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).
Spectre engine push rod loading, detailing a new experimental steel push rod.
| Identifier | ExFiles\Box 4\1\ 01-page187 | |
| Date | 13th December 1934 | |
| TO B.Y. Copy to Hs{Lord Ernest Hives - Chair}/Hm.{Capt. W. Hallam - Head Repairs} NMP. E/S&D.{John DeLooze - Company Secretary} 4300 E/PSN.3/MN.13/12/34. P. Le Smeth SPECTRECodename for Phantom III PUSH ROD. We send you herewith LeC 4250 showing a steel push rod for the SpectreCodename for Phantom III. On checking over the push rod loading we find that the push rods are rather overloaded compared with those on our existing engines. The particulars are as follows:- Inertia load at 4,500 r.p.m. 298 lbs. Spring load. 80 lbs. Gas load (exhaust valve) 97 lbs. Total. 475 lbs. Theoretical collapsing load. 240 lbs. Deflection at 4,500 r.p.m. .0065" Weight. .091 lbs. As the clearances are not sufficient to enable us to increase the push rod diameter we are instructing the steel push rod for experimental purposes. The particulars of this rod are as follows:- Theoretical collapsing load. 545 lbs. Deflection at 4,500 r.p.m. .0033" Weight. .171 lbs. Although the steel push rod is .08 lbs. heavier the effect of this increase in weight in reducing the bouncing speed may be offset by the beneficial effect on bouncing speed of the considerable reduction in valve gear deflection. E/PSN. Att. LeC.4250. Print to MHC. | ||