A valve arrangement in the cylinder head where the valves are at an angle to the cylinder bore. Canting the valves can make for a straighter path for air to flow into and out of the intake and exhaust ports. The area of an engine in which the air/fuel mixture is burnt.
There are lighters out there designed to burn up to 2500 degrees Celsius, so it is certainly possible to find one that is up to the task if you have a project that involves melting glass. One reason that most lighters will not melt glass is that they are simply not hot enough.
This bouncing around makes it so that molecules are more spread out in hotter air then colder air so the hotter air is less dense and the less dense air rises above the colder more dense air. Answer: Assuming good mixing and proper flow conditions a butane/air flame (like a lighter) can reach temperature of 1,977o C.