sowega flyer
Posts: 309
Joined: 8/1/2006 From: Pelham,
GA, USA Status: offline
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quote:
ORIGINAL: sowega flyer I got my 2300 on the bench yesterday for its intitial break in, and did all the peliminary things to get it broken in correctly. By the end of a gallon of fuel, I started to fine tune it and put an 18x6 MA wooden prop on it. I have gotten the idle down to a consistant 1900, (can idle @ 1820, but I didn't feel comfortable that low) timed 30 seconds then slam to WOT and it revs right up, without any hestitation. I am only getting 7740 max RPM with this prop combo (that is peak RPM before richening the high speed 300 rpm lower) That seems very low, even though I know the engine will gain power as it is run in, but that is a recommended prop according to the Tower Hobbies tech notes. I will prop it down a little for the flight break-in. While doing the break-in, I noticed an air leak around the o-ring @ the carb. I put a better o-ring on it and sealed it with high-temp RTV gasket maker. I also took the flimsy o-ring off of the muffler and sealed it with the RTV as well. I do notice a little fuel leak at the high speed needle, but I haven't messed with that yet. I think it seems worthy to mention that I used 10% Omega for the break-in. Should I be trying to get the RPM's up higher than what I am seeing? Would 5% nitro be a better fuel for this engine? UPDATE: I have run this engine some more, and changed props to a MA 16x10. The max RPM with that prop is 8220. I also tried a 16x8 with the same reading. I then switched fuel to 5% nitro with no change in max RPM. The problem I am experiencing is at the carb. It went from a little leak at the high speed needle to a big leak. The high speed adjustment is almost unresponsive. (at least 2 whole turns on the high speed needle to richen it up 200 rpm) The question now is how do I seal the o-ring to make it effective, and quit leaking, or do I buy an after market carb? There is an old saying: You can polish a turd, but in the end, its still a turd. Has anybody tried the Jett carb on this engine?
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