Napier L48, also known as Napier 6 or Napier 90 hp, was powered by 6-cylinder 848 cubic inches engine produced 90 hp. The car featured tubular radiators running along each side of the bonnet, giving the car a distinctive appearance. On January 25th 1905 British racing driver Arthur McDonald set a new speed record of 104.65 mph (168.38 kph) on the sands of Daytona Beach in Florida. He covered 5 mile distance in 3 minutes and 17 seconds. The record was unofficial because it was set in a run which did not correspond to official regulations. Later that year McDonald also drove his Napier in British Eliminations trials for the Gordon Bennett Cup, held on the Isle of Man, but retired. His teammate Clifford Earp drove 90 hp Napier in the Gordon Bennett race finishing 8th out of 18 starters.
| Season | Series | Event |
| 1905 | Speed Record Trials | Daytona Speed Record Trial |
| Driver | No. | Entrant |
| Arthur McDonald | 15 | |
| Scale | Manufacturer | Collection |
| 1:43 | Brumm | |
| Cat. No. | Quality | Rarity |
| R116 | 
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