Excelsior 1938 H 11 “ Racing Manxman” 249 cc OHC engine# BRBR102
The Coventry firm of Bayliss and Thomas was as old as the two-wheeler industry, trading from the solid-tyre bicycle era. Early manufacturers in both the motorcycle and the car fields, they were an established firm well before the Great War: In 1913 an 800 cc single cylinder motorcycle was brought out, the biggest production single ever to be made.
In common with many manufacturers, the company used proprietary engines made by Blackburne and JAP. Post-war, to avoid confusion with the American Excelsior, Bayliss and Thomas christened their products “ British Excelsior”.
In the twenties the Midlands company of Reginald Walker and his son Eric took over the firm and moved the plant to Birmingham.
Eric Walker was a racing enthusiast and he promoted the use of Excelsiors in races.
This led to the development of a Blackburne-made four valve pushrod operated racing engine in 1933 – which won the Lightweight TT- , but which was superseded by a less complicated and sturdier engine of their own design, the Manxman.
This engine was produced in capacities of 249, 348 and 498 cc.
The 249 cc model was the most highly developed and the most successful one.
It has bore x stroke dimensions of 67×70.65 mm. With racing specifications it won many races, even after 1945.
This machine consists of a standard 1938 rolling chassis with a 1938 racing engine and equipped with bronze cylinder head .
We have been informed the engine has been assembled on the 3rd of March 1938. “ It ran on the dyno for 4 hours at which time it broke a valve spring. When this was repaired the engine was retested on the 7th and the 8th of March when it produced good power”.
This Excelsior is in excellent shape and a strong runner.