Cleaning the combustion chamber using water?

[aamirq]

bros i just read that the combustion chamber of a car can be cleaned using water! water in the sense as in spraying water into the throttle body while having the car constantly revved up at 2k rpm! and i read that it works i read abt it at alot of forums including cadillac ka forum!
what i read was that when u spray water into the TB it water turns into steam hence it cleans the combustion chamber and all the carbon comes out through the exhaust!

i would like senior members to comment on this pls...

[ahsanonline]

And did you also read that if done improperly it could result in a bad case of hydro-lock, even breaking some engine internals?

Its the age-old method of decarbonising an engine. Works a charm in diesel engines. Works good in old petrol engines too. IMHO not required for engines run mostly on CNG.

[aamirq]

yeh i read tht if u spray too much water it can cause a hydro lock and bend ur piston and other metallic parts! but i even read tht it works like a charm if done correctly!
but do modern engines require this?! arent fuel additives enuff?

[ahsanonline]

A well maintained engine wouldn't need it.

[suzukialtomehran]

@xulfiqar bhai your opinion is needed badly.

[SER_GTR]

You Have To Be Sure To Spray Controlled Amount of It Else Hydro Lock.....!!!

And Water Is In Form Of Mist......Mostly Water Injection Kits Used On High Boosted Engines Use Water Injection Kits To Lower Combustion Temp..

for All That Risk.....I Don't Think Combustion Chamber Need That Much Cleaning....!! Some Good Fuel Addictive Can Also Clean It Out For You

[ahsanonline]

Do not try this at home lol

I've also read that if piston heads have heavy deposits then one can always spray wd-40 on the pistons through spark-plug holes, leave it overnight, and then start next morning and rev it hard once warm. Dunno how effective that is ...so just don't try it at home! haha

[Teeboyuk]

It does work..only on strong big cc engines..don't try it on anything that's built in Pakistan ..you'll blow the head or engine..

[sami_voodoo]

A while ago, I have injected upto 10% of water in relation to air in a diesel engine for combustion studies (read up on water injection in WRC cars). There are a few things to consider however;
1. How do you know what's "a lot", or "too much" or "not enough" by just looking at a water stream?
2. Different size engines intake different quantities of air at a given engine speed. In general, a 1300cc engine at 2000 rpm no-load would be ingesting around 330 grams of air per minute.
3. To safely inject water without stalling or hydrolocking the engine, you need to inject 33 grams of water / min.
4. Water has to be atomised to a fine mist before injecting into the intake for it not to wet the cylinder walls.

In plain english, it'll be ill-advised to do so since the the difficulty far outweigh the advantages IMHO. As for the cleaning effects, yes they are real. With Ethanol-based fuels (E85 principally), the engines tend to remain carbon-free wherever the combustion takes place (combustion chamber, turbocharger turbine etc) due to a large quantity of water produced during combustion.