Cadillac twin-turbo V8

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Cadillac Blackwing V8
Overview
ManufacturerCadillac
Also calledLTA
Blackwing
Production2018–2020
Layout
Configuration90° V8
Displacement4.2 L; 255.8 cu in (4,192 cc)
Cylinder bore86 mm (3.39 in)
Piston stroke90.2 mm (3.55 in)
Block materialAluminum
Head materialAluminum
ValvetrainDOHC 4 valves x cyl.
Compression ratio9.8:1
Combustion
Turbochargerhot-V twin scroll Twin-turbos with intercoolers
Fuel systemDirect injection
Fuel typeGasoline
Cooling systemWater-cooled
Output
Power output500–550 hp (373–410 kW)
Specific power131.2 hp (97.8 kW) per liter
Torque output574–640 lb⋅ft (778–868 N⋅m)
Chronology
PredecessorCadillac Northstar engine

The Cadillac Blackwing V8 (GM RPO LTA) is a twin-turbo DOHC V8 engine that was produced by the Cadillac Division of General Motors for use in its CT6-V between 2018 and early 2020. It is a clean sheet engine design, as well as the Division's first ever twin-turbo V8 engine. The engine was branded as the "Blackwing V8" by GM technicians, and is the first Cadillac-exclusive dual overhead cam V8 engine since the Northstar V8 was dropped in 2011.[1]

The aluminum cylinder block features pressed-in iron liners, cross-bolted main bearing caps and houses a lightweight forged steel crankshaft, forged steel connecting rods and high strength hypereutectic aluminum pistons. There are four sodium-filled valves per cylinder.

The intercooled turbochargers are mounted between the cylinder banks in a so-called hot-V configuration and their twin scroll design broadens their performance capability, offering quicker response and greater efficiency. These produce up to 20 psi (1.4 bar) and are matched with electronic wastegate control for more precise boost management and more responsive torque production. Ninety percent of the engine's peak torque is available at 2000 rpm and carried through 5200 rpm.

Other features include direct fuel injection camshaft phasing, variable displacement/start-stop cylinder deactivation, and variable-pressure oiling system with piston-cooling oil jets.

All versions were to come equipped with the Ford 10L90 10-speed automatic transmission and Cadillac's all-wheel drive system.[citation needed]

In spite of its power and sophistication, high cost to produce the engine and low demand for the CT6-V led to its cancellation in early 2020, before it could be expanded to Cadillac's Escalade line.

Production[]

When Cadillac introduced the new CT6-V in March 2018, the production was limited to 275 units for the US market. The entire allocations were sold out in minutes as soon as the pre-order book was opened in January 2019.[2] Cadillac did not anticipate the strong demand and introduced the second CT6 model with detuned Blackwing engine: CT6 4.2 Platinum, which sold out quickly as well.[3]

Cancellation[]

Cadillac intended for the Blackwing V8 engine to be exclusive for its flagship sedan, CT6, and stillborn larger sedan, Escala.[4] However, the CT6 was a poor seller during its entire model run and was cancelled on February 2020. With estimated production cost of $20,000 per engine, the Blackwing V8 would be too expensive for Escalade when somewhat over half the performance is available from GM's 3.0-litre twin turbocharged LGW High Feature V6 engine.

Versions[]

Engine
Years Model Power Torque
2019 Cadillac CT6 4.2 Platinum 500 hp (373 kW) @ 5,700 rpm 574 lb⋅ft (778 N⋅m) @ 3,200-4,000 rpm
Cadillac CT6-V 550 hp (410 kW) @ 5,700 rpm 640 lb⋅ft (868 N⋅m) @ 3,200-4,000 rpm

See also[]

References[]

  1. ^ Brzozowski, Aaron (20 September 2018). "What's A Northstar? New Twin-Turbo Cadillac V8 Named 'Blackwing'". GM Authority.
  2. ^ Luft, Alex (23 January 2019). "2019 Cadillac CT6-V Preorders Sell Out Within Minutes". Cadillac Society.
  3. ^ Traugott, Jay (21 February 2019). "Missed Out On A 550-HP CT6-V? Cadillac Has A Solution". Car Buzz.
  4. ^ Perkins, Chris (16 June 2020). "Why Cadillac Killed Its Landmark Blackwing V-8 Engine". Road & Track.
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