W9JAB 156 #1 Posted May 19, 2010 It's an old mechanics trick to use water to decarbonizes the combustion chamber, Carbon is a major factor in rings sticking and can scratch up the cylinder walls quite well when bits of it break of the piston head. It works by staring with a hot engine, turning the water into steam which then scours away the carbon, it does work on larger automotive engines with large strong pistons and cylinders. The problem is if you put a little too much in too fast in smaller engines the water will not get a chance to turn to steam and fills up in the combustion chamber then when the piston comes back up the water will not compress and it blows out the cylinder wall or breaks the connecting rod and that in turn will also punch out the block too, just don't get to western with the water spray and keep the rpm up. Share this post Link to post Share on other sites
jimbotelho 1 #2 Posted May 19, 2010 You are 100% right. I used to revthe motor up and spray a mist of water down the throat of the carb and then look at the tailpipe it was shooting all kinda of black smoke out) carbon breaking up) It worked >> :D Share this post Link to post Share on other sites
Duff 206 #3 Posted May 19, 2010 Probably a very dumb question on my part, but doesn't breaking the carbon up that way run the risk of scoring the cylinder walls? Duff :D Share this post Link to post Share on other sites
oldandred 15 #4 Posted May 19, 2010 Probably a very dumb question on my part, but doesn't breaking the carbon up that way run the risk of scoring the cylinder walls? Duff not unless its big carbon whats coming out is fine dust almost and out the ex, not though the intake Share this post Link to post Share on other sites
Duff 206 #5 Posted May 19, 2010 Ah ha! Thanks for the info! Duff :D Share this post Link to post Share on other sites
wallfish 17,587 #6 Posted May 19, 2010 This guy once told me that he would disconnect the windshield washer hose, then stick it in the carb and just push the button to "wash" the carbon out. Share this post Link to post Share on other sites
W9JAB 156 #7 Posted May 20, 2010 :D I had a laughf when the windshild washer was mentioned, Back in the day when I was young, crazy, and indestructible, we took nitro methane and put it in the windshield washer bottle, then ran the hose from that into the carb. If you had a descent R.P.M. up on the motor and gave the washer a shot Share this post Link to post Share on other sites
oldandred 15 #8 Posted May 20, 2010 I had a laughf when the windshild washer was mentioned, Back in the day when I was young, crazy, and indestructible, we took nitro methane and put it in the windshield washer bottle, then ran the hose from that into the carb. If you had a descent R.P.M. up on the motor and gave the washer a shot Share this post Link to post Share on other sites
