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).
Comparison of power and detonation for high power heads using single and twin inlet valves.
| Identifier | ExFiles\Box 133\2\ scan0138 | |
| Date | 27th February 1935 | |
| A-103 Power & Detonation Comparison — High Power Heads (Single & Twin Inlet Valves) Area Past Single Inlet Valve = 2.29 sq in " " Twin Inlet Valves = 2.22 sq in " " Exhaust Valve = 1.66 sq in Compression Ratio = 6.15 Carburettor Choke = 36 M/M DIA Y-Axis (Left): B.M.E.P. (Lbs/sq in) X-Axis: R.P.M. of ENGINE Y-Axis (Right): AUDIBLE RANGE OF DETONATION (FEET) Graph Text: OPEN EXHAUST B.M.E.P (CORRECTED to N.T.P) FUEL = DTD 224 B.M.E.P. CORRESPONDING TO DETONATIONS (SILENCED) (UNCORRECTED) VALVE TIMING:- I.O. 2°E.{Mr Elliott - Chief Engineer} E.O. 51°E.{Mr Elliott - Chief Engineer} I.C. 28°L. E.C. 7°L. DETONATIONS WITH TWIN INLETS (BAR = 751 M/M TEMP. 13°C). FUEL = No1 SHELL. DETONATIONS WITH SINGLE INLET (BAR = 768 M/M TEMP. = 8°C). FUEL = No1 SHELL. | ||