Chrysler Thunderbolt engine (Guminator1A)

The Chrysler Thunderbolt engine family is a series of aluminum (die-cast cylinder block) dual overhead cam 32-valve gasoline V8 engines announced during the 2019 model year for use in future Chrysler, Dodge, and Ram vehicles. The engine was initially named "Hurricane," but the name was changed before the official launch at the 2019 Frankfurt International Motor Show so that it would not be confused with Stellantis' Later Hurricane I6 engine.

4.8 L Chrysler Thunderbolt MBVV V8
At the 2019 Frankfurt International Motor Show, the 4.8 L Chrysler Thunderbolt MBVV V8 was unveiled as part of the Project Antlion partnership. It incorporated many of the traits of the Chrysler Pentastar V6, including the aluminum cylinder heads and 4 valves per cylinder DOHC design, but differed with a new intake manifold and intercooler modeled after aftermarket Pentastarch V6 intake manifold and intercooler designs, a drastic change in the airflow efficiency of the heads, new valvetrain, and a cross-plane crankshaft. A 4.8L sister engine called the Thunderbolt MBVV was also hinted at as an engine option in the Chrysler Edson concept minivan upon the latter's second announcement later that year.

The Thunderbolt V8 shared many characteristics with the Chrysler Pentastar V6, such as aluminum cylinder heads and a 4 valves per cylinder DOHC design, but it also had a cross-plane crankshaft. However, apart from the addition of two more cylinders, it also differed greatly from the regular Pentastar V6 by using a different intake manifold and intercooler based on aftermarket intake manifold and intercooler designs. When Chrysler made its second announcement about the Edson concept minivan later that year, a 4.8L sister engine known as the Thunderbolt MBVI was also mentioned as a potential engine choice alongside the Thunderbolt MBVV.

Additionally, in the fictitious Ram 1480 light pickup based on the hypothetical Ram ST platform, the engine would also be offered as a choice alongside the Thunderbolt MBVI V8. In particular, the MBVV V8 in the RAM 1480 would be de-tuned to 305 hp (227 kW) from it's maximum tune of 435 hp (325 kW).

Bore and stroke were the same as the 3.6L variant of the Pentastar V6, measuring 96 mm and 83 mm (3.78 and 3.27 in), respectively. Insiders also initially claimed that the engine will be available in four basic sizes and several different tuning levels. The engines also shared additional characteristics. Notably, the Thunderbolt V8 and Pentastar V6 engines both have a 60° V angle and can run on E85 or 87 octane fuel. Because V8s are generally 90°, the 60° angle of the 4.8L Thunderbolt V8 makes it more compact and more appropriate for transverse mounting, However it is not perfectly balanced, necessitating the use of a counter-rotating balance shaft.

Similarly, potential direct injection, forced induction, and cylinder deactivation options were also inherited from the Pentastar engine design, but were not implemented completely as the 4.8 L Thunderbolt MBVV V8 has yet to see production.

4.8 L Chrysler Thunderbolt MBVI V8
The 4.8 L Chrysler Thunderbolt MBVI V8 was also teased at the 2019 Frankfurt International Motor Show. It was in many ways similar to the 4.8 L Thunderbolt MBVO V8, but it differed with a pushrod valve configuration and a flat plane crankshaft. Also instead of an entirely different intercooler and intake manifold, this version instead used modified variants of the stock 3.6L Pentastar intake manifold and intercooler.

Because the engine uses overhead valves actuated by pushrods, it is significantly smaller than the overhead camshaft Hemi engines.

Bore and stroke were also identical to the Pentastar V6, specifically the 3.6L variant, at 96 mm and 83 mm (3.78 and 3.27 in), respectively. Like previously mentioned, insiders had initially reported that the 4.8 L Chrysler Thunderbolt MBVI was to also be an engine option in the Chrysler Edson concept minivan. However, it would also see usage in the hypothetical Ram 1460 light pickup based on the Chrysler LD platform as well as in the hypothetical Ram 1480 light pickup based on the Ram ST platform. The difference is that the variant of the MBVI in the 1460 would be de-tuned to 230 hp (172 kW) from it's maximum tune of 275 hp (205 kW), whilst the MBVI in the 1480 would be rated at 275 hp (205 kW).