The engine is not fixed, the engine is just running pretty well. Big difference. When I opened it I couldn't find anything wrong with it other then some rust. Quite a bit of rust but it still doesn't answer the question, why no compression?? Today was run in day and Gene's engine fired right up and it only took a few seconds to tune it up, very touchy on the high end but it does have a sweet spot. I never touched the low end. My thinking is the ring is just going to take a lot of time to get it to seat. I ran it in 10 ounce runs with a cool down between each run. There still wasn't any compression either right after shut down or after cool down?? Last thing I did was check to make sure the valves were seating and they were both just fine. Other then ring seating there is no reason for this engine to not have compression but it doesn't?? You can roll it over by hand and there is none of that nice kerthunk when you flip it over. Only prop I had for it was a MAS 12X6 and first run was around 9500 max and the last run was just a taste over 10 grand. I didn't fool with the low end but it would go down to 2500 and putt along then I could crack it open without any stumbling at all. It would go lower but I took no readings lower then that. I think it just needs some air time to get the ring to seat.
I sent one of my OS 1.20s to an RCU friend and got it back from him yesterday so I test ran that too. I didn't do anything at all for Gene that anyone else could have done but this fellow, I won't mention Dons name though, not only made me a complete new pump of his own design but then took apart my old pump and designed and made a new diaphragm for it. This was in answer to the way OS/GP makes things so we can't rebuild them ourselves. It was leaking fuel and flooding too, not just a little, but I had gotten a bad set of bearings when I rebuilt it from BOCA. I said the bearings were the wrong size but Boca stated these were the correct size, bearings should not just slip into the case!! But according to Boca these were they way they should be. Anyway, Don installed new bearings and fixed the unfixable pump and that old dog is running like new and not leaking the fuel out the front bearing. A perfect job by another RCU member.
Don is going to or has already posted up a how to on rebuilding these closed and sealed pumps here on RCU for the rest of you. He was just waiting to see how I felt about his rebuild, NICE!!
I thank you Gene but I still can't figure out why it doesn't have the compression but it is running well.
Other Gene