The Lagonda LG45 is a sports car built by the British Lagonda company from 1936 until 1937. The company had entered receivership in 1935 and had been reformed as LG Motors (Staines) Ltd. The new company carried on largely as before, renaming this evolution of the Lagonda M45 to reflect the new company name and the car's 4.5-litre engine. The M45's Meadows-designed, engine was also given various updates engineered by recent hire W. O. Bentley, including a new exhaust manifold and twin magneto ignition. These resulted in power increasing to for the final iterations. The engine's displacement is , from a bore and stroke of and . Unveiled in September 1935, it also featured hydraulic shock absorbers and rubber engine mounts.
The LG45 underwent continuous revisions during the construction period, with the three main models being referred to as Sanction 1, 2, and 3, with each revision adding more and more Bentley designs. In 1937, the car was updated yet again and renamed the LG6. The LG6 received further engine improvements, but most importantly it was given indeoendent, torsion bar front suspension, and hydraulic (rather than mechanical) brakes.
A Lagonda LG45 driven by Richard Seaman and Freddie Clifford finished fourth in the 1936 24 Hours of Spa. It also entered the 1936 French Grand Prix, and the 1937 24 Hours of Le Mans.
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