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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).
Engine vibration tests focusing on the crankshaft and slipper drives.

Identifier  ExFiles\Box 137\4\  scan0050
Date  1st November 1929
  
Hs{Lord Ernest Hives - Chair}/Tsn5/ADS.11.29 contd.

-B-

We can consider the above tests under two
separate headings, crankshaft and flywheel.

1. CRANKSHAFT.

Results of tests on this and slipper wheels etc.
are briefly :-

(1) We have shewn on the S.S. and Chrysler that the
rotation of even a bare crankshaft in a crankcase can cause
a large amplitude of vibration, and that the addition of
counterweights effects a complete cure.

(2) The above crankcase vibration can exist or be cured
without the driver being much the wiser.

(3) The type of slipper drive appears to affect the
vibration of the engine very considerably at high speeds.

(4) The new stiffer crank with large pins is no
appreciable improvement, although 17% stiffer. (This is to
be confirmed by further tests).

(5) Road tests on an S.S. showed that with counter
weights fitted the car felt, if anything, worse than before.

Dealing in turn with the various engine parts
mentioned above :

(1) Slipper Drives.

Road tests shew that with the low inertia type
there is much less vibration at high speeds in the
neighbourhood of the top period. Early experiments on a
1-Gl{G. Linnett} type of slipper drive on 9-G-111 car showed us
the same effect. In both cases there is some reduction in
  
  


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