From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Valve timing settings and maximum Mean Effective Pressure and Brake Horsepower performance figures.
| Identifier | ExFiles\Box 134\1\ scan0072 | |
| Date | 24th January 1938 guessed | |
| -2- Valve timing at running clearance, Inlet open 24° Before TDC. Inlet closes 75° Past BDC. Exhaust opens 75° Before BDC. Exhaust closes 40° Past TDC. (2) Exhaust closing at 6° before TDC. over heavy accelerations and 24° past TDC at the running timing Open exhaust with case (1) Max. MEP. Max. BHP. 117 lbs.sq. at 1,000 r.p.m. 109 at 3,500 r.p.m. With silencer fitted 92 at 3,500 r.p.m. 117 lbs.sq. at 1,000. .................. Open exhaust case with (2) 119 lbs. sq. at 1,000 r.p.m. 103 at 3,500 r.p.m. With silencer fitted. 116 lbs. sq at 1,000 r.p.m. 89.5 at 3,500 r.p.m. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||