Carbon build up in GDI engines

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Carbon build up in GDI engines

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As some of you may know, and especially as my Ibiza is a Direct Injection design, one of my ongoing interests is in how the problem of carbon build up in the inlet tracts and valves is being addressed both, at source, by vehicle manufacturers and after market solutions to the problem.

I've been running the Ibiza with a small concentration of Archoil AR 6900-P Max since almost new in the hope that it will delay the build up. This product contains PEA which is supposed to help in this respect:
https://www.powerenhancer.co.uk/archoil-ar6900-p-max-advanced-petrol-synthesis.html
There are other products which contain PEA which can be sprayed into the inlet system to achieve a partial cleaning:
https://www.youtube.com/watch?v=RcVDZAauO88&vl=en
However I'm too much of a perfectionist to be happy with a partial cleaning and it looks like you've got to carry out the process quite frequently for maximum effect. What bothers me most of all though is that it's "dissolving/loosening" all the carbon and passing it through the engine, turbo (if you have one - turbo blades are fragile) and Cat/particulate filter (remember very new Petrol engines have particulate filters now). I'd rather just not risk this.

So, for some time now I've been thinking - as I have my nice new big compressor (y) - that walnut blasting would be the way to go:
https://www.youtube.com/watch?v=cDbh8C1AGW4
I'd have to buy some additional kit and walnut blasting media but for half what I paid for the compressor I could buy a nice setup or maybe take a risk on one of the cheap "hopper" type - I do have an old gas cylinder which I could modify perhaps? Having looked at a number of you tube videos and being aware that the BMW indy near me uses walnut blasting I'd pretty much decided it was Walnut blasting for me! Until I saw this:
https://www.youtube.com/watch?v=Kn6NVHLy-Xc
He's using the CRC product sprayed directly into the ports - with the relevant valves closed so no access to the cylinder being worked on - where he lets it lie to soften/dissolve the carbon before sucking it out and cleaning up with some rags.

Until now I haven't found anything which quickly and easily dissolves baked on carbon but this seems to do the job beautifully doesn't it? No extra capitol equipment to be bought and used maybe only once or twice? Looks like a bit of a no brainer doesn't it? What do you think folks?
 
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