RC Fuels Nitromethane, Castor Oil, Synthetic, heli fuel, 4 stroke, etc...Fuel Q&A is here!

Fuel problem?

Old 02-25-2010, 07:13 PM
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Default Fuel problem?

Has anyone had problems with Omega fuel lately? I'm not sure that's the trouble, but after about a month of trying to figure this out, fuel is the only common denominator.
Here's what happened. After switching to Omega, one of my engines became hard to start and hard to tune. I eliminated all of the most common problems like plugs, fuel tank, ect. but no change. Then when I ran it in another engine (both had always run perfectly), same problem! This is not old fuel, it was recently purchased at LHS. Here is what both engines are doing. Hard to start, run rough and will not clear out unless glow ignitor is left on until engine is completely warmed up. Then when held at WOT, engines have a hard miss. Sounds like running an ignition engine wide open while flipping the kill switch on and off. Both engines do this wheather in the airplane or on the test stand.
They always quit running within a minute or less. I'm not knocking Omega fuel because that may not be the problem, it's just the only thing I have not changed yet.
Any ideas?

Old 02-25-2010, 07:31 PM
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Default RE: Fuel problem?

I have never had any trouble with Omega fuel, but it does sound like a fuel problem. Maybe you did get a bad jug.
I would try another jug of fuel, or borrow some from someone at the field just to try it.
Old 02-25-2010, 07:36 PM
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Default RE: Fuel problem?

What can happen during the filling process is that the anti foaming additive rises to the top of the vat. The last jug filled gets way too much of it and burns poorly.
Old 02-25-2010, 09:28 PM
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Default RE: Fuel problem?

Sounds like you have done a good job of investigating. I would call Omega and see if they would like a sample sent to them, they should if they are smart. I would expect some "good will" in return if the fuel has a problem. Let us know the outcome.
Old 02-26-2010, 09:31 AM
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Default RE: Fuel problem?

Old man winter causes this too
Old 03-01-2010, 01:37 PM
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Default RE: Fuel problem?

Sounds like some of the methanol evaporated. If their is a lot of oil then that may be the problem. It could also be water. You could possibly use it with a hotter plug.
Old 03-02-2010, 11:16 PM
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Default RE: Fuel problem?

What engines Brand, size,2 or 4 stroke...and what blend of fuel, meaning nitro / oil percentage andpercentage ofsynand castor?

Old 06-23-2010, 08:13 AM
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Default RE: Fuel problem?

solution found?

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