Proper fuel oil mix

OhBee Wed Mar 11, 2020 2:10 am

What fuel/oil mix could I, should I run in OS .15's AND Enya .35's? Only fuel I have is Cox 25 and 35% nitro. I know thats too much nitro for those engines. Don't want to buy umpteen different fuels for everything!

Oldenginerod Wed Mar 11, 2020 2:32 am

OhBee wrote:What fuel/oil mix could I, should I run in OS .15's AND Enya .35's? Only fuel I have is Cox 25 and 35% nitro. I know thats too much nitro for those engines. Don't want to buy umpteen different fuels for everything!

You'd probably want no more than 10% nitro for either of those engines. I think Enya actually recommend 5%. If you're talking older bushed or iron pistoned engines, then castor is in order, probably around 20%. Half castor half synth would be ok.
My experience is limited, so others may agree or disagree. Feel free.

OhBee Wed Mar 11, 2020 2:57 am

Near what I was thinking based on my research,but felt safer asking the "experts" here! Wink

yes bushed engines...but one newer OS is an aluminum piston in a plated bore.

**944_Jim** Wed Mar 11, 2020 6:06 pm

I'll email you a link for taking two known fuel types and mixing.to get a resultant blend.

You only have add straight methanol and a bit of caster to bring your 25% down to 5% with required castor oil. Castor can be bought in 6 oz bottles at Walmart so you don't have to stock up on lots of chemicals.

It'll be in you inbox in a couple hours (after dinner).

NEW222 Wed Mar 11, 2020 8:19 pm

I have run both aforementioned engines with success using Morgan's Omega 5% fuel. I also add 2 or so extra ounces of castor per gallon just because I want to add a bit of insurance.....

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