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SVTPerformance's Chain of Restaurants
Road Side Pub
Random Facts and Useless Knowledge
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<blockquote data-quote="James Snover" data-source="post: 16027284" data-attributes="member: 67454"><p>In comparison to gasoline, nitro-methane is a low heat-content fuel, with a very low air to fuel ratio, and slow burning. These defects actually turn out to be the keys to the power it makes. Because the heat content is low, and the air-to fuel ratio is so low, by the time you add enough fuel to meet stoichiometry, you have a lot more fuel in the cylinder. So even though it has a lot less power than gas, there's a hell of a lot more of it. The slow burn also helps the engine make power, as the combustion event initiated in the cylinder is still going on by the time the exhaust valve opens. The result of that is: the piston gets pushed all the way through the power stroke. The rest of the burn happens in the header tube, one of the reasons for the awesome flame display of a nitro-methane burning engine.</p><p></p><p>The drawback is: if the fuel/air charge does not ignite on any given cycle, and the cylinder is then given another air/fuel charge on top of the previous one, the engine will encounter hydraulic lock, as the volume of liquid fuel in the cylinder now exceeds the capacity of the combustion chamber with the piston at or near TDC.</p><p></p><p>Nitromethane engines also routinely burn out the electrodes of the spark plugs very early in the run, and diesel the rest of the way down the track as the incoming air/fuel charge splashes against the super-hot exhaust valve. Long as the magnetos and plugs get you the first sixty feet, you good for the rest as long as you can keep the volume of fuel to the cylinders.</p></blockquote><p></p>
[QUOTE="James Snover, post: 16027284, member: 67454"] In comparison to gasoline, nitro-methane is a low heat-content fuel, with a very low air to fuel ratio, and slow burning. These defects actually turn out to be the keys to the power it makes. Because the heat content is low, and the air-to fuel ratio is so low, by the time you add enough fuel to meet stoichiometry, you have a lot more fuel in the cylinder. So even though it has a lot less power than gas, there's a hell of a lot more of it. The slow burn also helps the engine make power, as the combustion event initiated in the cylinder is still going on by the time the exhaust valve opens. The result of that is: the piston gets pushed all the way through the power stroke. The rest of the burn happens in the header tube, one of the reasons for the awesome flame display of a nitro-methane burning engine. The drawback is: if the fuel/air charge does not ignite on any given cycle, and the cylinder is then given another air/fuel charge on top of the previous one, the engine will encounter hydraulic lock, as the volume of liquid fuel in the cylinder now exceeds the capacity of the combustion chamber with the piston at or near TDC. Nitromethane engines also routinely burn out the electrodes of the spark plugs very early in the run, and diesel the rest of the way down the track as the incoming air/fuel charge splashes against the super-hot exhaust valve. Long as the magnetos and plugs get you the first sixty feet, you good for the rest as long as you can keep the volume of fuel to the cylinders. [/QUOTE]
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