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Bentley 4½ Litre: The classic sports car of the W. O. Bentley era
The Bentley 4½ Litre is one of the most iconic pre-war Bentleys, produced from 1927 to 1931 by the company led by W. O. Bentley. It's a collector's car, so we'll delve into its history, technology, and what you need to know before buying.
4½ Litre in brief
The 4½ Litre was a larger and more powerful sibling to the 3 Litre. Its name comes from the 4.4-litre four-cylinder engine. The car was built on a separate chassis, with bodies crafted by independent coachbuilders, so appearances can vary greatly.
This model is famous for its sporting history – Bentleys of the 1920s successfully competed in the Le Mans races. As a result, the 4½ Litre is still considered one of the most iconic classic Bentleys.
Which version to choose
The main variant is the naturally aspirated 4½ Litre. This is the classic car with more practical value, as its technology is simpler than that of the supercharged version.
A separate, highly prized version is the 'Blower' with a supercharger, produced in small numbers. Today, there are many later replicas and conversions, so it's crucial for buyers to check if the car is genuinely original.
Engine and gearbox
The engine is a 4.4-litre four-cylinder, with an overhead camshaft and four valves per cylinder. It was a very advanced design for its time.
The gearbox is a four-speed manual, without synchromesh, so changing gears requires some skill. The brakes are drum brakes, so you need to allow for a longer stopping distance when driving.
What to check when buying a 4½ Litre
The most important thing is provenance and authenticity. Check the chassis and engine numbers, historical documents, whether the body is original or a later conversion. Many cars were modified over the decades.
It's essential to check the condition of the engine and gearbox, chassis, suspension, and braking system. Repairs require specialist knowledge and can be very expensive.
Buy only from reputable specialist dealers and consult a classic Bentley expert.
Trim levels
Names and equipment vary by market and year; we list the versions most commonly found in Europe.
4½ Litre
1927–1931The standard, naturally aspirated version.
- 4.4-litre four-cylinder engine
- Separate chassis
- Bodies from various coachbuilders
Blower
1929–1930Supercharged version, produced in small numbers.
- Supercharger on the engine
- More power
- Highly prized by collectors
Comparing versions
| 4½ Litre | Blower | |
|---|---|---|
| Who it's for | For classic racing enthusiasts | For serious collectors |
| Engine | 4.4-litre naturally aspirated | 4.4-litre with supercharger |
| Rarity | Rare | Very rare |
| Price in the used market (relatively) | €€€ | €€€ |
This isn't a daily driver, but a collector's car. Choose one whose authenticity is backed by documents.
Pros
- Significant historical importance
- A robust, advanced design for its time
- Distinctive sporting character
- High collectible value
Cons
- Very expensive to buy and maintain
- Requires specialist upkeep
- Many later modifications — authenticity is hard to assess
Frequently asked questions
How much engine capacity does the 4½ Litre have?
The engine capacity is around 4.4 litres (four cylinders), but the name is “4½”
What is a Blower?
It’s the 4½ Litre version with a supercharger, produced in small numbers and highly prized by collectors
How to check if the car is original?
Check the engine and chassis numbers, historical documents, and consult a classic Bentley expert
Updated 2026-10-21 · Trim levels and equipment vary by market and model year — check the equipment of the specific car. · Translated automatically
