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LOL fuel with out nitro

Post  getback Sat Nov 02, 2013 12:06 pm

fuel with out nitro Img_0417     I got this fuel 20% from someone it was for his car with less nitro needed , bought the castor oil pure AA by sig  for blending model aircraft fuels . the person at the hobby store said 2 oz.s to a gal. would be fine for 049s I value everones opinion on the fourm so I am askings . THANKS AS ALWAYS!!
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LOL Re: fuel with out nitro

Post  Cribbs74 Sat Nov 02, 2013 12:15 pm

Well. A few questions first.

How much fuel is left? How much oil and what percentage is castor? Did you say there is no Nitro?

You need at least 15% Nitro to get it to needle well and at least 20% oil with at least half being castor.

Once you know how much fuel you have and the percentages of fuel/nitro/methanol you can do some calculations and see how much oil you need to add.

Do not add 2oz and call it good... You will most likely need more.

Let us know

Ron
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LOL Thinking fuel with out nitro

Post  getback Sat Nov 02, 2013 12:43 pm

the traxxas fuel container is 3/4 full and no were on it tells how much castor oil is in it only do not use in airplane or boat engines fuel with out nitro Img_0423
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LOL Re: fuel with out nitro

Post  Cribbs74 Sat Nov 02, 2013 12:48 pm

From what little info I could find online it appears it has 16% oil. I have no idea on the castor/synth ratio.



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LOL i am throwing this out again ( fuel )

Post  getback Sun Nov 03, 2013 1:48 pm

I don't want to throw  this free fuel away but don't want to burn up any engines ethier !!??
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LOL Re: fuel with out nitro

Post  Cribbs74 Sun Nov 03, 2013 2:09 pm

Well,

I am a gambling man by nature so if you are too then just calculate your total volume of fuel which would be 3/4 of 1 gallon.

So by my poor math skills 3/4 of a gallon is 96oz, 16% of that is 15.36oz

So if you want 20% oil you need to add 3.84 oz of castor.

Now... The gamble is how much castor does it already have? If it had 8% or more you will be good if not, you may ruin the engine over time.

It's up to you. It may be just fine. Hopefully someone here will check my math/method as it's not my strong suit.

Ron



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LOL Re: fuel with out nitro

Post  pkrankow Sun Nov 03, 2013 6:41 pm

I don't feel like running the math.

If you want to determine the oil percentage, measure out a quantity (use a gram scale, say 100g) in a LARGE FLAT container that you recorded the "tare" weight on. Use a throw away aluminum foil pan unless you have a suitable container.

Place the container in the sun on a warm day for a few hours and weigh again, wait another hour and weigh again...etc until the weight remains constant. The castor will never evaporate. The synthetic oil also resists evaporation. The nitromethane and the methanol will evaporate readily.

Now we know, or can at least make an educated inference as to the total oil content of the fuel in question. Switching from by weight to by volume involves some looking up and some simple calculations, but the differences are pretty small for the argument.

Now, if it is 16% synthetic oil, no castor oil, I would probably add 5% volume to volume castor oil and call it good. This means for 50 fluid oz of fuel I would add 2.5 fl oz castor oil. (BTW a tablespoon in 1/2 oz, so 1 tablespoon castor per 10 oz)

Add 1 tablesoon per 8 oz if you want even. That is 6.25% added castor. More oil won't hurt any.

Too much oil will cause short runs, and excess cooling first. There really is nothing to worry about as far as engine harm until you get over 30% oil content, difficult operation will get in your way first anyways.

*I* would probably just put in drug store castor and not worry any. This is to use up the fuel bashing, not to compete with. The added buildup from drug store castor vs degummed castor in a single gallon is not worth worrying about even if you run it all through the same engine. The synthetic is going to limit buildup anyways.

Phil
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