Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 129,103 pages of information and 204,065 images on early companies, their products and the people who designed and built them.
The B.H.P. engine
WWI The authorities brought Frank Halford back from France to develop the 160 h.p. Beardmore engine (which had been based on a water-cooled six-cylinder Austro-Daimler engine) with a view to designing a more powerful unit, which he did with Arrol-Johnston in Dumfries, where he worked with T. C. Pullinger.
In the B.H.P. Halford departed from the accepted practice of using a single large inlet exhaust valve, instead using two small exhaust valves and a single large inlet valve per cylinder.
1917 The outcome was the B.H.P. (Beardmore-Halford-Pullinger) engine — a 230 h.p. (170 kW) vertical six-in-line water-cooled engine embodying cast-iron cylinder heads, steel cylinder liners, and sheet-steel water jackets.