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ChadS
11-04-2004 06:48:04
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Re: 460 question part 2 in reply to the tractor vet, 11-03-2004 21:43:59
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C-12 is a pretty good racing fuel. It does have a high octane rating, but was designed for high rpm use. (above 4000rpm) I am using a different mixture of fuel designed for low rpm, high compression engines. It makes a huge difference in how the engine makes power in the low rpms. I have been concerned with preigntion, and detonation in this engine. Fuel is a mix of 94 octane, with ethanol added to aide in the preigntion, and detonation. I get the fuel from farm beaureu COOP. And the fuel makes power. Hard to find a good pulling or farm fuel that will do what this fuel can do. Been running it for years, in H engines making 290+psi cyl pressure. Instead of using more octane, the ethanol cushions the erratic conditions that create preigntion and detonation. It burns cleaner in the cyl. So the fuel does more,, with less octane. Octane,, can actually shoot you in the foot in these cases. Too much,, will create carbon deposits, which float around in the cyl, stick to the electrode of the plugs, they can foul the plugs, give an inacurate plug color reading to see if the engine is running efficiently, also, when these little carbon deposits add up, the get red hot, and create hot spots in the combustion chamber, these little sparks from this, is one of the main reasons for preigntion and detonation in higher compression engines. Also, in low rpm engines, the slower the burn in the cyl the better, low rpm engines, like tractor engines have so much more time to create efficency over a high reving engine. See racing fuel like C-12, is meant to burn very fast in the cyl. At high rpm the fuel has to get in, burn up fast and get out, ready for the next charge. C-12 helps lite the fire better in the high rpm engines, and makes power and torque at the high rpm. at low rpm,, that fuel does not work as well as other fuels. the burn time is way too fast for the rpm, it does burn well, but just dont burn long enough to help a low rpm engine make power. Tractor engines,, are slower in operation VS the racing engines. There is so much more time to create efficency and be able to recognize the engine charateristics to establish a bit of different technology to make these old engine run so much better. Thats my opinion on fuels, and octane. Let me ask you a question,, on the work horses, what was the most common break down inthe cyl head on the IH 6's? Valves? rings, cracking heads? ChadS
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