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).
Engine performance regarding fuel, cooling, oil temperatures, and component specifications.
| Identifier | ExFiles\Box 173\3\ img040 | |
| Date | 4th April 1934 guessed | |
| III/ reduces induction pipe roar, its own intake hiss being easily dealt with by an ordinary A.C. cleaner. FUEL. The engine will run on the ordinary American fuel (which I believe has an octane value about 74) without any trouble or serious detonation. It does not require the Ethyl Gasoline which has 78-80 octane & costs 3 cents/gal more. COOLING. They have not increased their radiator size. They contend the increased speed balances the increased power, this however appears questionable. OIL TEMPS. They are using 2 1/8" dia big eng ends 1 1/4" long. Their piston is heavy, being of the invar strut type, and weighs 21 1/2 oz. The engine runs up to 5000 R.P.M. before the valves bounce and therefore, considering they are white metal, we should think that these bearings are right on the limit. However they state that they ran last summer in the hot weather without an oil cooler and did not experience any trouble. They have also completed 100 hours bench test. | ||