs there can be a slight build up in places but with proper additives that are already in decent fuels (not so much in supermarket fuels) and a good motorway run they are generally kept to acceptable levels.
There really is no need, my fifteen year old diesel has done 180,000+ miles, I always use shell diesel and occasionally splash out for a tank full of their premium fuel (about once a year) and make sure it has a good run regularly, especially if I've been doing a few short journeys.
A diesel engine will always have some carbon, removing it is pointless as it will come back pretty quick but it should not build up excessively. Diesel is more of an oil not more of a spirit like petrol. Also on a diesel the fuel to air ratio isn't regulated as much as it is on a petrol engine.
In past days some carbon build up was good for engines and that was part of the running-in process but with more modern engines the engineering is more precise and the carbon is no longer needed.
We don't do charity in Germany, We pay taxes. Charity is a failure of governments' responsibilities - Henning Wehn
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Re: Carbon Cleaning
[Re: venice]
#1043989
6th Sep 2017 6:19pm
6th Sep 2017 6:19pm
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Joined: Dec 2003
Posts: 5,683 Bebington, Wirral
DavidB
Wiki Guide
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Wiki Guide
Joined: Dec 2003
Posts: 5,683
Bebington, Wirral
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Water injection is used to keep intake temperature lower, and it also stops/removes carbon deposits.
You can spray a tiny amount of water into the intake (a drop each time the engine lowers rpm - not enough to hydro-lock the cylinder), it does a good job and it's free.
"C20 LET bang"
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Re: Carbon Cleaning
[Re: venice]
#1043990
6th Sep 2017 6:20pm
6th Sep 2017 6:20pm
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Joined: Dec 2003
Posts: 5,683 Bebington, Wirral
DavidB
Wiki Guide
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Wiki Guide
Joined: Dec 2003
Posts: 5,683
Bebington, Wirral
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Actually, I checked how they do it - spraying water vapour into the intake. Same thing lol. I wouldn't say it was a waste of time ... it does work. They have a picture of machine, I wonder what that does? piccy
"C20 LET bang"
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