Engine carbon cleaning

[jezvalva]

As this involves the engine I assumed this to be the right section. Has anyone had this done? I have a megane gt 150 mk2. The mpg is around 42 regardless of the type of diesel I use. Also Would I benefit from blanking my egr valve?

 

[White16valver]

Do you mean running some decarbonizing stuff through the system?

I have been recommended to try using a small amount of water to 'shock' carbon off by cooling it quickly against the hot engine, but I am scared of bending rods lol

 

[Rojer]

Well, my Dad had terraclean done on his van and said he noticed the difference, however as most cars use direct Injection it does little to clean valves and intakes. That's why you see people with Audi's and Bmws getting them walnut blasted. A good place to start would be checking the pipework and egr valve and clean it up, also if the intake is bad you can clean that. If it's really bad you can clean the valves yourself with the intake off etc.

 

[White16valver]

Well, my Dad had terraclean done on his van and said he noticed the difference, however as most cars use direct Injection it does little to clean valves and intakes. That's why you see people with Audi's and Bmws getting them walnut blasted. A good place to start would be checking the pipework and egr valve and clean it up, also if the intake is bad you can clean that. If it's really bad you can clean the valves yourself with the intake off etc.

Say what???

 

[neil a]

Say what???

Fairly common thing to have to do on direct injection engines , as the fuel does not wash the back of the inlet valves and with modern crank case re circ systems they carbon up real bad. Have to remove the inlet make sure the valve is fully closed and blast it with walnut shell/air, its a lot less aggressive than the likes of sand so does not score the valves.

Before

After

 

[White16valver]

Fairly common thing to have to do on direct injection engines , as the fuel does not wash the back of the inlet valves and with modern crank case re circ systems they carbon up real bad. Have to remove the inlet make sure the valve is fully closed and blast it with walnut shell/air, its a lot less aggressive than the likes of sand so does not score the valves.

I never knew that, that is the one new thing I've learnt today!

I'm guessing one has to make sure all the stuff is sucked out again lol

 

[Robbie Corbett]

I never knew that, that is the one new thing I've learnt today!

I'm guessing one has to make sure all the stuff is sucked out again lol

Their machines suck most of it out but walnut is not abrasive like sand so 'apparently' does no harm to the engine.

 

[Jack!]

What a waste of walnut.

Think of all the coffee cakes that died for this.

 

[bloke]

What a waste of walnut.

Think of all the coffee cakes that died for this.

it's the shell.

 

[Kev@KAM]

it's the shell.

you dont eat that bit? You weirdo!

 

[bloke]

you dont eat that bit? You weirdo!

It hurts when you poop it out ?