The Dynamite 12V DC Nitro Engine Heater will properly pre-heat your .19-.32 size engine to 140-158˚F (60-70˚C) in approximately 10 minutes based on ambient temperatures. It helps to relieve the stress on the crank, connecting rod, piston and sleeve during warm-up. It will also help provide a smooth engine start, with reduced stress on your starter box. Fuel consumption will be reduced, as you do not have to spend time and fuel warming up and adjusting your engine. Additionally, a pre-heater will increase the life of your plug. It is also perfect for break-in, as it reduces the “pinch” on your new engine. This nitro engine heater will pay for itself many times over with increased engine life and performance!