Chevrolet Gemini small-block engine

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Gemini small-block engine
File:2023 Chevrolet LT6 engine, NYIAS 2022.jpg
Overview
Manufacturer General Motors (Chevrolet)
Production 2022–present
Combustion chamber
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 alloy
Cylinder head alloy Aluminum
Valvetrain DOHC 4 valves
Compression ratio 12.5:1
Combustion
Fuel system Direct fuel injection
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 April 2023, the Gemini engine has only one variant, dubbed LT6. Hagerty, an American insurance company, reported in 2020 that a successor, the LT7, is expected to arrive in the 2024 model year.[6]

LT6

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 C8.R since 2019, and many features in the racing engine carry over to the road engine.[2] Other notable LT6 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

See also

References

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