01
Rolls-Royce Ghost
Generation/Chassis
Series II (RR5/6)
Badge(s)
Ghost, Ghost Extended
Years
2018-present
Rolls-Royce N74B66A Engine - Replacement Cost, Problems & CompatibilityProblems & Compatibility
The 6.6-litre twin-turbo V12 fitted to the latest generation Rolls-Royce Ghost. Reconditioned units start from £12,000 , serving as the definitive, high-torque powerplant for ultra-luxury propulsion.
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
Used from
£8,000
Reconditioned from
£12,000
Rebuilt from
£18,000
GB
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Quotes only from vetted UK engine specialists.
Key Specs
Rolls-Royce N74B66A - Specifications at a Glance
Engine Code
N74B66A
Fuel
Petrol
Configuration
6.6L V12, twin-turbocharged
Power Output(s)
563hp - 624hp (depending on Ghost / Black Badge tune)
Years Produced
2018-present
UK Models Fitted
1 Rolls-Royce model family - full list in Compatibility below
Replaced
N74B60
Replaced By
-
Most Common Failure
Turbocharger coolant line leaks and valve stem seal wear
Reconditioned Price Range
£12,000-£20,000 supply-only
Vetted UK specialists for N74B66A replacements
Minimum 12-month warranty on reconditioned and rebuilt options
Fitted To
Which Rolls-Royce Models Use the N74B66A-
The N74B66A is exclusively fitted to the latest generation of Rolls-Royce motor cars, primarily serving as the definitive, ultra-smooth powerplant for the Ghost and Ghost Extended platforms.
| Model | Generation/Chassis | Badge(s) | Years | Link |
|---|---|---|---|---|
 Rolls-Royce Ghost | Series II (RR5/6) | Ghost, Ghost Extended | 2018-present |
CROSS-BRAND
N74B66A is documented across 1 BMW applications spanning Rolls-Royce Ghost. Registration lookup confirms the exact suffix before quotes are sent.
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Not sure which engine your car has- Enter your registration above - we'll confirm your exact N74B66A fitment before any quotes are sent.
Prices
Rolls-Royce N74B66A Engine Replacement Cost (UK)
Condition | Supply Only | Fitted (Independent Specialist) | Typical Warranty |
|---|---|---|---|
Used | £8,000-£15,000 | £10,000-£19,500 | 3-6 months |
Reconditioned | £12,000-£20,000 | £14,000-£24,500 | 12-24 months |
Rebuilt | £18,000-£30,000 | £20,000-£34,500 | 12-24 months |
The final N74B66A engine cost depends heavily on whether the high-pressure fuel pumps (HPFP), turbochargers, and the known turbo coolant line upgrades have been recently addressed. Units with documented preventative maintenance command a premium but offer significantly lower long-term risk. For a full breakdown of how these factors impact your quote, see our full reconditioned engine cost guide .
Labour Guide
Fitting an N74B66A typically takes 20-30 hours at £100-£150/hr (Rolls-Royce specialist) - confirm exact labour when comparing quotes.
Price Factors
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Common Problems
Rolls-Royce N74B66A Engine Problems - What Actually Fails
Every engine has its weak points. Here are the known issues with the N74B66A, based on real-world data and verified failure patterns.
Verified issue focus: Turbocharger coolant line leaks and valve stem seal wear.
1. Turbocharger Coolant Line Leaks - 2018-present models
1. Turbocharger Coolant Line Leaks - 2018-present models
Typical onset:
40,000-80,000 miles
What happens:
The N74's "hot-vee" V12 design places the twin turbochargers inside the V of the engine, subjecting the coolant lines to extreme, sustained heat. Over time, the factory plastic and rubber fittings become brittle and leak, leading to gradual coolant loss and potential overheating if ignored.
Repair vs replace:
Upgraded metal coolant lines are a routine preventative fix (£1,500-£3,000). However, if the leak is ignored and the N74B66A overheats, it can warp the cylinder heads, making a full engine replacement the only viable option.
Read more about this issue
2. Valve Stem Seal Wear and Oil Consumption - All variants
2. Valve Stem Seal Wear and Oil Consumption - All variants
Typical onset:
60,000-100,000 miles
What happens:
High heat and mileage cause the valve stem seals to harden and lose elasticity. This allows oil to seep down the valve guides into the combustion chambers, resulting in blue smoke on cold startup and increased oil consumption between services.
Repair vs replace:
A standalone valve stem seal replacement is highly labour-intensive due to the complex V12 layout (£4,000-£8,000). If left unchecked, it can foul spark plugs and damage the expensive catalytic converters, making a reconditioned N74B66A the more economical long-term choice.
Read more about this issue
The N74B66A benefits from revised cooling system routing and updated turbo components compared to earlier N74 iterations, though the fundamental hot-vee thermal stress remains a factor requiring strict, dealer-level maintenance .
Compare rebuilt N74B66A prices with the failure already addressed
Engine Variants
How to Confirm You Have the N74B66A
The N74B66A engine code is stamped directly onto the engine block, typically visible under the main acoustic engine cover or listed on the vehicle's VIN plate and build sheet. It is most commonly confused with the closely related N74B60 (the earlier 6.6L variant) or the base N74B66 family code. Fitting the wrong revision will result in immediate ECU mapping mismatches, incorrect twin-turbo plumbing, and loom incompatibility, making precise identification critical before purchasing a replacement. Not 100% sure- Enter your registration above, and our system will instantly confirm your exact N74B66A fitment before any quotes are sent.
Easily Confused
N74B60
- The earlier 6.0-litre twin-turbo V12 found in the Phantom and early Ghost; the N74B66A increased displacement to 6.6L for greater torque and smoother power delivery.
Alternative / Next-Gen Code
The N74B66A remains in current production across Rolls-Royce's flagship V12 lineup, so no direct successor exists yet.
Confirm the exact N74B66A fitment
Buying Guide
Buying a Replacement N74B66A - What to Choose
Choosing the right replacement route depends on your budget, risk tolerance, and ownership goals. Here's a breakdown of your options.
Used:
A used N74B66A is only advisable if it comes with a comprehensive, stamped Rolls-Royce service history proving the turbo coolant lines were upgraded to metal and the valve stem seals have been recently inspected. Without this, you risk inheriting the V12's most common thermal failure points. Learn more about used engines .
Reconditioned:
A proper reconditioned N74B66A is the most balanced choice for long-term ownership. A reputable rebuild will replace the vulnerable turbo coolant lines with metal upgrades, install new valve stem seals, and refresh the high-pressure fuel system, effectively resetting the engine's reliability clock. Explore reconditioned options .
Rebuilt:
A full rebuild is justified for high-mileage or Black Badge examples intended for long-term retention. An upgraded rebuild should include reinforced cooling components, updated HPFPs, and a thorough bench-testing of the twin-turbo setup to ensure longevity. View rebuilt engine services .
Supply & Fit Line:
Sourcing and fitting through our vetted network ensures your N74B66A is installed by Rolls-Royce-trained specialists familiar with its complex hot-vee architecture, backed by a minimum 12-month nationwide warranty. Check supply and fit options .
Vehicle Value Note:
The N74B66A is exclusively found in the Rolls-Royce Ghost, which generally retains values between £150,000 and £300,000+ depending on specification, provenance, and mileage. Given these exceptionally high host values, a reconditioned or rebuilt N74B66A replacement is almost always the correct financial decision over scrapping, preserving the vehicle's market value and collector appeal.
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Related Engines
Engines Related to the Rolls-Royce N74B66A
Explore engines that are closely related to the Rolls-Royce N74B66A, including its predecessor, successor, and key family variants.
Predecessor
N74B60
- The earlier 6.0-litre twin-turbo V12 found in the Phantom and early Ghost; the N74B66A increased displacement to 6.6L for greater torque and smoother power delivery.
Successor
The N74B66A remains in current production across Rolls-Royce's flagship V12 lineup, so no direct successor exists yet.
FAQ
Rolls-Royce N74B66AFrequently Asked Questions
Question 1How much does a Rolls-Royce N74B66A engine replacement cost-
Reconditioned N74B66A units start from £12,000 supply-only, with fully fitted costs typically ranging from £14,000 to £24,500. Prices vary based on whether the turbo coolant lines and valve stem seals are included in the rebuild. Labour typically adds 20-30 hours at Rolls-Royce specialist rates.
- Prices vary based on whether the turbo coolant lines and valve stem seals are included in the rebuild.
- Labour typically adds 20-30 hours at Rolls-Royce specialist rates.
Question 2What is the most common failure with the N74B66A-
The most documented failure is turbocharger coolant line leaks, typically appearing between 40,000 and 80,000 miles. The hot-vee V12 design places the twin turbos inside the engine's V, subjecting coolant lines to extreme, sustained heat. Factory plastic and rubber fittings become brittle over time, leading to gradual coolant loss and potential overheating.
- The hot-vee V12 design places the twin turbos inside the engine's V, subjecting coolant lines to extreme, sustained heat.
- Factory plastic and rubber fittings become brittle over time, leading to gradual coolant loss and potential overheating.
Question 3Which Rolls-Royce models use the N74B66A engine-
The N74B66A was fitted to the Rolls-Royce Ghost Series II and Ghost Extended between 2018 and the present. It serves as the flagship 6.6-litre twin-turbo V12 across the entire Ghost model range. Always verify your specific chassis code, as fitment varies by production year.
- It serves as the flagship 6.6-litre twin-turbo V12 across the entire Ghost model range.
- Always verify your specific chassis code, as fitment varies by production year.
Question 4Should I buy a used or reconditioned N74B66A-
A reconditioned N74B66A is strongly recommended over a used unit for long-term reliability. A proper rebuild will replace the vulnerable turbo coolant lines with metal upgrades, install new valve stem seals, and refresh the high-pressure fuel system. Used units carry a high risk of inheriting thermal failures without comprehensive, stamped Rolls-Royce service history.
- A proper rebuild will replace the vulnerable turbo coolant lines with metal upgrades, install new valve stem seals, and refresh the high-pressure fuel system.
- Used units carry a high risk of inheriting thermal failures without comprehensive, stamped Rolls-Royce service history.
Question 5How do I know if my car has the N74B66A-
The engine code is stamped on a machined pad on the engine block, typically visible under the main acoustic engine cover, or listed on the vehicle's VIN plate and build sheet. It is most commonly confused with the closely related N74B60 (6.0L) or the N74B66B (Cullinan/Phantom variant). Fitting the wrong revision will result in ECU mapping mismatches and incorrect twin-turbo plumbing.
- It is most commonly confused with the closely related N74B60 (6.0L) or the N74B66B (Cullinan/Phantom variant).
- Fitting the wrong revision will result in ECU mapping mismatches and incorrect twin-turbo plumbing.
Compare Rolls-Royce N74B66A Engine Prices Today
Get a free, no-obligation comparison tailored to your exact N74B66A sub-code and vehicle. Our registration lookup confirms your precise fitment before any quotes are sent, ensuring you receive accurate, compatible pricing. With reconditioned N74B66A units starting from £12,000, comparing takes two minutes and could save you thousands on your replacement.
Vetted UK Specialists
Vetted UK specialists for N74B66A replacements
Minimum 12-Month Warranty
Minimum 12-month warranty on reconditioned and rebuilt options
Nationwide Delivery
Nationwide delivery plus supply and fit availability
Expert Support
Secure enquiry - no spam. Quotes only from vetted UK engine specialists.
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