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).
Power curve graph comparing 'Super Sports' Phantom, 'Continental' Phantom, and average production engines.
| Identifier | WestWitteringFiles\S\June1928-August1928\ Scan142 | |
| Date | 28th August 1928 | |
| V403 "SUPER SPORTS" PHANTOM POWER CURVE. ENGINE No. S.S. 3. COMP. RATIO = 4.5 CLAUDEL-HOBSON CARB. AREA PAST CHOKE = 1.532 ☐" OPEN EXHAUST. VALVE TIMING (.020 Clce) INLET OPENS 14° AFTER T.D.C INLET CLOSES 34° AFTER B.D.C. EXHAUST OPENS 34° BEFORE B.D.C. EXHAUST CLOSES 2° AFTER T.D.C. "SUPER SPORTS" PHANTOM "CONTINENTAL" PHANTOM COMP RATIO = 4.63 TEST BED EXHAUST SYSTEM. CLAUDEL HOBSON CARB. AVERAGE UNIT TEST (PRODUCTION) BRAKE HORSE POWER R.P.M OF ENGINE. | ||