Re: Carbon Buildup
I couldn't disagree more with ODDD1 or Hadley. First OMC's Engine Tuner tells you right on the can to leave it sit for 12 hrs. It used to be 30 mins then 4hr but now they've changed the formula again and recommend 12hr. Seafoam is the best and the fastest(5-15minutes). NAPA and CarQuest carry's it. I've seen 100's of 2 stroke engines seize up from carbon. What happens is the ring lands(grooves) pack up with carbon. When this happenes they can't disapate heat, they swell up and grab the cylinder walls. It either siezes the engine or the rings break and the piston trips over the rings destroying the combustion chamber.<br /><br /> I have several Evinrudes from the late 40's. A 22.5hp Speeditwin and a 50hp Big Four. They were made to run on 16 to 1 mix of straight 40wt motor oil. You want to talk about carbon, you aint seen nothing like the carbon that was in those engines when I bought them. Both were in the 80lb range for compression. Once I got them running one treatment with Seafom removed the carbon and both have compression in the 130-140lb range, so saying a decarbon won't bring them back is wrong. I've run both of these engine over 200hr since without problem. I use Seafoam in them every 25-30 hrs even with OMC TCW3 oil. I've run OMC V4's and V6's to 2500-3000hr without problems because I treat them every 50 hrs with a decarb. All two stroke engines need to be decarboned.<br /><br /> Seafoam is nothing but a mineral sprit concoction that soaks into and allows the carbon to be burned out of the combustion chamber. The smoke you'll see after you restart the engine will prove this to you. Deep Creep is the same stuff in a spray can. This stuff has been around for over 50 years and learned about it from the old outboard guys.<br /><br /> You spray it down the carb throats while the engine is idling. Once you have 10-12oz sprayed in you drop back the idle spray hard enough to drown/choke out the engine with the stuff and stall it. Let sit for 15 minute and restart the engine. You won't believe the smoke.<br /><br /> The problem is not with the oils you are burning it's all the additives in the fuels that the outboard maunf's have been chasing with their new oils. OMC, Merc and Yam oil contain twice the carbon inhibitors as the cheaper oils(Wally World, Texaco, etc.)
I couldn't disagree more with ODDD1 or Hadley. First OMC's Engine Tuner tells you right on the can to leave it sit for 12 hrs. It used to be 30 mins then 4hr but now they've changed the formula again and recommend 12hr. Seafoam is the best and the fastest(5-15minutes). NAPA and CarQuest carry's it. I've seen 100's of 2 stroke engines seize up from carbon. What happens is the ring lands(grooves) pack up with carbon. When this happenes they can't disapate heat, they swell up and grab the cylinder walls. It either siezes the engine or the rings break and the piston trips over the rings destroying the combustion chamber.<br /><br /> I have several Evinrudes from the late 40's. A 22.5hp Speeditwin and a 50hp Big Four. They were made to run on 16 to 1 mix of straight 40wt motor oil. You want to talk about carbon, you aint seen nothing like the carbon that was in those engines when I bought them. Both were in the 80lb range for compression. Once I got them running one treatment with Seafom removed the carbon and both have compression in the 130-140lb range, so saying a decarbon won't bring them back is wrong. I've run both of these engine over 200hr since without problem. I use Seafoam in them every 25-30 hrs even with OMC TCW3 oil. I've run OMC V4's and V6's to 2500-3000hr without problems because I treat them every 50 hrs with a decarb. All two stroke engines need to be decarboned.<br /><br /> Seafoam is nothing but a mineral sprit concoction that soaks into and allows the carbon to be burned out of the combustion chamber. The smoke you'll see after you restart the engine will prove this to you. Deep Creep is the same stuff in a spray can. This stuff has been around for over 50 years and learned about it from the old outboard guys.<br /><br /> You spray it down the carb throats while the engine is idling. Once you have 10-12oz sprayed in you drop back the idle spray hard enough to drown/choke out the engine with the stuff and stall it. Let sit for 15 minute and restart the engine. You won't believe the smoke.<br /><br /> The problem is not with the oils you are burning it's all the additives in the fuels that the outboard maunf's have been chasing with their new oils. OMC, Merc and Yam oil contain twice the carbon inhibitors as the cheaper oils(Wally World, Texaco, etc.)
