Gemini small-block engine | |
---|---|
![]() | |
Overview | |
Manufacturer | General Motors (Chevrolet) |
Production | 2022–present |
Layout | |
Configuration | 90° V8 |
Displacement | 5,463 cc (333.4 cu in) |
Cylinder bore | 104.25 mm (4.104 in) |
Piston stroke | 80 mm (3.1 in) |
Cylinder block material | Sand-cast A319 Aluminum |
Cylinder head material | Aluminum |
Valvetrain | DOHC 4 valves |
Compression ratio |
|
RPM range | |
Max. engine speed | 8,600 RPM (soft), 9,000 RPM (hard) |
Combustion | |
Turbocharger | Twin-turbo (LT7) |
Fuel system |
|
Management | GM E68 (32-bit) |
Fuel type | Gasoline |
Oil system | Dry sump |
Cooling system | Water-cooled |
The Chevrolet Gemini small-block engine is a dual-overhead cam (DOHC) V8 engine designed by General Motors. While technically a small-block engine because of its bore spacing of 4.4 inches, [1] [2] General Motors engineers do not consider it to be a part of the traditional Chevrolet small block lineage because of the substantial reworking, specialized development, and unique technical features distinguishing its design. [3] [4] [5]
The LT6 is a clean-sheet design, mechanically unrelated to both the LS-based engines and the Cadillac Blackwing V8. Its most notable traits include a flat-plane crankshaft and dual-overhead camshafts, which represents a departure from the traditional pushrod valves and crossplane crankshafts found in all previous generations of Chevrolet small-block engines. As of May 2024, the Gemini engine has only one variant, dubbed LT6. Hagerty , an American insurance company, reported in 2020 that a higher horsepower variant, the LT7, is expected to arrive in the 2024 model year. [6]
The LT6 is a 5.5-liter, naturally-aspirated V8 engine. It debuted in the eighth-generation Corvette Z06, and was unveiled on October 26, 2021. [1]
While the LT6 features a redline of 8,600 RPM, it generates a maximum of 670 hp (500 kW; 679 PS) at 8,400 RPM and 460 lb⋅ft (624 N⋅m) of torque at 6,300 RPM. These figures make it the most powerful naturally-aspirated production V8 engine of all time; the engine to previously hold this title, the Mercedes-Benz SLS AMG Black Series M159 6.2-liter V8, made 622 hp (464 kW; 631 PS) at 7,400 RPM. [7] [8] [1]
The LT6 is also the largest flat-plane V8 used in a production car by displacement, dethroning the Ford Voodoo. This is notable due to the additional vibrations inherent to this architecture compared to a crossplane V8, which tend to scale up with displacement. [9]
A modified version of the LT6 has powered the Chevrolet Corvette C8.R since 2019, and many features in the racing engine carry over to the road engine. [2] Other notable features include a cast aluminum block, dual coil valve springs supporting titanium intake & sodium filled exhaust valves, forged aluminum pistons, forged titanium connecting rods, active split intake manifold with twin 87mm throttle bodies, four-into-two-into-one stainless steel exhaust headers, and a factory six-stage 10-quart dry sump oiling system with individual crank bay scavenging. [1]
Applications:
Year(s) | Model | Power | Torque | Dyno Chart |
---|---|---|---|---|
2023–present | Chevrolet Corvette Z06 | 670 hp (500 kW) @ 8400 rpm | 460 lb⋅ft (624 N⋅m) @ 6300 rpm | link |
The LT7 is a twin-turbocharged variant of the LT6 which debuted in the eighth-generation Corvette ZR1 and was unveiled on July 25, 2024. The LT7 has a redline of 8,000 RPM, generating 1,064 hp (793 kW; 1,079 PS) at 7,000 RPM and 828 lb⋅ft (1,123 N⋅m) of torque at 6,000 RPM.
The LT7 has stronger pistons and connecting rods, lowering the compression ratio from 12.5:1 to 9.8:1. Unlike the LT6, the LT7 uses both direct fuel injection and port injection, with a total of 16 injectors. The turbochargers produce up to 20 psi (1.4 bar) in normal operating conditions and a maximum of 24 psi (1.7 bar) under high temperatures. Other features specific to the LT7 include turbo-integrated exhaust manifolds, water-to-air intercoolers, and an electrically actuated wastegate. [10] [11]
Applications:
Year(s) | Model | Power | Torque |
---|---|---|---|
2025–present | Chevrolet Corvette ZR1 | 1,064 hp (793 kW) @ 7000 rpm | 828 lb⋅ft (1,123 N⋅m) @ 6000 rpm |
The Chevrolet Corvette is a line of American two-door, two-seater sports cars manufactured and marketed by General Motors under the Chevrolet marque since 1953.
The General Motors LS-based small-block engines are a family of V8 and V6 engines designed and manufactured by American automotive company General Motors. First introduced in 1997, the family is a continuation of the earlier first- and second-generation Chevrolet small-block engine, of which over 100 million have been produced altogether, and is also considered to be one of the most popular V8 engines ever. Spanning three generations, a new, sixth generation is expected to enter production soon. Various small-block V8s were and still are available as crate engines.
The Chevrolet "big-block" engine is a term for a series of large-displacement, naturally-aspirated, 90°, overhead valve, gasoline-powered, V8 engines; that were developed and produced by the Chevrolet Division of General Motors, from the 1950s until present.
The Chevrolet small-block engine is a series of gasoline-powered V8 automobile engines, produced by the Chevrolet division of General Motors between 1954 and 2003, using the same basic engine block. Referred to as a "small-block" for its size relative to the physically much larger Chevrolet big-block engines, the small-block family spanned from 262 cu in (4.3 L) to 400 cu in (6.6 L) in displacement. Engineer Ed Cole is credited with leading the design for this engine. The engine block and cylinder heads were cast at Saginaw Metal Casting Operations in Saginaw, Michigan.
The Buick V6 is an OHV V6 engine developed by the Buick division of General Motors and first introduced in 1962. The engine was originally 198 cu in (3.2 L) and was marketed as the Fireball engine. GM continued to develop and refine the 3.8 L (230 cu in) V6, eventually and commonly referred to simply as the 3800, through numerous iterations.
The Oldsmobile V8, also referred to as the Rocket, is a series of engines that was produced by Oldsmobile from 1949 until 1990. The Rocket, along with the 1949 Cadillac V8, were the first post-war OHV crossflow cylinder head V8 engines produced by General Motors. Like all other GM divisions, Olds continued building its own V8 engine family for decades, adopting the corporate Chevrolet 350 small-block and Cadillac Northstar engine only in the 1990s. All Oldsmobile V8s were assembled at plants in Lansing, Michigan while the engine block and cylinder heads were cast at Saginaw Metal Casting Operations.
The term Cadillac V8 may refer to any of a number of V8 engines produced by the Cadillac division of General Motors since it pioneered the first such mass-produced engine in 1914.
The flat-plane crank is a type of crankshaft for use in internal combustion engines that has a 180-degree angle between crank throws.
The Chevrolet Corvette (C6) is the sixth generation of the Corvette sports car that was produced by Chevrolet division of General Motors for the 2005 to 2013 model years. It is the first Corvette with exposed headlamps since the 1962 model. Production variants include the Z06, ZR1, Grand Sport, and 427 Convertible. Racing variants include the C6.R, an American Le Mans Series GT1 championship and 24 Hours of Le Mans GTE-Pro winner.
The Chevrolet Corvette (C5) is the fifth generation of the Corvette sports car, produced by the Chevrolet division of General Motors for the 1997 through 2004 model years. Production variants include the high performance Z06. Racing variants include the C5-R, a 24 Hours of Daytona and 24 Hours of Le Mans GTS/GT1 winner. The C5 Corvette was the first GM vehicle to feature the third generation small block "LS" engines. Pop-up headlights were featured on a Corvette for the final time during this generation.
The Chevrolet Corvette (C2) is the second generation of the Corvette sports car, produced by the Chevrolet division of General Motors (GM) for the 1963 through 1967 model years.
The Chevrolet Corvette (C3) is the third generation of the Corvette sports car that was produced from 1967 until 1982 by Chevrolet for the 1968 to 1982 model years. Engines and chassis components were mostly carried over from the previous generation, but the body and interior were new. It set new sales records with 53,807 produced for the 1979 model year. The C3 is the third generation of the Chevrolet Corvette, and marks the second time the Corvette would carry the Stingray name, though only for the 1969–76 model years. This time it was a single word as opposed to Sting Ray as used for the 1963–67 C2 generation. The name would then be retired until 2014 when it returned with the release of the C7.
The Chevrolet Corvette (C4) is the fourth generation of the Corvette sports car, produced by American automobile manufacturer Chevrolet from 1983 until 1996. The convertible returned, as did higher performance engines, exemplified by the 375 hp (280 kW) LT5 found in the ZR-1. In early March 1990, the ZR-1 would set a new record for the highest 24 hour-5,000 mile land-speed by going over a speed of 175 mph (282 km/h). With a completely new chassis, modern sleeker styling, and other improvements to the model, prices rose and sales declined. The last C4 was produced on June 20, 1996.
Callaway Cars Inc. is an American specialty vehicle manufacturer and engineering company that designs, develops, and manufactures high-performance product packages for cars, pickup trucks, and SUVs. They specialize in Corvettes and GM vehicles. New GM vehicles are delivered to Callaway facilities where these special packages and components are installed. Then the vehicles are delivered to GM new car dealers where they are sold to retail customers, branded as Callaway. Callaway Cars is one of four core Callaway companies, including Callaway Engineering, Callaway Carbon and Callaway Competition.
A V8 engine is an eight-cylinder piston engine in which two banks of four cylinders share a common crankshaft and are arranged in a V configuration.
The F136, commonly known as Ferrari-Maserati engine, is a family of 90° V8 petrol engines jointly developed by Ferrari and Maserati and produced by Ferrari; these engines displace between 4.2 L and 4.7 L, and produce between 390 PS and 605 PS. All engines are naturally aspirated, incorporate dual overhead camshafts, variable valve timing, and four valves per cylinder.
The Chevrolet Corvette (C7) is the seventh generation of the Corvette sports car manufactured by American automobile manufacturer Chevrolet from 2014 until 2019. The first C7 Corvettes were delivered in the third quarter of 2013. The racing variants include the C7.R, which won the GTLM 24 Hours of Le Mans.
The LT-1 is a Chevrolet small-block engine produced by the Chevrolet division of General Motors between 1970 and 1972. It was available exclusively in the Corvette and Camaro and was produced in relatively small quantities. It is regarded today as one of the greatest of the Chevrolet small-blocks, an engine that has been in production since 1955.
The Chevrolet Corvette (C8) is the eighth generation of the Corvette sports car manufactured by American automobile manufacturer Chevrolet. It is the first rear mid-engine Corvette since the model's introduction in 1953, differing from the traditional front mid-engine design started in 1963. The C8 was announced in April 2019, and the coupe made its official debut on July 18, 2019, in Tustin, California. The convertible made its debut in October 2019 during a media event at the Kennedy Space Center to coincide with the 50th anniversary of the Apollo 11 mission. Production officially began on February 3, 2020, delayed by the 2019 General Motors strike.
The Chevrolet Indy V8 engine is a 3.0-liter and 3.5-liter, naturally-aspirated, V-8 racing engine developed and produced by Chevrolet, for use in the IRL IndyCar Series; from 2002 to 2005.