Hellcat 245 performance engine- Everything you need to know

Hellcat 6.2L Supercharged HEMI V8 — Key Details & Performance

Type: V8 (90° configuration), HEMI design.
Displacement: 6.2 liters (~376 cubic inches).
Block Material: Cast iron block.
Heads: Aluminum alloy cylinder heads, hemispherical combustion chambers (“HEMI”).
Compression Ratio: ~9.5 : 1.

Type: Twin-screw supercharger (not roots-style).
Boost Pressure: Around 11.6 psi in the standard Hellcat version.
Supercharger Displacement / Size: According to one source, the supercharger displacement is “2.4-liter” (for base Hellcat).
Supercharger RPM Capability: The supercharger internal components can go up to very high rpm; for example, the supercharger’s design is made to be efficient, with tight clearances, to reduce leakage.
Intercooling: There is a low-temperature cooling system — dual water-to-air intercoolers are used, plus a variable-speed electric water pump.
Additional Cooling Feature: There is a “Race Cooldown” feature that, after engine shutdown, keeps the intercooler pump or fans on to cool the intercooler.

Crankshaft: Forged-steel crankshaft, with induction-hardened bearing surfaces. This is to withstand the very high combustion pressures under boost.
Pistons & Rods: Forged pistons, and connecting rods designed for high load.
Piston Pins: Diamond-like carbon-coated pins (to reduce friction and increase durability).
Valvetrain: The engine uses a camshaft (nodular-iron cam in crate version) and robust valvetrain to handle performance.
Crank Dampener: Tuned to high RPM (it’s tested up to very high forces) per spec sheet.

Power (Standard Hellcat): ~707 hp (in early variants) according to multiple sources.
Torque (Standard): ~650 lb-ft (for some early or specific models)
Alternate Figures: In some variants/years, power is 717 hp and torque ~656 lb-ft.
RPM Limit / Redline: Peak power around ~6,300 rpm (varies by model).
Fuel Requirement: Uses premium fuel (e.g. 91 octane required).

The engine is engineered to survive the high stress of forced induction. For example, the main bearing caps are cross-bolted (for extra strength) to handle crank loads.
Thermal management is critical: the intercooler system, water pump, and cooling strategy helps manage the heat from the supercharger.
There is a design for “heat soak” mitigation: superchargers generate a lot of heat, and efficient intercooling plus a well-designed intake path helps.

Redeye / High-Output Variants: There are more powerful “Hellcat High Output” or “Redeye” variants. For example, some versions make up to 797 hp or more.
Supercharger size/boost changes in those higher trims: Redeye variants reportedly use a larger supercharger (e.g., 2.7L) to boost more.
There are even crate engine versions (for engine swaps or builds): e.g., check the Hellcat Crate Engine 6.2L supercharged version.

This Hellcat engine has been used in several high-performance Dodge vehicles: Challenger SRT Hellcat, Charger SRT Hellcat, etc.
Because of its strength and performance, it’s also used in crate engine setups for custom builds.

Strengths:

Very high power and torque: Thanks to the supercharger + strong internals.
Robust internals: Forged crank, strong block, strong rods, high-grade pistons — built to last under boost.
Excellent cooling design: Intercoolers + aggressive cooling help maintain performance.

Trade-Offs / Challenges:

Fuel consumption: Such a powerful supercharged engine will be thirsty, especially under boost.
Heat: Superchargers generate heat; managing that is critical.
Maintenance: Higher-stress parts could mean more careful maintenance (oil, supercharger care, etc.).
Weight: Cast iron block + supercharger add weight compared to a naturally aspirated V8.