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0| mferraz
rrNovice Houston, TX |
Header Tank Headache I hope this is the right pleace to post this, but it's really not specific to any one heli, but more about fuel systems in general. Ok, here goes...So, I have a 700N, with a YS91sr. I've been in fuel system hell for almost 3 weeks now. I have changed the main tank, added a header tank, changed all the fuel lines, the check valve, and the T-Filter. I can leak test with a full fill up, even cap off my preassure release towards the end of the fill, and no leaks. Ok, so get this...When I'm in flight, and ONLY when in flight, my header tank slowly starts to empty. Not as fast as if it were doing so at the end of the flight, and before the main tank is anywhere close to empty. Within the first few minutes of flight. Main tank fine/full, header tank half empty.Gets even weirder. The header tank stays half full and doesn't empty. Now the engine starts running super lean under throttle. I sit her down, and notice a few bubbles in the short fuel line that goes from the fuel regulator to the carb on the engine. I've heard these bubbles are nothing to worry about, but there seems to be lots of differeing opinions on ths, so I'm not really sure what to think.The most difficult probelm about all this is, I can't reproduce it on the bench, only in flight. And a 700N isn't really something you can just fly anywhere, so I have to try something, take it to the field, test it, take it home. Everytime I do something more I and leak test, I feel like it should be good on the next flight, but do dice. That header tank keeps on starting to empty early in the flight.So, I'm thinking maybe it's an engine issue, or something else I'm not thinking of. Before I added a header tank, I was using a fuel magnet, but it started to go bad and jack with my tuning, so I decided to try the header tank, since I have them on all my birds and am used to flying with them.I'm not sure if I was having this problem with the fuel magnet or not, but if I was it was pretty covered up I guess. If I run direct from the main tank, it starts to lean as well.I'm really at my wits end here, and love my YS, but this is really driving me crazy.If anyone has had this problem, or might have any ideas about what could be causing it, or how to fix it, I would really be most appriciative. Thanks for your time... |
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| GimbalFan (RIP)
rrProfessor Big Coppitt Key, FL |
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| mferraz
rrNovice Houston, TX |
Yup I have checked the clunk lengths everywhere, and change both clunks multiple times. I even tried a few K&S header tanks, which much have been from a bad lot or something, becuase they both leaked. I'm on my second thunder tiger tank at the moment... |
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| jesus1895
rrApprentice Tucson AZ |
remove just the header tank And the magnet........ and try that.its easy and quick.....can be done at the field,See if that helps. |
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| GimbalFan (RIP)
rrProfessor Big Coppitt Key, FL |
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| jbiter
rrKey Veteran Sebring, FL |
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| mferraz
rrNovice Houston, TX |
Vibration Question Yes, but only in the main tank. The crankcase pressure coming off the backplate of the engine really seems to stir up the main tank fuel. I can't remember for sure if that has always happened, or not. I've been dealing with this issue for a while now and it's hard to remember for sure when I changed what or if it did something at a specific point, but I'm trying my best. I don't specifically remember the fuel being that stirred up in the main tank before, but I really doubt I was paying that much attention to it, really. Alomst like there is a white blur in the main tank during flight, especially while under power (climbing out, etc.) |
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| Hamo
rrVeteran Ireland |
Hamo |
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| Jeff polisena
rrElite Veteran westpalmbeachflorida usa |
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| The Old Guy
rrVeteran UK Surrey |
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| jbiter
rrKey Veteran Sebring, FL |
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| Jerry K
rrKey Veteran Houston Area |
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| MessyDan
rrNovice Johannesburg, South Africa |
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| mferraz
rrNovice Houston, TX |
Magnet and Muffler Q's When my fuel magnet went bad, I decided to forgo it in lou of a tradition clunk and header tank system. That's why I'm not sure if I had the problem before, but I'm pretty sure I am seeing more foaming now than I have before. At least, I think so.The muffler is on tight, and it have an O-ring fitting. It's an Hatori SB, and the engine is an YS91SR. The tank pressure comes from the engine backplate on the YS, unlike the OS where it is exhaust pressure.I hadn't thought of the engine bearing idea. If it was a vobration thing that could make sense.I might take you up on your offer Jerry, if you have the bearing and are willing to let me camp out for a bit while I take it down. |
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| mferraz
rrNovice Houston, TX |
Jerry Is the bearing you have for the SR or the ST. Are they the same bearing? |
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| imnxtc
rrVeteran BC.Canada |
Fuel foaming will cause what you are describing. The cause of the fuel foaming is not the crankcase pressure. It is caused by vibration which needs to be remedied. |
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| junkpilot
rrVeteran Alamogordo N.M. |
Header tank In your original post you stated you were running a YS 91. That engine uses crankcase pressure to push fuel to the engine. You don't need a header tank! Unless you just like the look.
The tank is going down because small amounts of air are entering the tank. Junkpilot |
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| Furious Predator
rrProfessor Kitchener, Ontario, Canada |
In your original post you stated you were running a YS 91. That engine uses crankcase pressure to push fuel to the engine. You don't need a header tank! Unless you just like the look. uel foaming will cause what you are describing. The cause of the fuel foaming is not the crankcase pressure. It is caused by vibration which needs to be remedied Team Leisure-Tech Team HelixRC |
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| mferraz
rrNovice Houston, TX |
Bad Vibrations Alright, so it seems that the vibration could be a likely cause. Come to think of it, I changed my clutch our right before this started happening. I took the engine out earlier this week, when I changed the main tank, but didn't mess with the clutch.What all should I be looking for in so far as the clutch, housing, and bell go. How would I look for the source of the vibration, and possibly narrow it down. Seems like it could be related to that clutch change out. I'm just not sure where I need to be looking for tolorances of 2/1000 or how.Thanks again for everyones help and advice! |
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| Furious Predator
rrProfessor Kitchener, Ontario, Canada |
Team Leisure-Tech Team HelixRC |
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