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 unit Phantom II No. 28 (28-EX) after a 15,000-mile test, detailing performance and modifications.
| Identifier | ExFiles\Box 11\5\ 05-page210 | |
| Date | 7th May 1935 | |
| To sg.{Arthur F. Sidgreaves - MD} From HS{Lord Ernest Hives - Chair}/CWH. c. to Nor. c. to E.{Mr Elliott - Chief Engineer} c. to Hy.{Tom Haldenby - Plant Engineer} c. to RP. c. to MX.{John H Maddocks - Chief Proving Officer} REPORT ON 28-EX AT 15,000 MILES. ENGINE UNIT. Ph. II No. 28. The power and slow running remained good, even after cutting and grinding in the exhaust valve seatings. No further trouble was experienced during the remaining 5,000 miles. The smoothness of the engine was retained with the engine mounting finally built up as follows :- Standard front cross member and torque reaction dampers. Front engine feet with rubber blocks as designed. This prevented the excessive rocking over of the engine and gave the flexibility required to damp out vibrations to the frame. VALVES & FITTINGS. IOP. E.64693, Lec.3960, 3876, 3886. Cylinder Head modified to E.86854. Control oil feed only. Exhaust Valves Nos. 5, 6 & 10 stellited, EX.15162. Inserts NNC. " 1, 2, 3, 7, & 11 standard E.85640. Inlet Valves EX.15120. Lightened type with drilled stems. E.85666 Valve Springs. Lec.3960 scheme to prevent valves from dropping into cyl.head. E.84407 Rocket Shaft. Copper deposited. E.84413/4 Cast Iron Eccentrics. No.1360 Spacing Springs. E.85552/3/4/5 Plunger Casings with metering plugs to No.1470. No.1471 Rocker Bushes. Lec.3886 Poppet Valve Plungers. Standard Valve Spring E.81550. When dismantled at the finish of the mileage the valve seatings were in a good condition. No further contraction of the inserts made in NNC had taken place. The valves were generally quiet in operation. We had occasional trouble with the automatic tappets becoming noisy. They became quiet again after a short distance had been run. The oil supply was adequate. | ||