The stoichiometric fuel ratio is the ratio of fuel to oxygen that allows all the fuel to burn and leaves no oxygen left over at the end of combustion. Your second challenge is to try to get the fuel as close as possible to the stoichiometric fuel ratio. So, your first challenge is to get your fuel in the 3~9% range so that the gun will fire. If you've built a combustion spudgun and you can't get it to fire the most likely problem is that you are using too much fuel. If you inject less than ~3%, or more than ~9% of the chamber volume in fuel then the gun will not ignite. For most hydrocarbon fuels ( propane, butane, flammable aerosols etc.) the combustion limits is about 3% to 9% by volume. ![]() The combustion limits is the range of fuel concentration (usually expressed as the volume percent of fuel in the chamber) that will actually ignite. All fuels have a property called the "combustion limits". For all common fuels too much fuel won't ignite. 2 Common Fuels for Combustion Spud Gunsīefore discussing the various fuel options we'll start with the most important aspect of fueling a combustion spudgun.Īn inexperienced spud gunner might think that adding more fuel to the chamber will increase the power of their gun. ![]()
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