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).
Comparison of Pierce Arrow and Phantom connecting rod piston assembly weights, with a request to source Pierce Arrow parts for inspection.
| Identifier | ExFiles\Box 65\4\ scan0300 | |
| Date | 2nd January 1928 | |
| X. 8030 To OY. from Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} Hs{Lord Ernest Hives - Chair}/Rn{Mr Robinson}2/LG2.1.28. COMPARISON OF PIERCE ARROW AND PHANTOM CONNECTING ROD PISTON ASSEMBLY. X.4588 It is interesting to note the weights of the Pierce Arrow conn. rod and piston given in The Automotive Industries Nov. 5th./27. The Pierce Arrow stroke and pin dia. are identical with that of the Phantom, the bore is 4" against the Phantom 4.250. The weights of the conn. rod and piston assemblies are as follows :- Rolls-Royce - 5.87 lbs. Pierce Arrow - 3.062 lbs. Assuming the Pierce Arrow bore to be increased to 4.250" and the weight of the piston to go up as the square of the dia., the weight of the total assembly only becomes about 3.362 lbs. so that proportionately the Pierce Arrow is 70% lighter on these parts than we are. Could you ascertain for us if the figures given in 'The Automotive Industries' are correct, and if so, we should be vitally interested to obtain a set of Pierce Arrow parts if this is at all possible. Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} | ||