Cleaning carbon off intake valves on direct injection engines

[enigma-2]

As the title states, this is the method used by one person to clean his  intake & exhaust valves, in his direct injection engine. 

 

Gives the name of chemicals, tools and methods used. Claims it takes him 6 hours and does this at 120k km intervals.

 

Shows pictures of before and after.

(Super impressive results.)

 

Discusses use of catch cans and why he doesn't use them.

 

He talks about the use of catch cans & that they do work, but feels they're only 50% (maybe more) effective.

 

I'd guess 59% — 75% which extremely helpful, but still not perfect. Some stuff gets through and accumulates on the valve. Love to see a picture of valves with catch can after 50k miles. Just to see how effective the catch cans  really are. 

 

Anyway, I found this extremely interesting and thought I'd share.

 

 

 

 

Edited Monday at 08:35 AM by enigma-2

[1004ron]

Very good video and would be my preferred method when or if I decide its needed on my cars.

 

One thing that I believe could be contributing to the fouling of the intake valves is the Exhaust Gas Recirculation function that the Variable Valve Timing now performs, and that would apply to GDI and MPI.

 

After resisting the need for OCC (my negative opinion can be found in post a few years ago) I'm now 100% onboard with the need for them - any reduction in the oil contact with the inlet valves and in the combustion chamber is an advantage. 

 

I have 111K miles on my Sport and when I changed the spark plugs at 106K miles I inspected the intake valves and top of the pistons and they were remarkably clean, so not expecting to do this cleaning for quite some time - this may be due to the OCC, only using Costco Top Tier Gas and very gentle driving style.