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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).
Inter-office correspondence detailing the settings for Delco Shock Absorbers on the MX-5 model.

Identifier  ExFiles\Box 28\1\  Scan174
Date  10th December 1930
  
RRA25 25m-4-29 62111
INTER-OFFICE CORRESPONDENCE
ROLLS-ROYCE
OF AMERICA, INC.
SPRINGFIELD, MASS.

x832

Btn-4

December 10, 1930.

To: Mr. Hives
From: Mr. Burton

Handwritten notes:
70 lbs ball pin = 154 lbs/□"
Lever length 7½"
Inter lever 1.350

Delco Shock Absorbers

The Delcos now on MX{John H Maddocks - Chief Proving Officer}-5 are set thus:

Front Rear
Compression Valve G4 ✓ Valve G2
(Low Pressure) 226 lbs. limit 178 lbs. limit
.016 orifice .0099 orifice

Rebound Valve 2G Valve 3G ✓
(High Pressure) 400 lbs. 320 lbs.
.0014 leakage .0018 leakage

The operation of the low pressure compression valve is two stage:

(a) When the lift is below approximately .100" then the oil is forced through a fixed orifice.

(b) For higher lifts the valve opens under a ball load of 226 or 178 lbs.

The operation of the high pressure valve is just a plain conical valve with leakage in parallel. It is to be noticed that there is a very slight intermediate stage in the opening of this valve where the flow of oil is limited by an orifice, due to leaving about .025 parallel between the bottom of the taper and edge of the discharge slot. This slot is provided to discharge on one side only as it is found that this unbalanced discharge is the most effective and practical method of eliminating valve squeaks.

RBB/VB
Bdn Btn.
  
  


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