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).
Test report on 'turbulent' type heads for the lighter Phantom engine, aimed at reducing detonation and continued firing.
| Identifier | ExFiles\Box 17\6\ Scan005 | |
| Date | 10th December 1926 | |
| To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/ACL. c. to BJ. Hcr. c. to E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design} c. to RS.{Sir Henry Royce's Secretary} EY. X7060 Hs{Lord Ernest Hives - Chair}/ACL1/LG10.12.26. LIGHTER PHANTOM ENGINE. ----------------------- X.699 X.3867 X7060. Some further tests have been carried out on the lighter Phantom engine with the 'turbulent' type head, the object being to test what influence the various heads had upon reducing the tendency to detonate and continued firing after switching off the ignition, both troubles which are manifest on the standard Phantom. Three heads have now been tested - the original aluminium head LeC.2229, the original head with the valves reduced to 1.800 dia., and the alternative form of head LeC. 2230 which has the smaller opening into the combustion space or larger deflecting surface between the piston top and the head. This sketch shows the types tried. In our previous report on this engine we stated that the clearance between the head and the piston was reduced from .128 to .058 for the purpose of a test. It was thought that the smaller clearance would promote contd. --- Blueprint Text --- No 1. LeC. 2229. 2.650 No 2. Same as No.1, but fitted with smaller valves (1.800 dia) 2.650 No 3. LeC. 2230. 1.850 | ||