A Look at the Upgrades of the 2021 Hellcrate Redeye Supercharged HEMI

A Look at the Upgrades of the 2021 Hellcrate Redeye Supercharged HEMI 9 photos
6.2-liter Supercharged HEMI on the Challenger DemonDodge Challenger DemonDodge Challenger DemonDodge Challenger DemonDodge Challenger DemonDodge Challenger DemonHellcrate RedeyeDodge SRT Trackhawk
If the 707 hp Hemi Hellcat engine was a step too slow for your project car, Mopar has you covered with the release of the new Hellcrate Redeye Supercharged HEMI that can spit out 100 more horses while benefitting from many upgrades.
The third generation HEMI V8 got an all-new supercharged high-performance upgrade in 2015 and debuted on the Dodge Challenger and Charger.

The engine was named Hellcat after the glorious Grumman F6F Hellcat fighter plane that helped U.S. forces win the air battle for the Pacific during the Second World War.

At the time, it was the most powerful engine produced by Chrysler and the most powerful engine fitted to a mass-produced muscle car ever.

A crate version of the Hellcat dubbed the Hellcrate was made available in 2017. It comes with chassis and engine harnesses, accelerator pedal, oxygen sensor, charge air temp sensor, power distribution center, and a powertrain control module.

The engine was so successful that FCA decided not to limit it to muscle cars, giving birth to the insanely fast muscle SUV, the Jeep Grand Cherokee Trackhawk.

Dodge SRT Trackhawk
Starting with the 2021 model year, the Hellcat will also be used on a high-performance SRT version of the Dodge Durango and the monstrous Ram 1500 TRX pickup truck.

Since good engines can always be better, the engineers made the Hellcat more powerful for the 2019 Dodge Challenger model year.

The upgraded unit called the Hellcat Redeye that powers the 2019 SRT Demon and 2020 SRT Redeye Challengers features several upgrades and will now be available to order as a crate engine kit.

The powerplant has the same 6.2-liter displacement as the ‘standard’ Hellcat but produces 807 hp, which makes it the most powerful production V8 in muscle car history.

Hellcrate Redeye
The 2.4-liter supercharger on the Hellcat was replaced with a new 2.7 liters twin-screw supercharger that can deliver 14.5 psi of boost and has an increased 6,500 rpm redline.

To accommodate this modification, a new forged alloy steel crankshaft with 90.9-millimeter stroke and revised balancing is added. Also, the crank bearing surfaces, and main bearing clearances are optimized to deal with the higher power output.

Moreover, the upgraded camshaft is made from gun-drilled 5150 steel alloy to facilitate higher RPMs and decrease weight.

The piston-to-bore clearance is increased by 30-micron and the standard pistons have been replaced with forged high-strength alloy versions. New powder-forged connecting rods that use ultra-high tensile fasteners have also been added.

The valvetrain features redesigned valve-springs and rocker tips that receive 30% more oil than the previous design, improving lubrication and cooling.

Another redesigned assembly is the oil pan and windage tray, which are optimized for higher acceleration being tested to withstand forces of up to 1.8 G.

The complete engine kit includes the bigger supercharger with throttle body, fuel injectors, coil packs, water pump, front sump oil pan, and flexplate.

For those that wish to bundle this awesome powerplant with a manual transmission, Mopar offers the flywheel, clutch, and pressure plate assembly and connecting screws as separate parts, which can be found in their catalog.

There is also a Front-End Accessory Drive (FEAD) Kit that includes an alternator, power-steering pump, belts, pulleys, and mounting hardware.

The Hellcrate Redeye 6.2-liter Supercharged HEMI V8 engine is marketed as a solution for pre-1976 street and off-road vehicles and it's available to order for a price of $21,807 (MSRP).
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About the author: Vlad Radu
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Vlad's first car was custom coach built: an exotic he made out of wood, cardboard and a borrowed steering wheel at the age of five. Combining his previous experience in writing and car dealership years, his articles focus in depth on special cars of past and present times.
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