There is a common misconception that revving the engine will warm it up faster. This is not true. Revving the engine actually decreases the amount of time it takes for the engine to reach operating temperature. When you rev the engine, you are increasing the demand for heat from the engine. The engine responds by burning more fuel, which increases the rate of heat transfer from the combustion chamber to the cooling system. The engine in a car is made up of many different parts, all of which need to work together in order for the car to run. The engine relies on a variety of chemical reactions to create the energy that powers the car. These reactions are most efficient when they are at a certain temperature. When the engine is cold, these reactions happen more slowly and less efficiently.