RE: Too much oil.
Test results using different % of oil:
After all your good inputs in this topic, I have made some tests with my new Super Tigre GS 45 engine (has been running 5 liter / 1 1/3 gallon fuel). I thought a certain oil % was to keep the engine well lubricated. During the test I discovered, that the HP also increase/decrease when you chances the oil %, and the whole running attitude also chances.
I used 0 nitro, 3 % castor, Aerosynth2, APC 11/5 prop, stock muffler and Rossi 3 and 4 plugs. The engine was broken-in, and was in fine condition. I tested it on my test bench, where I could measure the kilograms it pulled + taco, and there bye calculate the horsepower.
Oil – Plug – RPM – HP – Comments
12 % (3/9) - Rossi 3 – 10500 - 1,40 - Unstable full-speed, rich middle range, and good idle. No flip-start.
15 % (3/12) – Rossi 3 – 10500 – 1,45 – Ok full-speed but tricky to adjust, ok middle range, and good idle. No flip-start.
18 % (3/15) – Rossi 4 – 10500 – 1,52 – Perfect running. Easy flip-start.
22 % (3/19) – Rossi 4 – 10500 – 1,50 – Perfect running. Easy flip-start.
25% (3/22) – Rossi 4 – 10500 – 1,49 – Perfect running. Easy flip-start.
The mixture was set to just increase a little when I pinched the tube. Damn, the mixture has to been set MUCH richer, when the oil % increases! No increase in RPM with less oil, as I thought, and awful running with 12 % oil. I haven’t tried chancing the compression, and it will to expensive to get Cooper-oil to Denmark (the oil XJet is using)
Pe Reivers: Congratulation with your football-team at the Euro2008 [8D]