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. | ||