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The Napier L48 was a six-cylinder competition car announced for the 1904 Gordon Bennett Cup, but it did not race in that event. It entered competition later, changed engine configurations during its career, and became known as “Samson.” Its recorded speeds—from 104 mph at Daytona in 1905 to 130 mph at Brooklands in 1908—belong to different moments in the car’s development, not one fixed specification.
What was the Napier L48?
The L48 was part of Napier’s early move into six-cylinder racing cars. The Napier Power Heritage Trust says S. F. Edge pressed the company to develop a six-cylinder car and chassis, and calls the six-cylinder car a major motoring innovation for its period. The Trust identifies L48 Samson as one of Napier’s most famous six-cylinder cars and says it competed in Britain, continental Europe and the United States. Napier Power Heritage Trust
The car’s identity is tied to a multi-year racing career rather than a single event or untouched factory configuration. “L48” identifies the car; “Samson” is the name associated with its later racing life. The precise moment when that nickname first became established is not settled by the available accounts.
Did the L48 race in the 1904 Gordon Bennett Cup?
No. A specialist Gordon Bennett Cup history says Napier announced the L48 for the 1904 event, but sent it to Germany without proper testing, and it did not race in the Cup that year. The same account says the car later competed in the 1905 Gordon Bennett Cup and acquired the name Samson after receiving a new engine.
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This distinction matters: being announced for a race is not the same as starting it. The surviving account places the L48’s actual competition appearances after its 1904 announcement.
How fast was the Napier L48 Samson?
There is no single context-free speed figure for a car whose engine and setup changed. The Napier Power Heritage Trust reports that the L48 reached 104 mph at Daytona in 1905. A separate Trust page says Samson exceeded 100 mph in the United States and reached 130 mph at Brooklands in 1908, in its final outing for Edge. These are claims tied to distinct venues and dates. Napier Power Heritage Trust Napier competition cars
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The Daytona and Brooklands figures should not be treated as competing measurements of one unchanged machine: the car’s engine and configuration developed over its racing career.
Why do accounts give different engine dimensions?
Historical sources do not agree on the original engine’s bore. The Napier Power Heritage Trust gives the original six-cylinder engine dimensions as 6.125 inches bore by 5 inches stroke. A Motor Sport Magazine archive letter says three engine sizes were used during the L48’s racing career and reports that 6¼ by 5 inches is the commonly cited original size, while noting that Frank Newton recalled a different measurement and citing Gerald Rose’s 1909 book. The letter documents the disagreement rather than resolving it. Motor Sport Magazine archive letter
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These figures should therefore be attributed to their sources and understood as historical claims about particular engine configurations, not as a definitive specification for every version of the L48.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What does the surviving reconstructed car’s catalogue say?
A 2024 Bonhams catalogue describes an offered L48 as reconstructed, with engine number 1320A and a 15-litre inline-six F-head engine rated at 240 bhp at 2,300 rpm. Those are catalogue details for that reconstructed example; they should not be projected backward onto every configuration the period racing car used. Bonhams Cars catalogue
The catalogue is useful evidence about the reconstructed car, but it does not settle every point in the L48’s period technical history or reconcile the differing engine-dimension accounts.
Are models of the L48 available?
A Bonhams catalogue documents a small-scale model identified as the 1904 Napier L48 “Samson” among models of 1903–1904 racing cars. This establishes that such a collectible model has been catalogued, not that it is currently in stock at a particular retailer. Bonhams Cars catalogue
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