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Fuel question for MMVS .49 glow engine.

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Old 05-19-2013, 07:41 AM
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RCer
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Default Fuel question for MMVS .49 glow engine.

Hello All


I have two MVVS .49 glow engines that are installed in a twin engine plane (one has a rerversed crank just for fun) so it is important that they run reliably. I do use on board glow that kicks in progressively at low power.

I have always been using fuel with 0% or 5% Nitro and 20% oil (50/50 synth/castor) and been very happy with the engines. However, my fuel supplier stopped mixing fuel so now I only have access to pre-mixed fuel. Most of it has 10%+ Nitro with 17% synth oil. I did find a mix with:

- 0% nitro
- 15% ML70 synthetic oil


Can this be used if I mix in 5-7% castor for a 20-22% oil content (only 25-31% castor)?



What do you think? Of course I could just try it out but I am a bit worried because Im using the engines in a twin.


Thanks for your comments/help
/RCer

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Old 05-19-2013, 10:24 AM
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Default RE: Fuel question for MMVS .49 glow engine.

We have run these engines on as little as 2% castor oil without failures. However, try consistent running on synthetic oil first. if the engines takes well to it for a series of flights, all is well even without castor. If not, engine performance and tunability will get worse with every tankful, to be restored when the engine gets castor again.
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Old 05-19-2013, 10:45 AM
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Default RE: Fuel question for MMVS .49 glow engine.

Dear Pe

Thank you very much for your expert advice.

Do you think the 0% nitro, 15% synth will be enough oil to try out with or should I increase it to 20% synth?


Thanks
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Old 05-19-2013, 10:50 AM
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Default RE: Fuel question for MMVS .49 glow engine.

Just try the engine on the fuel at zero nitro/17% oil. If it keeps running strong you are good to go.
The small MVVS do not like synthetic oil at all, but with the larger ones we had good results.
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