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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).
Notes on engine rattles felt on the chassis due to crankshaft periods, with test results.

Identifier  ExFiles\Box 25\3\  Scan022
Date  20th June 1911
  
E.H.R. 148 (90 R) cW 157. 24.1.11) G 1410.
Engine Period X634 4100.
Rattles -, felt on chassis at start.
what art.
from crankshaft periods, damped out by Setter wheel
On 166B. - bad case.
If full power rattles higher speeds
If less power rattles lower speed.
Following tests - full power
car speed | Engine speed 3 2/8 gear
22 gear.
9 slight | 270
16-18 noticeable | 430-450.
22.5 bad | 670-680
31 - slight | 950
40-47 - bad | 1250-1460
eP.{G. Eric Platford - Chief Quality Engineer}
20/6/11
  
  


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