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).
Graph showing the power loss to the exhaust manifold for a Super Sports Engine, comparing open ports to a manifold.
| Identifier | WestWitteringFiles\S\September1928-October1928\ Scan200 | |
| Date | 26th October 1928 | |
| POWER LOSS TO EXHAUST MANIFOLD. SUPER SPORTS ENGINE. ENGINE No SS.{S. Smith}3. STD. 'PHANTOM' CARBURETTOR. BRAKE HORSE POWER 130 110 90 70 50 OPEN EXHAUST PORTS. EXHAUST MANIFOLD TO LEC. 2518. PERCENTAGE LOSS TO MANIFOLD. R.P.M. OF ENGINE 1000 1500 2000 2500 PERCENTAGE LOSS OF POWER. 2% 1% 0 V470. 26.10.28 | ||