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).
The performance improvements of fitting a 14/52 axle ratio to a 1.EX car.
| Identifier | Morton\M22\ img073 | |
| Date | 2nd May 1921 | |
| To Mr. [REDACTED] C. to R.H. C. to E.{Mr Elliott - Chief Engineer} C. to Da.{Bernard Day - Chassis Design} C. to M.{Mr Moon / Mr Moore} C. to F.H. C. to Ef. ORIGINAL 1EX Hs{Lord Ernest Hives - Chair}2/LG2.5.21. x4299 x5763 14/52 AXLE RATIO. We are running an axle fitted with 14/52 gears. The axle is good as regards silence. We have fitted it to 1.EX Car which has a light open-touring body. Under the road conditions existing round Derby, this light car fitted with a 14 tooth axle, gives a better performance - there is a definite improvement in acceleration, hill climbing and average speed. The 14/52 axle on any car will always give a better performance up to at least 60 M.P.H. We are preparing curves showing engine horse power and road wheel horse power of high and low compression cars plotted against - 16 X 52, 15 X 52 and 14 X 52 axles. Hs.{Lord Ernest Hives - Chair} R.S. 288A (100 T) (S.H. 188. 10-12-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 8947 | ||