The Dodge Demon represents the zenith of factory-built performance sedans, a machine engineered to dominate the quarter-mile while remaining street-legal. At its heart lies a supercharged 6.2-liter HEMI V8, a unit so potent it required special fuel to unleash its full potential. This is not merely an engine; it is a statement in engineering, a testament to what is possible when combustion physics and American muscle converge.
The Heart of the Beast: 6.2L HEMI SRT Hellcat Redeye
Under the hood, the Demon houses the 6.2-liter HEMI SRT Hellcat Redeye engine, a direct evolution of the legendary Hellcat powerplant. This aluminum V8 utilizes a bore-stroke configuration of 4.09 inches by 3.58 inches, displacing 6,166cc with a specific output of 840 horsepower. The secret to this immense power is a twin-screw supercharger, which forces air into the combustion chambers at pressures unimaginable in naturally aspirated engines, creating a flat torque curve that pins the driver to the seat.
Forced Induction and Fuel Requirements
To cope with the 14.5 psi of boost pressure, the Demon mandates the use of premium 91-octane fuel, and the owner’s manual strongly suggests 100-octane for optimal performance and protection. This high-octane requirement allows the engine to safely ignite the dense air-fuel mixture without experiencing destructive detonation, or knock. The result is a breathtaking 797 pound-feet of torque that launches the vehicle with a ferocity that demands respect and precise control.
Engineering Marvels: The Demon Crate Engine Program
Beyond the strip-focused Demon, the 6.2L HEMI ecosystem birthed the legendary "crate engine" program, making this technology accessible to builders worldwide. The Demon engine, minus its emissions equipment and computer tuning, was sold as a crate engine. This provided enthusiasts and engineers with a parts platform of unprecedented capability, effectively lowering the barrier to entry for building 700+ horsepower monsters without extensive machining or custom fabrication.
