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).
Experimental subframe mounting techniques and tests on body 'booming' and engine roughness.
| Identifier | ExFiles\Box 14\8\ Scan229 | |
| Date | 12th March 1930 | |
| To DA{Bernard Day - Chassis Design}/EV.{Ivan Evernden - coachwork} From Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c.c. to Ds. E.{Mr Elliott - Chief Engineer} 87380 Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}1/WJ.12.3.30. SUBFRAME MOUNTING. We have been reading the Rolls-Royce book on "The Body and Subframe". All our experimental car subframes have been mounted on the front and rear rubber supports. We have used the centre support - (a) For lining up the body laterally. (b) To hold the body in the correct position while rubber packings of the correct thickness were made for the rear support. After the body has been properly supported at the front and rear we have always seen that there was clearance between the centre support and its stop. The reason we have never used the centre support to carry the weight of the body is because we thought one of the objects of the subframe was to avoid direct contact between the body and the chassis. When we were making experimental tests on body "Booming" and engine roughness we proved that removing the aluminium side-ways locating washers E.55576 much reduced the tendency for engine roughness to be felt in the body. We asked J.L.E. to try the same experiment on a "Booming" car he had for delivery in London but he could not detect any improvement, presumably, because in addition to these washers there was a metal to metal contact at the central support. | ||