FYI: A low-temp thermostat improves performance
in two ways: first by increasing the mass flow rate of intake
air, and second by reducing the engine's tendency to detonate.
From the laws of physics, cooler air is denser than
warmer air. Since horsepower increases as the amount of air
and fuel burned increases, cooler air (with more air molecules
per cubic inch) makes more power. The
low temp thermostat allows the engine to cool down to a lower temperature
than the factory thermostat to make more power. At the drag races, water can be sprayed
on the radiator between races to drop the temperature and improve performance. A low temp thermostat ensures that you leave the line at the same temperature on each run to give consistent maximum performance for bracket racing.
A lower temp T-stat reduces the temperature of both
the incoming air/fuel mixture and the surfaces of the combustion
chamber, greatly reducing the tendency to detonate. Detonation is an audible pinging / knocking
sounds, refers to the spontaneous explosion of the unburned air/fuel
mixture in the combustion chamber. Detonation reduces power, and can severely
damage an engine. A lower temp T-stat allows the engine to safely develop more horsepower.