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 bed work chart detailing piston development and failure analysis for the 3 1/2 Litre Bentley engine.
| Identifier | ExFiles\Box 86\2\ scan0146 | |
| Date | 6th November 1933 | |
| PISTON DEVELOPMENT. 3 1/2 LITRE BENTLEY. (TEST BED WORK.) HS{Lord Ernest Hives - Chair} 1200 PISTON | UNIT | HOURS RUN | FAILURE ROW 7: PISTON: PIECE N° E.B. 1299, A/P. 404 DIE CAST, SPECIAL HEAT TREAT (CHILLED FROM THE DIE), GRINDING E.B. 1025, STRENGTHENED GUD:, PIN BOSS LEC. 3675, PUSH FIT GUD. PINS. UNIT: SPEC. C XI, RHC{R. H. Coverley - Production Engineer}/WSC.{W. S. Cassel}1/AP 31-10-33, CYL. BLOCK., SHORT TYPE BARRELS. HOURS RUN: TEST: 2 HRS 0 MINS AT 4000 R.P.M. FULL THROTTLE, 1 HR 40 MINS AT 4250 R.P.M., 0 HR 10 MINS AT 4500 R.P.M., 2 HRS 15 MINS AT 2000 R.P.M., 0 HR 45 MINS AT 4500 R.P.M. LIGHT LOAD. N°4 PISTON CROWN ADRIFT ALL PISTONS CRACKED AT TOP OF RIBS FROM GUDGEON PIN BOSS. FAILURE: CRACKS, SECTION. ROW 7 (cont.): PISTON: PIECE N° E.B. 1026, A/P. 404 DIE CAST, GRINDING E.B. 1025. UNIT: SPEC. C XI, RHC{R. H. Coverley - Production Engineer}/WSC.{W. S. Cassel}9/AP 25-10-33, RHC{R. H. Coverley - Production Engineer}/WSC.{W. S. Cassel}3/AP. 28-10-33, CYL. BLOCK., SHORT TYPE BARRELS. HOURS RUN: TEST PROCEEDING. TEST: 4 HRS 0 MINS. AT 4000 R.P.M. FULL THROTTLE, 3 HRS 20 MINS AT 4250 R.P.M., 0 HR 40 MINS AT 4500 R.P.M. GUD PINS MADE PUSH FIT. Nos. 4 & 6 PISTONS CRACKED ABOVE GUD PIN BOSS. FAILURE: CRACKS, SECTION. ROW 8: PISTON: PIECE N°, 'AEROLITE' PISTONS, 2ND DELIVERY, PUSH FIT GUD PINS. UNIT: SPEC. B.2, RHC{R. H. Coverley - Production Engineer}/WSC.{W. S. Cassel}3/AP 6-11-33, CYL. BLOCK., SHORT TYPE BARRELS. HOURS RUN: TEST PROCEEDING. No. FAILURE PISTONS O.K. ONLY PISTONS SO FAR TO RUN 19 HOURS WITHOUT CRACKS. 'AEROLITE' LIGHTENED TYPE. FAILURE: (blank) ROW 9: PISTON: PIECE N° E.B. 1299, A/P.404 DIE CAST, GRINDING E.B. 1025, STRENGTHENED GUD:, PIN BOSS LEC. 3675, PUSH FIT GUD. PINS. UNIT: SPEC. B.6, CYL. BLOCK., SHORT TYPE BARRELS. HOURS RUN: TEST PROCEEDING. CRACKS IN TWO PISTONS SAME POSITION AS TEST 7. FAILURE: CRACKS, SECTION. | ||