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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).
Series of engine oscillation tests with varying parameters.

Identifier  ExFiles\Box 113\5\  scan0177
Date  5th December 1936
  
-3-

1200 R.P.M. cured by 17 lbs. period goes up to
1450 " " " 25 " " " "
1500 " " " 30 " " " "
1550 " " " 35 " " " "

Then there is no further oscillation throughout the speed
range with a maintained tensioner load of 35 lbs.

Test No.6.

Flywheel Ex.25336. fitted to camshaft; otherwise conditions as test No.5.

Result. The amplitude of oscillation is now reduced by at least 50%. It would be thought, therefore, that following the method of test No.5. of increasing the tensioner load, the oscillation should be damped out by a correspondingly lighter load on the tensioner. Actually, the speeds of the periods were the same, it required the same increase in tensioner load to damp them out, as in test No.5.

Test No.7.

Spring drive solid, only one inlet valve per cylinder.

Result. The actual value of this move is equivalent to fitting the flywheel in test No.6.

It would be thought, that fitting the flywheel to the camshaft, would just about cure the remaining oscillation; but in actual fact, the addition of the flywheel in this particular test does not bring about any further improvement.

Test No.8.

Spring drive solid. Only one inlet valve per cylinder. All inner valve springs removed.

Result. Very slight decrease in the amplitude of oscillation. The difference is hardly noticeable compared with test No.7. Here again the addition of the camshaft flywheel is practically unnoticeable.

Test No.9.

Spring drive returned to standard; otherwise as test No.8.

Result. Same as test No.8.
  
  


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