jmendoza
Petty Officer 1st Class
- Joined
- Jun 9, 2008
- Messages
- 314
I did the treatment to my outboard engine this weekend. The engine block is a replacement I got off eBay and swapped it out last fall for the original one. I felt the replacement block was not quite as fast as the original one I took off, but it did start easier and run smoother. I had taken off the head and cleaned it and the piston crowns of carbon and then bolted the head on with a new gasket prior to installing it on the outboard. At any rate, I felt the rings might be slightly stuck as this engine had been sitting for a long time and was probably last used back in the later 1970s when they had nothing but petroleum based oils being sold for outboards. I had not done a compression test, but the engine seemed no harder to pull with the rope starter than the old engine.
I warmed up the engine and did the treatment, then took the boat out with my boys. Initially, I did not notice much because you have to motor slowly out of the marina and bay past the 5 mile an hour limit bouys. Then we got out in the open area of the lake and it was quite choppy due to many boats and the 15 mph breeze. I was not running wide open to keep the boat from pounding in the chop as we went through it, but once we got close to the dam end of the lake where the water smoothed out I opened up the throttle and the boat went faster than it ever has before, wow! While fishing, I had the engine tilted out of the water and took the top cowl/engine cover off to turn the big flywheel by hand, just to check the compression. It felt like it definitely had more resistance as the pistons came to the top while I slowly rotated the flywheel with the palm of my hand. Suddenly, while slowly rotating it, the engine fired! I hit the kill button quickly but was impressed as it started when being turned over so slowly, just another indication of the effectiveness of the Valv Tect treatment.
Incidentally, I do not spray the entire contents of the can through the engine while running. Instead, I get the engine hot, pull the plugs, and spray it directly into the cylinder with the piston at TDC, and the engine on tilt to get the cylinders as vertical as possible. Let soak for 15 minutes and repead for 2nd cylinder, then replace plugs and run at fast idle for 15 minutes and follow up with a good 1/2 hour run on the lake. The benefits are you get more concentrated chemical directly on the piston and rings for a more thorough cleaning, you use far less of the de-carb sauce, and can do repeated treatments as required. This tip was at the very bottom of the instructions for the original cans of OMC engine tuner, and I found it worked much better than wasting a whole can on an engine. Hence the dramatic improvement was noticed.
I warmed up the engine and did the treatment, then took the boat out with my boys. Initially, I did not notice much because you have to motor slowly out of the marina and bay past the 5 mile an hour limit bouys. Then we got out in the open area of the lake and it was quite choppy due to many boats and the 15 mph breeze. I was not running wide open to keep the boat from pounding in the chop as we went through it, but once we got close to the dam end of the lake where the water smoothed out I opened up the throttle and the boat went faster than it ever has before, wow! While fishing, I had the engine tilted out of the water and took the top cowl/engine cover off to turn the big flywheel by hand, just to check the compression. It felt like it definitely had more resistance as the pistons came to the top while I slowly rotated the flywheel with the palm of my hand. Suddenly, while slowly rotating it, the engine fired! I hit the kill button quickly but was impressed as it started when being turned over so slowly, just another indication of the effectiveness of the Valv Tect treatment.
Incidentally, I do not spray the entire contents of the can through the engine while running. Instead, I get the engine hot, pull the plugs, and spray it directly into the cylinder with the piston at TDC, and the engine on tilt to get the cylinders as vertical as possible. Let soak for 15 minutes and repead for 2nd cylinder, then replace plugs and run at fast idle for 15 minutes and follow up with a good 1/2 hour run on the lake. The benefits are you get more concentrated chemical directly on the piston and rings for a more thorough cleaning, you use far less of the de-carb sauce, and can do repeated treatments as required. This tip was at the very bottom of the instructions for the original cans of OMC engine tuner, and I found it worked much better than wasting a whole can on an engine. Hence the dramatic improvement was noticed.
