Cadillac twin-turbo V8
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]
| Cadillac Blackwing V8 | |
|---|---|
| Overview | |
| Manufacturer | Cadillac |
| Also called | LTA Blackwing |
| Production | 2018–2020 |
| Layout | |
| Configuration | 90° V8 |
| Displacement | 4.2 L; 255.8 cu in (4,192 cc) |
| Cylinder bore | 86 mm (3.39 in) |
| Piston stroke | 90.2 mm (3.55 in) |
| Cylinder block material | Aluminum |
| Cylinder head material | Aluminum |
| Valvetrain | DOHC 4 valves x cyl. |
| Compression ratio | 9.8:1 |
| Combustion | |
| Turbocharger | hot-V twin scroll Twin-turbos with intercoolers |
| Fuel system | Direct injection |
| Fuel type | Gasoline |
| Cooling system | Water-cooled |
| Output | |
| Power output | 500–550 hp (373–410 kW) |
| Specific power | 131.2 hp (97.8 kW) per liter |
| Torque output | 574–640 lb⋅ft (778–868 N⋅m) |
| Chronology | |
| Predecessor | Cadillac Northstar engine |
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 GM 10L90 10-speed automatic transmission and Cadillac's all-wheel drive system.
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 cancelled larger sedan, Escala/CT8.[4][5] However, the CT6 was a poor seller during its entire model run and was cancelled in 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.
In March 2020, Manifattura Automobili Torino announced that they would continue production and development of the Blackwing engine, in collaboration with Punch Torino.[6] This was however promptly denied by GM.[7] As of January 2022, the Blackwing was still available on Cadillac's parts website, however a spokesman for GM confirmed that they were not building any more of them.[8]
Versions
| Years | Model | Power | Torque |
|---|---|---|---|
| 2019 & 2020 | 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
- Brzozowski, Aaron (20 September 2018). "What's A Northstar? New Twin-Turbo Cadillac V8 Named 'Blackwing'". GM Authority.
- Luft, Alex (23 January 2019). "2019 Cadillac CT6-V Preorders Sell Out Within Minutes". Cadillac Society.
- Traugott, Jay (21 February 2019). "Missed Out On A 550-HP CT6-V? Cadillac Has A Solution". Car Buzz.
- Perkins, Chris (16 June 2020). "Why Cadillac Killed Its Landmark Blackwing V-8 Engine". Road & Track.
- SZYMKOWSKI, SEAN. "Breaking: Cadillac Reportedly Cancels Flagship CT8 Program". GM Authority. Retrieved 4 June 2023.
- Petrány, Máté (6 March 2020). "Cadillac's orphaned Blackwing V-8 will be used by Manifattura Automobili Torino". Hagerty.
- Petrány, Máté (9 March 2020). "GM responds: MAT's Blackwing V-8 deal is up in the air for now". Hagerty.
- Holderith, Peter (27 January 2022). "You Can Still Buy a Twin-Turbo Cadillac Blackwing V8 Engine From GM… For Now". The Drive.