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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).
Test results for hydraulic tappet plunger resistance under various loads and clearances.

Identifier  ExFiles\Box 17\6\  Scan343
Date  25th March 1935
  
HS{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux}5/KW.25.3.35.

28-EX - Hydraulic Tappets.

Resistance of plunger with various loads.

Plunger and oil temperature 80°C.

Time in secs. taken for oil to escape and movement of plunger, with plunger clearance made to .002" and .0025".

Load applied

.002 clearance

50 lbs.
.0625 2 secs.
.0625 2.5 "
.0625 3 "
.0625 4 "

40 lbs.
2 secs
3 "
3 "
4 "

30 lbs.
.0625 3 secs.
.0625 4 "
.0625 5 "
.0625 5 "

25 lbs.
5 secs
6 "
6 "
6 "

.0025 clearance

50 lbs.
.0625 1 sec.
.0625 1 "
.0625 1 "
.0625 1 "

40 lbs.
1 sec.
1 "
1.5 secs.
1.5 "

30 lbs.
.0625 1.5 secs
.0625 2 "
.0625 2 "
.0625 2 "

25 lbs.
2.5 secs.
2.5 "
2 "
2.5 "

Hs{Lord Ernest Hives - Chair}/G.W.Hancock.
  
  


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