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Author Topic:   cleaning piston trick?
rogracer2
Dirt Maniac

Total posts: 119
posted August 16, 2004 08:15 PM  
My motor seems to be lacking in power recently, and someone told me it could be carbon on the pistons. He said I should get the motor hot (at least 270 degrees), and pour some water into the carb. This would cause carbon on the tops of the pistons to crystalize. Then he said to pull the plugs one at a time, and watch the black crystals come out when I turn the motor over a few times. Anyone heard of this trick before? Any success stories out there? Is there anything to worry about in this "experiment"?

joetaylor
Dirt Forum Champ
Total posts: 640
posted August 16, 2004 08:43 PM  
used to do this on an old oilburner 350 w/ 200,000 miles in a plow truck it worked but the temp you mentioned is a little high I did it 2 180 normal operating temp and I would only drisel the water in and no more than 20. oz but I shuld take you about 30 min to drisel it in that is about how SLOW and no faster but this a redneck way .

correct way it to get GM top engine cleaner found @ your local gm dealer for about 10.00 and virtually no chance of dammage

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if every thing is under control your not fast enough

M1
Dirt Freak

Total posts: 257
posted August 16, 2004 09:19 PM  
rev her up to about 2,000rpm and slowly pour some tranny fluid in it. I know there is alot of detergent in tranny fluid, and I have no idea if this really does work, but it sure makes alot of cool smoke!

I did this once on an old car that was grandma driven, and it seamed to help. Either way, it was cool to smoke out thw neighborhood. LOL

iowatoolman
Dirt Freak

Total posts: 369
posted August 16, 2004 09:19 PM  
it is something i would not do

use some seafoam you can add it to the gas
if it is all carboned up you might want to go down in jet sizes

77k
Dirt Maniac

Total posts: 174
posted August 17, 2004 12:51 AM  
We pour trans fluid down the carb if we get hot,it helps the engine.

racerguy500
Dirt Maniac

Total posts: 168
posted August 17, 2004 01:16 AM  
I have heard of that in a high mileage worn out street engine but I would be worried about particles dislodging and getting between the piston and cylinder and creating alot more damage if it were me. If you have that much carbon on top of a race engine you got something else you should be worried about. I would check compression, timing, valves and all that stuff. Even do a leak down test if you can. My guess would be either something changed or it is just getting tired. In either case removing carbon isn't gonna help anything.

waltonjr1
Dirt Forum Champ
Total posts: 516
posted August 17, 2004 02:44 PM  
When I use to run karts we would run it super fat to build carbon, made the piston stick out the hole a little further. LOL


copper
Dirt Full Roller

Total posts: 51
posted August 26, 2004 09:01 PM  
THE BEST THING TO CLEAN AN ENGINE WITH IS SEA FOAM. WARM ENGINE TO OPERATING TEMP AND REV ENGINE UP AND POUR ABOUT A HALF A CAN INTO CARB MAKING SURE YOU GET IT IN BOTH SIDES OF THE ENGINE UNTIL YOU DROWN THE ENGINE SO IT DIES. LET IT SIT FOR ABOUT 20 MINUTES AND THEN RUN IT HARD FOR ABOUT 5 MINUTES AT LEAST, IF YOU CANNOT DRIVE IT DOWN A ROAD. I USUALLY USE IT ON STREET CARS AND YOU DRIVE THEM ABOUT 10 MILES AT ABOUT 70MPH CLEANS ENGINES GOOD. ON FUEL INJECTION MOTORS FEED IT INTO THE BRAKE VACCUAM LINE. HOPE THIS HELPS SOMEBODY OUT THERE.

iowatoolman
Dirt Freak

Total posts: 369
posted August 28, 2004 12:12 AM  
BE CAREFUL DROWNING THE MOTOR
you can hydrolock the motor and break pistons or bend rods

i have always put it in slow as not to drown the motor but enough to make sure it is running really rich (with sea foam)
so that it cleans as it burns

drive hard or drive home

mavrik82
Dirt Forum Racer

Total posts: 93
posted September 03, 2004 03:40 AM  
The water does cause the crystallized carbon to fracture, but it can also crack a hot exhast valve.

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