I've been told by someone that you can remove or reduce the amount of built up carbon in the cylinder by spraying a fine mist of water into the engine while it's running.

I'm curious to know.

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This is true, water injection has been around for years. Since I was a young 'un.
If you have a blown head gasket and water leaking in, or a crack in the head, that cylinder will have little or no carbon in the chamber.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

So is it something you should do or not do?

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Flute - 68 MK I Cooper S
Member: VMCI #2474
Member: International Mini Model Collectors Club

I would wonder how long would you need to apply water mist to the inlet to get a result?

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

I have also done this many times over the years using a spray bottle, it is amazing how well it works.

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Have a Nice Day.
If already having a nice day please disregard.

Works well enough to notice a difference in how the engine runs? or just how clean it becomes?

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It does get rid of all the carbon & crap caught around the valves in the chamber & on top of the piston so i does bring a tied engine back to life for a little while & it can stop engine "run on" in old oil burners. Its more well known for its cooling & anti knock properies in Turbo engines.

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Have a Nice Day.
If already having a nice day please disregard.

yep how do you know the carbon is gone and is it just done on idle

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Stop Licking the Dog...I Don't Care Who Started It

Run the engine at 2500 - 3000 rpm and spray a mist of water into the carb mouth. It'll belch steam and black soot for a while, when this stops you've cleaned most of the crap out

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Simon

The adventures of an owner builder in the Tallarook Ranges

Yeah i think i remember warrick Augustin saying this one time.

But by memory too much and you will brake your motor.

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I am definitely trying this when I get home.

Didn't Spitfires have water injection in their V12 Merlins?

I have tried this too on an old Bluebird that was pinging its ring off. The carbon deposits in the cylinder get hot and cause pre ignition. Worked well, did another 20k with no issues.

It does work. Remember that you want a fine spray, a mist entering the carby intake while the engine is running at normal temperature.

Pouring water into the intake = bad

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Too many cars, and too little time.

Its basically just like steam cleaning.

Great to stop pinging on forced induction engines.

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"Not Speeding Officer..........Qualifying"

isn't that because it's cooling the piston and combustion chamber, rather than removing carbon deposits?

I'd do it on a motor I didn't care about, on a motor I cared about I'd just take the head off.... I don't like the idea of chunks of hard stuff bashing about in my cylinders

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did I tell you that I won a trophy?