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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).
Standardisation of 45° angle valve seats to avoid valves burning on 20 HP cars.

Identifier  ExFiles\Box 172\1\  img040
Date  1st September 1923
  
R.R. 755 (10M) (SL 72 18-7-23) MP 274954s.
COMPLETED 14.9.23.
STANDARDISATION of CHASSIS PARTS. Date 1.9.23.
Description of Parts: 45° angle seats [STAMPED: ORIGINAL]
Origin: To avoid valves burning.
[BOX]
X No.4226
Drawing No.
Part List
A Scrap and replace at all costs including Chassis already delivered to customers.
B Scrap and replace on Chassis in works.
C Scrap present stock and replace on all Chassis not yet handed to test.
D Use existing stock Alteration effective on future Chassis.
[/BOX]
Experimental Test Report: We have had a number of instances of valves burning on 20 HP. cars both on experimental and customers cars. Tests prove 45° angle seats a definite improvement. See report Hs{Lord Ernest Hives - Chair}1/LGL.9.23.
Road Test Report: Run on Test Bench for 24 hours. Fitted to 4-G-11 and 7-G-11. This follows the practice now adopted on 40/50 H.P. Present valves can be modified.
Weight of Old Part: ---
Cost of Old Part: £ ---
Weight of New Part: ---
Cost of New Part: £ ---
Difference per Car: ---
Difference per Car: £ No change in cost.
Cost of Parts in Works which will be scrapped if commenced on:---
Series......... £.........
Series......... £.........
Series......... £.........
Signature of Mr. De LOOZE that above is correct. My/JW 10.9.23.
SIGNATURES | DATE | REMARKS
MR. JOHNSON | 13.9.23 | Agreed. CJ.
MR. B. JOHNSON | 13.9.23 | Agreed. BJ.
MR. ROYCE | 5.9.23 | FHR. agreed. Uniformly believed the 45° seat is the best but not yet conclusive why 40/50 needs one shape of valve & 20 HP another.
MR. WORMALD | 12.9.23 | Agreed. Wor.{Arthur Wormald - General Works Manager}
MR. ROWLEDGE | 3.9.23 | Agreed. Rg.{Mr Rowledge}
MR. DAY | 5.9.23 | Agreed DA{Bernard Day - Chassis Design}
MR. BAILEY | 3.9.23 | Agreed. BY.{R.W. Bailey - Chief Engineer}
MR. PLATFORD | 3.9.23 | Agreed. EP.{G. Eric Platford - Chief Quality Engineer} What about retrospective action. Suggest column to this effect at 'A'.
MR. ELLIOTT | 5-9-23 | Agreed QE.
MR. NORTHEY | 4.9.23 | Agreed. PN.{Mr Northey}
MR. HIVES | 12.9.23 | Agreed. E.Hives.
[LARGE GREEN STAMP: HP CHASSIS]
  
  


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