I copied this from the Byron home page: CEN RACING... tell us what you recommend.

Byron Originals markets a tested and proven fuel for nearly every possible model engine application. The complete fuel line now includes 43 different products.

Oil percentages are not a proprietary secret to Byron Originals. Oil content is so easily checked through evaporation that to claim it a secret should be embarrassing for any manufacturer who makes such a claim. Oil content percentages are stated right on the bottle of Byron Fuel. These percentages range between what is specifically needed for a certain application and what modelers want as a form of personal insurance and comfort.

Our most popular blends are our Premium Sport Blends with a 16% total oil content. The three most popular Premium Sport Blends of 5%, 10% and 15% Nitro are also available in what we call our Traditional Blends (20% total oil content) and our Premium 18 Blends (18% total oil content). 1/2A fuel is available in 16% total degummed castor. RACE Fuels range from 11% to 18%, depending upon the application and the recommendation of the engine manufacturer. Specialty fuels, such as Heli Pro-Glow and Super Tigre Fuel utilize oil contents of 10%, 24% and 10% respectively.

http://www.byronfuels.com/

Nitromethane represents a nearly perfect fuel that brings its own oxygen into the combustion process. While there are many theories on some of the effects nitromethane has on temperature and performance, none applies across the board in all applications and with all types and sizes of engines. The nitromethane percentage you need depends a lot on how your engine was designed and the engine manufacturers’ recommendations should always be considered one of your top recommendations.

Some modelers are under the impression that nitromethane contributes to a higher combustion temperature which is not always true. Depending upon how your engine is set up, higher nitro can actually turn down the heat in certain situations. If you experience predetonation, then it is recommended you go to a lower nitromethane level. Too high a nitro content can cause pitting of the top of the piston and the inside of the glow plug dome. If you run high nitro, you should disassemble your engine occasionally and check it for pitting. If you choose to run a higher nitro than normal, you may need to shim the glow plug head to compensate.

Increasing nitromethane does not always assure higher performance. Due to the cost factor, if you are a sport modeler, run the lowest nitromethane you can as long as your engine is starting well in cold weather and performance is smooth and responsive.

Even though you may select a higher oil content for engine break-in, you should always break your engine in on the same nitromethane percentage that you plan to run after break-in.



I have now broken in my genesis and will be moving from the 20% nitro mix (with 20% oil) to a 25% nitro fuel with a 15% oil mix. This should be enough to keep the temperature low/stable and minimise the wear on the cylinder. As long as i take it easy with the truck during this change over it should be ok.