Pinecone Posted February 14 Report Posted February 14 18 hours ago, PeteMc said: Because my mind always goes down into the weeds... So how much water would get into the oil through the cylinders from the minimal amount of water sprayed through the injectors? And how long would it take to boil off once the engine was started and gets to temp? Would it be much more or less than a plane in the spring or fall that sits for a say a week as the temps go up and down over a pretty broad range and there is a fair amount of condensation in the engine every day? I'm not disputing if the oil should be changed (or not), I had just never heard of major water getting into the oil because of water in the tanks. I certainly would not have thought it was enough to matter. When I first got my plane and I hadn't flown in a while I used to take off the oil cap to let the moisture out when I got to our lunch or whatever destination, and I'd fold over the cowling door (not locked) just to keep debris from getting in there. One day an afternoon T-Strom passed through and I got back to the plane with the door blown open and I assumed a tone of rain went into the oil. Called my mechanic who had a good laugh and said I could poor more water in there than rain would go in the filler and it would boil off before it would matter. Granted, we were talking about starting up the engine and flying back an hour or so, not letting it sit with the water in there. IIRC they tried to start it multiple times. So a lot more water pumped into the engine than any conceivable amount of condensation. There just isn't a lot of volume in the crank case. Quote
Shadrach Posted February 14 Report Posted February 14 On 2/12/2024 at 2:47 AM, Ibra said: Does anyone know how to start Mooney (for ground run) if they suspect water in the tanks? I was helping a fellow Mooniac this weekend, we sampled the main tanks and the gascalator and found lot of water in tanks: allmost 1/8 of a gallon ! Aircraft did not start after load of attemps, even on auxiliary power...it's finally, in hangar now and we are giving it a go in two weeks (we did drain all fuel and we plan to refuel it again with pre-heat next time) We are not planning to fly it anytime soon until everything is checked, sadly, that beauty has been sitting for a while under rain and dirt, way too much this year and has too much gremlins... What model Mooney? Both tanks or just one? An 1/8th of a gallon is a lot of water, for 64gal tanks and up, that should not be enough to displace the unusable fuel and enter the fuel lines. Perhaps there is something else causing the problem? Quote
Ibra Posted February 14 Report Posted February 14 4 hours ago, Shadrach said: What model Mooney? Both tanks or just one? An 1/8th of a gallon is a lot of water, for 64gal tanks and up, that should not be enough to displace the unusable fuel and enter the fuel lines. Perhaps there is something else causing the problem? It’s 77 M20J, I was puzzled as well it’s a lot of water, however, it was sitting outside for 8 months and only did 2h, it’s now in a hangar, the owner managed to start and do ground run yesterday, he will investigate with his mechanic Shame it’s not flying that much… Quote
Shadrach Posted February 16 Report Posted February 16 On 2/14/2024 at 3:58 PM, Ibra said: It’s 77 M20J, I was puzzled as well it’s a lot of water, however, it was sitting outside for 8 months and only did 2h, it’s now in a hangar, the owner managed to start and do ground run yesterday, he will investigate with his mechanic Shame it’s not flying that much… All it takes is a leaky fuel cap. I’ve never been to Rouen, but given its location, I’m assuming that the last several months have been rainy. He M20J has 1.28 gals of unusable fuel per tank. In order to ingest water into the fuel system, with the airplane stationary on the ground, the water content would have to exceed unusable fuel. So, if you drained 1/8th of a gallon from a tank, that means that quite a bit was pumped through the fuel system. 1 Quote
PT20J Posted February 17 Report Posted February 17 On 2/11/2024 at 7:34 AM, PT20J said: I usually just prime and crank. I have tried waiting a bit and haven’t noticed a reproducible difference. I am going to try Rich’s method though. I have used it for hot starts and it seems to avoid the problem of the engine wanting to die when it uses up the gas remaining in the lines. But, I’ve never tried it on a really cold engine. I tried it today on my IO-360. The airplane has not been flown for 5 days. It was 40 deg F at an airport elevation of 120 feet. I set mixture rich, throttle open about 1/4", boost pump off, no prime. I cranked about 10 seconds and it didn't start. I primed and set mixture to ICO and it fired right away. 2 Quote
Ragsf15e Posted February 17 Report Posted February 17 1 hour ago, PT20J said: I tried it today on my IO-360. The airplane has not been flown for 5 days. It was 40 deg F at an airport elevation of 120 feet. I set mixture rich, throttle open about 1/4", boost pump off, no prime. I cranked about 10 seconds and it didn't start. I primed and set mixture to ICO and it fired right away. Could be his warm Arizona weather. I would have primed, waited 20” then cranked for those conditions. 1 Quote
N201MKTurbo Posted February 17 Report Posted February 17 4 minutes ago, Ragsf15e said: Could be his warm Arizona weather. I would have primed, waited 20” then cranked for those conditions. Man, trash talking me and don’t even reference me… 4 Quote
slowflyin Posted February 17 Report Posted February 17 On 2/10/2024 at 10:03 PM, MikeOH said: Hmm, interesting discussion. I typically wait 10 to 15 seconds after prime before cranking; fires after a blade or two. If I crank immediately after prime, I have to crank for several seconds. Take that for what it's worth. My experience as well. Quote
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