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).
Investigations into rough engines and chronic pounding on the L.H. P.I. Chassis.
| Identifier | ExFiles\Box 19\3\ Scan368 | |
| Date | 16th May 1930 | |
| x7772 To: Ex. from Oy. C. Wep. C. Mr. C. Hs.{Lord Ernest Hives - Chair} C. De/Ev.{Ivan Evernden - coachwork} (De is struck through) C. Smn. L.H. P.I. Chassis. Rough Engines. You recall that I spoke to you about our ideas in correctly lining up the joint between intake bend and manifold as a cure for rough engines. Attached copies from Burton and Soutter give rather negative evidence. I think one can say :- (1) Improved intake joint improves power in cases where our test with cylinders shorted out shows bad distribution. (2) Improved intake joint noticeably improves smoothness from the point of view of an owner driver like Ainsworth who has driven perhaps ten thousand miles on the one car. (3) Chronic pounding such as the cases mentioned cannot be cured by intake joint, but is a matter of body-resonance, and can only be cured by rubber engine suspension, rubber body mounting, or redesign of body. It may be interesting that soft tops and long scuttles i.e. touring cars, seem to be worst for pounding. You will notice that when a new chassis is fitted to the old body, the pound goes with the body and not with the chassis. Oy. | ||