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Fuel Dinosaur -> RE: How to determine fuel content? (8/5/2007 12:28:11 AM)
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You can use it as a nitro source for a low nitro fuel, like 0, 5 or 10% nitro to bring up the nitro a bit. Otherwise, it makes a good weed killer like the previous post. It is not easy to measure the contents of fuels. You can use gas-liquid chromatography for the volatile components and can get the oil percentage and type from the manufacturer in some cases, but not all. As a general rule, fuels in the U.S. often have much higher nitro content than needed for many engines and some fuels do NOT have enough or a good enough lubricating oil. Seems like folks like to see just how much nitro they can put in their fuel, and how little oil they can add, just before the engine sizzles after a lean run.[;)] I used to run rat race and combat and found out very early what you could and could not use in an engine for high and for maximum performance. For routine flying, 0-15% nitro will work in almost all engines. A few with higher compression ratios will run on no nitro, or at most, very little. I run 15% in my Saitos all the way up to the 170 radial, the .91 FA engines run fine on 18% oil and 15% nitro, year round. Some add some castor to the fuel, others run NO castor. Some use a little lower oil content. My experience is that engines are expensive, oil is cheap. I prefer 2-4% max castor and 15% nitro, runs great on that fuel. Fuels over about 30-35% nitro require additional components to take the nitro and keep it in solution, for boats, 60% is not uncommon for racing. I would not run this boat fuel in my engine (unless it is a boat engine!). You can add it to a low (0-10% nitro) fuel as a nitro additive okay.
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