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Old 01-06-2011, 07:46 PM   #1
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Hi, not sure if I post it in the right place.

Between the different brands of fuel, what's really the difference?

I meant say every brand says 25%, but does it mean the other contents are of different % mixture?

Also if say brand x has 25% nitro 12% and brand y has 25% nitro 18% oil, would that make a big difference???
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Old 01-06-2011, 11:44 PM   #2
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This article has some info that will help you understand the difference between fuels:

http://nitrokb.netne.net/engines/werksracingfuel.html
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Old 01-07-2011, 12:57 AM   #3
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Thanks. It's informative but doesn't really answer my question about using the nitro % but with different oil contents and it's effects.

Was I missing something??
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Old 01-07-2011, 02:05 AM   #4
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I guarantee that someone can explain it better than I can.

In the mean time, here are some additional articles/info on oil content:

http://www.myrcbox.com/?p=4660

MyRCBox.com: Should we use different fuel for racing or for bashing?
Byron Fuels: This all depends upon what end results you want. I always like to explain this to modelers as if we are dealing with real full sized engines. The harder you work an engine, the sooner it is going to break. That is one of the laws of physics. Now, if you are racing, you want speed and power and you have to accept a certain level of parts wear and replacement. If everyone you compete with runs a high oil and lower nitromethane, then you all win in the end. But if some of your friends are running competition fuels and you want to run with them then you have a decision to make. If you do not compete and you want the engine to last a lifetime, run a higher oil content fuel and donít worry about speed. The nice thing about modelers today is they have access to quality fuels with state of the art lubrication packages. Many of these will allow the engine to run hard and still be properly lubricated."

http://www.rchobbies.org/cars_eng-tuning.htm

"A final note about fuel: fuel with a lower oil content (for manufacturers that actually disclose the amount of oil in their fuels) should be run with a richer mixture setting. This doesnít so much relate to performance as it does to the benefit of the engine. Conversely, fuels with higher oil content have the extra lubrication that allows a leaner mixture setting with less risk of engine damage. Fuels with a lower concentration of lubricant are intended for competition use by experienced engine tuners. These fuels will make marginally more power because the lubricant thatís removed is replaced with power-producing nitro and methanol. Evaluate your tuning ability honestly before you run out to buy fuel with a lower oil content."

http://www.rc-truckncar-tuning.com/RcNitroFuel.html - See #3.
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Old 01-07-2011, 06:54 AM   #5
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Yes, the more oil content in the fuel, the less power it would make compared to the same volume of another fuel with less oil.

But with fuels that have a total oil content of say 15%, it then depends on the amount of Castor and Synthetic oil they use. One might use 5% Castor 10% Synthetic, the other might use 7% Castor 8% Synthetic.
Castor is a better quality oil, but is alot more expensive to manufacture, thats why there is less of it.
Not only that, but the Synthetic oil will lubricate the engine to a certain temperature, whereas the Castor oil will burn at a much higher temperature, something I think nitro engines don't produce (maybe they do, not sure) hence why they use less of it in the mix.
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Old 01-07-2011, 07:21 AM   #6
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Quote:
Originally Posted by rmdhawaii View Post
http://www.rchobbies.org/cars_eng-tuning.htm

"A final note about fuel: fuel with a lower oil content (for manufacturers that actually disclose the amount of oil in their fuels) should be run with a richer mixture setting.
Oil is the part of the fuel making the viscocity of the fuel, more oil the thicker the fuel and less oil makes it thinner. The richer setting on the HSN depends and I would say leaner. Switching to less oil makes a faster flow through the needles and creates a richer setting automaticly you have to correct.
Also with less oil you will get more methanol what will give more runtime.

Quote:
Originally Posted by DJ_Shakespear View Post
Yes, the more oil content in the fuel, the less power it would make compared to the same volume of another fuel with less oil.

But with fuels that have a total oil content of say 15%, it then depends on the amount of Castor and Synthetic oil they use. One might use 5% Castor 10% Synthetic, the other might use 7% Castor 8% Synthetic.
Castor is a better quality oil, but is alot more expensive to manufacture, thats why there is less of it.
Not only that, but the Synthetic oil will lubricate the engine to a certain temperature, whereas the Castor oil will burn at a much higher temperature, something I think nitro engines don't produce (maybe they do, not sure) hence why they use less of it in the mix.
Castor oil is a nature product, as with wine the weather season makes the blend and differs in quality from year to year, with synthetic it is more stable and synthetic 2-stroke oil is made to burn with the combustion which has its pro's and cons in the use and performance. A mix of castor and synthetic has been prooven many times.
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Old 01-07-2011, 09:27 AM   #7
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i knew there are people with oil knowledge out there. Thank you all.

Now I know there is difference between fuel made RC planes and RC cars, so can i say in general they can used for either? or it is a no no?

More oil then synthetic or more synthetic than oil is better??
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Old 01-07-2011, 10:14 AM   #8
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All nitro fuels are a mixture of nitro, methanol and oil(s). Boat and airplane fuels have more oils because these engines are running on full throttle all the time and they do not run that high revs so a bit more oil will not affect the top rpm. The resistance these fuls with more oils have can affect the running of out car engines, the more hotter timing is making the engine more critical and the oil can create an unstable running engine.
In other wordt, I would not go for airplane fuels.

My best mixture of oils in the fuel was 3% Castrol M50 (castor) and 6 or 7% Castrol MSSR (dynthetic). It hase a good balance between the function of synthetic and castor and does give a good performance and a almost clean combustion.

The shape of the P/S set can make a difference in which oils you do need. The oil on the surface of the piston and sleeve is also acting like a pistonring. If you have a worn P/S set a fuel with 10-12% pure castor oil can make this engine run like never before because the thick oil will give back the engine some compression.
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