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I have run out of Cox 25 and 35%, is this the good stuff? Babe_b10
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I have run out of Cox 25 and 35%, is this the good stuff? Empty
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I have run out of Cox 25 and 35%, is this the good stuff? Empty I have run out of Cox 25 and 35%, is this the good stuff?

Post  rsv1cox on Mon Sep 23, 2019 3:41 pm

https://www.ebay.com/itm/223615921714

or go with his 35%? Run straight from the bottle or add castor?

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Post  Ken Cook on Mon Sep 23, 2019 4:08 pm

Bob. Fitz fuels you pictured is a very good quality fuel. I've been having great success using it. There's always Sig, when they have it. One fuel that I have noticed that's taken the front seat is Ritch's brew. Randy Ritch has been sponsoring the NATS with his fuels and I've been able to receive many samples of it. I like it the most I just have to work out the shipping issues as this is proving to be very expensive. I go through 2 gallons of high nitro a season and 6 gallons annually of stunt fuel between my son and I. I bought the fuel you show on EBAY 2 months ago and already I'm into the second quart with only a half left. I went with the 24% nitro and I have experienced no issues using it.
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Post  944_Jim on Mon Sep 23, 2019 6:05 pm

Bob,
According to the auction picture, it is 18% castor, 2% synth...that's 20% total. I'd run it straight from the bottle.

Of course, YMMV.

I will say I do fuel a little different than the other guys. Truggie fuel, low oil Helo fuel and castor. All mixed up using a spreadsheet that takes the known values from two fuels, a known quantity of castor, and gives you the overall numbers. Adjust any one of the three and watch the total numbers change.

I buy the helo fuel by the gallon, the high nitro truggie fuel by the quart, and the castor was last purchased by the quart. I still have plenty of the gallon, and am about to start in on the second quart of truggie fuel. My first 6 ounce of castor (from Walmart pharmacy) just got used up.

Why do I do this? To beat shipping charges! I "think" I'm saving about $8/qt by the time all is said and done.

So far, no Norvel , AP, or Cox engine failures.
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Post  rsv1cox on Mon Sep 23, 2019 7:14 pm

Thanks guys,

The glowplugboy fuel seems a good value, but 18% Klotz +2% synthetic? Maybe I should add a bit more of my SIG castor to it but I'm always confused as to how much.

I have a quart of Brodak 5% but I'm saving it for my larger displacement engines. I have run Cox engines on 10% Traxx with added castor, but never thought they ran to their full potential on that fuel..

I have run out of Cox 25 and 35%, is this the good stuff? P9230010

Last of my Cox fuel sits in that fueler. Ran this little made-up thin wall I put together a couple of years ago. Original metal star reed and a cylinder out of a P-40. Started first flip running backwards then burped back to proper rotation. Did that a couple of times, each running irregular for a few seconds. After about five of these the reed loosened up and it ran fine, running all the fuel out of the tank.

I have run out of Cox 25 and 35%, is this the good stuff? P9210010

It will go into my work in progress Muscaino Super Sabre rebuild. Gave up on the .020 / Space Bug Jr idea. Don't think they would pull it around.
I have run out of Cox 25 and 35%, is this the good stuff? P9210011
I have run out of Cox 25 and 35%, is this the good stuff? P9210012

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Post  Mark Diedrichs on Mon Sep 23, 2019 7:32 pm

The local HOBBYTOWN USA in my neck of woods sells various VP brand fuel mixtures for cars or planes. That would be Mason Ohio. 513 738 1576  Mark
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Post  roddie on Mon Sep 23, 2019 8:19 pm

Hi Robert, I've been running "Sig" Champion 1/2A fuel in my Cox engines.. ever since Cox's glow-fuel became unavailable to me. When was that? .... I'll say sometime in the early 1990's.

I've always purchased Sig's 1/2A "Champion" fuels by the QUART.. which has avoided paying a HAZMAT fee.. which is assessed on gallons.

My most-recent Sig fuel order was Feb. 2018.. for X2 quarts of Champion 25 (25% nitro) X2 quarts of Champion 35 (35% nitro) and X1 quart of Sig AA Castor Oil.. (used to be Baker's..)

I have run out of Cox 25 and 35%, is this the good stuff? 2018_f11
I have run out of Cox 25 and 35%, is this the good stuff? 2018_f12

The plastic bottles seem to be the same construction as they were.. 30 some-odd years ago, and I still have some of that old fuel.. which will still get a tired old engine running.

In a nutshell; I support Sig Manufacturing Co. as one of the very few model-airplane manufacturers remaining in business; that continue to cater to the internal-combustion engine modeler; be it C/L or R/C.

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Post  944_Jim on Mon Sep 23, 2019 8:58 pm

Nothing wrong with Sig or Glowplugboy fuels. If I weren't so painfully cheap, I'd go that proven route...proven by time and word of mouth! I do agree with the need for castor, so using either of those fuels gets a guy what his engines need with no real downside.
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Post  944_Jim on Mon Sep 23, 2019 9:26 pm

Taking a look at official Cox docs gives the numbers designed for these engines. You can't go wrong buying or blending to meet LM Cox numbers. Anything else, well, YMMV.

I just checked the downloads section. There are fuels make-up sheets for the official Cox blends. The 18% castor and 2% Dow lube lines up with the stuff near the top of this thread.

Look under "Information sheets," find the section titled "Other Cox related documents, " and read the three fuel mix docs (Glow Power, Flight Power, Race Power fuel formula sheets). In each instance 18% castor, 2% "Dow lube," while the methanol/nitro content gets adjusted up and down around the same oil percentages. I suspect Dow lube was (is?) synthetic.


Keep spinning, keep smiling! Keep crashing, keep new ships! No matter what, just try to keep these old engines happy!
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Post  Oldenginerod on Mon Sep 23, 2019 10:04 pm

944_Jim wrote:

I will say I do fuel a little different than the other guys. Truggie fuel, low oil Helo fuel and castor. All mixed up using a spreadsheet that takes the known values from two fuels, a known quantity of castor, and gives you the overall numbers. Adjust any one of the three and watch the total numbers change.

I buy the helo fuel by the gallon, the high nitro truggie fuel by the quart, and the castor was last purchased by the quart. I still have plenty of the gallon, and am about to start in on the second quart of truggie fuel.

You're not on your own Jim.  Over here I doubt you'd find any of the fuel brands that you guys talk about, and no-one makes fuel suitable for 1/2A/Cox engines.  Any shops local to me only stock car/buggy fuel.  Occasionally the one local toy shop who stocks anything aeromodelling-wise has a 25%-50% off sale for a day or two.  I buy 4 litres of car fuel which is 16% nitro and, after contacting the manufacturer, 18% oil including 2% castor.  (They were reluctant to give up their formula).  I add castor up to 25% total oil and if I want higher nitro I ad that as well using my favorite on-line fuel mix calculator.  Seems to work fine for me and is much easier and economical than trying to find the right commercial mix.  9% of the mix is castor and 16% synth, so I'm more than happy that my engines will be well protected and kept clean.

Rod.
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