Sorry ;
No one replied so I thought it wasn't important .
Be aware that this isn't what I'd do to a Mercedes 20:1 Compression Ratio engine .
Anyways : operate engine until it's fully warmed up to operating temperature , remove the air cleaner and take a spray bottle full of water , set it to the 'fine mist ' spray , rev. the engine to 3,000 RPM and , whilst holding the throttle , begin gently spraying in a fine mist of the clean water ~ you'll hear the engine miss and see large clouds of black or grey smoke emit from the exhaust , DO NOT release the throttle but *do* stop spraying if the engine drops a lot of RPM , it'll clear out and climb back to to 3 K RPM in a moment .
What happens is : the fine mist of water hits the red hot carbon and *instantly* flashes into steam , blowing the accumulated carbon off the piston crown and combustion chamber (spark plugs too) so it can go whistling out the exhaust , you'll see red hot glowing sparks sometimes .
This is why , when you take apart an engine that blew a head gasket or cracked a cylinder head , one or more cylinders will be suspiciously clean ~ the leaked in coolant blew out the normal carbon as the engine died .
Water , even in fine mist , isn't compressible so inducing it into a high compression engine , can crack the pistons or bend the connecting rods .
The older Garage mechanics who weren't well trained , would simply up end a 6 oz. Coke bottle of water down the open intake whist Granny's Oldslowmobile was wailing along in protest with the throttle pinned ~ folks over 50 may remember the clouds of smoke belching from the back end of a '55 Caddy in the Service Bay of the local Sinclair Station , if the Mechanic was lucky , the car suffered no damage and ran *MUCH* better for another year or two .
If too much water went in and the engine hydro - locked , he simply told them it was time for a rebuilt engine....
I prefer the " Italian Tune Up " on my old Mercedes because it works the same and I like to think I keep my cars in sufficiently good repair that a 100 + MPH run @ 0-Dark:30 is safer .
If you're the gambling typ , a -tiny- mist in your Mercedes might work the same way .
YMMV , AFAIK , other excuses go here .
-Nate
Alan wrote:
>
> On Jan 16, 2012, at 6:29 AM, Nate wrote:
> > I recently de coked an incredibly oil fouled engine using an old method learned from a Journeyman Mechanic working on a 1952 Oldslowmobile Rocket 88 that Granny had nearly ruined by never exceeding 25 MPH ~ I've tweaked the methodology a little bit but it still works a treat .
>
> Well don't keep us hanging..... How?!?!?!?!?!..... 8-)
>
> - Alan
>
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