rcrobby,
You can refer to your engine manual for more detail, but maybe Ican briefly answer your questions here.
1. We discuss flying your model for break-in, but many have decided to break-in the engine on the ground. On the heating cycle, make sure the engine gets above 170°F and stays below 330°F. I would suggest pulling the engine back into a cooling cycle around 250°F while on the ground. The exact length of time that you run it at full throttle doesn't matter too much, but make sure that the engine gets above 170 and that's when it is "loosened" up. It may only be 30 seconds, but do this for the first tank of fuel at least.
2. In the manual we suggest using a synthetic, but our wording may have confused some people. Use a high-quality oil, whichever you choose (conventional or synthetic) and be sure to mix it at the recommended 20:1 ratio.
3. We have posted previously an RPM chart for different prop sizes that we have tested. This should only be used as a guideline, not a minimum. Rather than hunting for a number, Iwould suggest reading the manual section on tuning the high speed needle and just be sure that the engine is tuned properly for break-in. What's important here isn't limiting the RPM, but rather making sure the engine gets to operating temperature during break-in so that the piston and liner can grow into a proper fit.
Thanks,
Jimmy
ORIGINAL: rcrobby82
Pete,
Since we are on the subject of breaking in I have a few questions;
1: what temprature should we be looking for and what time duration should we hold this temp for heat cycles while breaking in? (ex. 120f for 5 mins for 10 cycles)
2. Do you feel it is better to run a NON synthetic oil at first? how long would you reccomend before switching to Synthetic?
3. Do you reccomend any RPM limits for specific sizes during break-in?