Help ! Which fuel to use ?  
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> RC Fuels >> Help ! Which fuel to use ?
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Help ! Which fuel to use ? - 3/26/2002 5:50:27 PM   
ticonderoga


 

Posts: 3
Joined: 3/11/2002
From: Fl panhandle
Status: offline 		I have a ".60 size" Great Planes Xtra-300 with a new OS .91FX in it, and it flies terrific ! BUT, I've had so much advice on fuels to use that I am thoroughly confused. The engine has about 3 hours on it and starts fine. My concern is the long term life of this engine. I started using 15% Morgan, but I'm now down to 5% due to very high compression vibration..? I couldn't keep the cowl screws on it ! I'm contemplating buying an OS 1.60 and I'll have the same quandry again. Any advice appreciated, thanks
       Post #: 1

Wow - 3/26/2002 8:02:54 PM   
bob_nj


 

Posts: 3474
Joined: 12/3/2001
From: Vineland, NJ, USA
Status: offline 		That's a busy post. Going from a higher to lower nitro% is OK in my book for various reasons that we can get into later if you like.
Personally I don't own or run anything but 5% in my MVVS .40, Rossi .45, OS 1.60 or Moki 1.35. That part is fine.
That being said, I don't think it's the cause of your vibration. All one cylinder engines exhibit a resonant vibration at certain RPM levels. Although we can't change that fact, it doesn't make our lives or cowls any easier. The things we can change or check are things like prop balance, engine mount to firewall and engine mount to crankcase screws for tightness, and crank runout.
Leaning the engine out a little sometimes helps. If any of this makes sense let me know. Take care_Bob

< Message edited by bob_nj -- Mar 26 2002 7:56PM >

(in reply to ticonderoga)
       Post #: 2

Help ! Which fuel to use ? - 3/26/2002 10:48:18 PM   
Fuelman


 

Posts: 1009
Joined: 12/31/2001
From: Jordan, NY, USA
Status: offline 		The fuel does not cause vibrations, like Bob said, an unballanced prop or something loose will allow things to vibrate more than they otherwise would.
I know that the various isolation mounts aviable do work well, I especially like the DuBro one.
5% runs great in those engines.

Fuelman


_____________________________

Fuelman
Cooper Fuels LLC

(in reply to ticonderoga)
       Post #: 3

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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> RC Fuels >> Help ! Which fuel to use ?
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