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Post  Reptile Sun May 19, 2013 2:24 pm

I am wanting to run some old cox gas cars and was wondering what gas works with these .049 motors...I have normal nitro gas for my new RC gas cars is it ok to use the new style nitro gas?

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Post  Admin Sun May 19, 2013 3:11 pm

Hello, you'll want to use a fuel with about 20% castor oil (not synthetic) and between 10-30% nitro. You wouldn't want to use car nitro fuel unless you boost the castor oil content. If you can, would look for a fuel called "1/2-A Fuel". I have been using Sig Champion 25 and Byron 1/2-A for years. Basically, check the oil content making sure it contains at least 20% oil with a minimum of about 16% castor oil. Castor oil is important as it lubricates the ball and socket joint in the piston. There is a great fuel guide offered by Bernie from Cox International that you can download here > http://coxengines.ca/files/FG.pdf

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Post  RknRusty Sun May 19, 2013 3:18 pm

Reptile, same as the planes. 15-25% nitromethane with 20% oil, at least half of which Must be castor.

Sig Champion 25 is good. Go to sigmfg.com. The site is a real pain in the butt, so I can't link you to the fuel page. On the left, click on aircraft, then field gear, then fuel, then airplane fuel(NOT car fuel), then click on the picture of Sig Champion fuel to get the list.

EDIT: Jacob beat me to it.

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Post  reptile Sun May 19, 2013 3:56 pm

Hi Thank you guy's

What about this brand I see on E-bay can you look it over and see if it's up to specs? now is it better to run 25% or the 30% I thought 30% would make the motors easy to run compared to the 25%?


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Post  reptile Sun May 19, 2013 4:00 pm

Can't post a link

It's called arctic R/C hyper fuel on e-bay for 1/2 A

here is the specs is this any good?

1 QT 1/2A 30% NITRO FUEL FOR .049 .020 25% CASTOR COX, WEN MAC, THIMBLE DRONE,



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Post  RknRusty Sun May 19, 2013 7:07 pm

30% nitromethane runs a little higher performance than 25%, but you'd be hard pressed to tell the difference. It's a little harder on the internals than lower %. I quit using anything over 25% since I'm not in competition and my engines aren't finely tuned to the point where it would make a difference, and I want them to last a long time. Anything 20% or over makes the engines easy to crank and tune.

Here's the same stuff in 25%. Looks like good stuff:
http://www.ebay.com/itm/1-qt-25-NITRO-HYPERFUEL-FOR-1-2A-049-020-010-25-PURE-CASTOR-OIL-/251261786156?pt=US_Radio_Control_Control_Line&hash=item3a805e982c

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Post  reptile Sun May 19, 2013 9:36 pm

Hi do you think it's better than the cox 1/2 A fuel they sell at tower hobbies ?
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Post  Mark Boesen Sun May 19, 2013 10:12 pm

yes, totally better! The 'Cox' fuel is mostly synthetic oil and has a low total oil volume.
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Post  Reptile Sun May 19, 2013 10:22 pm

So I don't know what to go with the sig 25 % or the arctic 25% the Sig uses 1/2 caster and synthetic blend but the arctic uses only 100% caster oil.

Will the caster synthetic blend make the motor run cooler and last longer since synthetic oil supposed to be better than normal oils? also heard this type will make way less oily mess all around the motor in the cars.
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Post  Cribbs74 Sun May 19, 2013 10:37 pm

I wouldn't worry to much. All the fuels you described will do the job. For me price and availability would be a deciding factor. Shipping costs on Nitro fuel can be a real bear.

I tend to lean on the more castor SIG as I have never had a problem with it. I haven't tried the others though either.

Bottom line is you won't ruin your engines with the fuels you mentioned. How long has it been since the cars last ran? The reason I ask is even the best fuel won't work in a gummed up engine.
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Post  RknRusty Sun May 19, 2013 11:15 pm

I agree with Cribbs. Any of the ones that fall within the specs we mentioned work fine. After that it's a matter of preference. Actually, even though synthetic is slicker, castor causes an engine to run cooler than synthetic, because rather than partially burning with the F/A charge, it blows out of the exhaust in it's original form, taking heat with it.
And making your machine greasier than snot! lol!

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Post  Reptile Sun May 19, 2013 11:28 pm

Thanks for the help guy's I just ordered this.
SIG CHAMPION FUEL 25% RC QT
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Post  Admin Sun May 19, 2013 11:49 pm

We're glad to help! Just so you know, its easy and FREE to join the forum!




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