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).
Camshaft design fears and suggestions for various car work engines.
| Identifier | ExFiles\Box 13\2\ 02-page088 | |
| Date | 5th June 1931 | |
| [Handwritten: X7090] HS.{Lord Ernest Hives - Chair} } FROM R.{Sir Henry Royce} & E.{Mr Elliott - Chief Engineer} BY.{R.W. Bailey - Chief Engineer} } Copy. R1/M5.6.31. c. to SG.{Arthur F. Sidgreaves - MD} WOR.{Arthur Wormald - General Works Manager} RHC.{R. H. Coverley - Production Engineer} CAR WORK - J.1. & P. 2. CAMSHAFTS X. 5090. X. 7090. The R.{Sir Henry Royce} engine cam forms are the same for inlet and exhaust. We fear: (1) Mechanical noise because of coarse foot and clearance. (2) Roar because of inlet opening before T.D.C. (3) Spoiling slow running because of (2) Car work demands finer root and clearance - .013" - and we think shorter inlet than exhaust by 2 divisions - 4o = 8o on flywheel. It gives less overlap and later inlet opening: other points of opening and closing are the same. My memo. of 21.5.31. mentions for J.1. two camshafts which it is understood you have - i.e. no.1 and 3. They are made with cams of inlet 57 div. and exhaust 61 div: but two angles between 114o and 116o. These should be an excellent camshaft for car work, and we can so far only repeat. We gave in the same memo. and ultra high speed one using the above exhaust as inlet, and new exhaust of 63 div: - design sch.1158. We can only repeat this for new P. 2. high speed camshaft, with higher lift of .473". R.{Sir Henry Royce} | ||