Pre-War Engine Specialists
Derby Bentley and Rolls-Royce Engines from 1904 to 1940
Over 75 years combined experience in rebuilding and maintaining these magnificent engines
Derby Bentley 3½L
The Derby Bentley 3½ litre engine represents a pinnacle of pre-war British engineering. With its inline 6-cylinder configuration and overhead valve design, this engine delivered refined power and exceptional reliability. We specialize in complete rebuilds, maintaining original specifications while ensuring modern reliability.
Engine Specifications
- Inline 6-cylinder
- Overhead valve
- 3,669 cc displacement
- Approximately 110 bhp
Derby Bentley 4¼L
The larger 4¼ litre Derby Bentley engine offered increased torque and power, making it ideal for the heavier coachwork of the era. This engine is renowned for its smooth operation and durability. Our team has extensive experience in restoring these magnificent engines to their original glory.
Engine Specifications
- Inline 6-cylinder
- Overhead valve
- 4,257 cc displacement
- Approximately 125 bhp
Rolls-Royce 20hp
The Rolls-Royce 20hp engine was designed as a smaller, more manageable alternative to the larger Silver Ghost. Despite its modest designation, this 6-cylinder engine delivered exceptional smoothness and reliability. We maintain these engines with the precision and care they deserve.
Engine Specifications
- Inline 6-cylinder
- Overhead valve
- 3,127 cc displacement
- Approximately 50 bhp
Rolls-Royce 20/25
The successor to the 20hp, the Rolls-Royce 20/25 featured increased capacity and improved performance. This engine powered some of the most elegant motor cars of the 1930s. Our expertise ensures these engines continue to perform with the refinement expected of the Rolls-Royce marque.
Engine Specifications
- Inline 6-cylinder
- Overhead valve
- 3,699 cc displacement
- Approximately 65 bhp
Our Engine Services
Comprehensive services for all pre-war Rolls-Royce and Derby Bentley engines
Complete Rebuilds
Full engine rebuilds to original specifications with modern precision
Component Restoration
Individual component restoration and refurbishment
Performance Tuning
Expert tuning to ensure optimal performance and reliability
Expert Care for Your Engine
With over 75 years combined experience and ex-Formhalls credentials, we provide professional support for all pre-war Rolls-Royce and Derby Bentley engines.