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).
Alternative piston designs and power increases for Bentley vehicles.
| Identifier | ExFiles\Box 86\2\ scan0179 | |
| Date | 24th January 1934 | |
| J.236 To E.{Mr Elliott - Chief Engineer} From Hs.{Lord Ernest Hives - Chair} c. to Sg.{Arthur F. Sidgreaves - MD} c. to Wor.{Arthur Wormald - General Works Manager} c. to By.{R.W. Bailey - Chief Engineer} Hs.{Lord Ernest Hives - Chair}5/MJ.24.1.34. PISTONS. (BENTLEY). When we were in trouble with pistons several alternative designs of pistons were instructed - LEO.3679, 3698, 3699. At the time these were instructed there is no doubt they were required. As it takes, however, a very long time to prove out a new piston and as we are now reasonably satisfied with the pistons we are now fitting as standard on the Bentley, we have to decide which of these pistons we wish to go for. In our opinion LEO.3699, the semi-split piston, is the one we ought to press forward with as an alternative piston. Whilst we are looking around for increased power on the Bentley it has still got to be realised that there is an increase of 5 or 6 HP. with the Aerolite type pistons. A set of these are running in Ip's. car at the present time. We may expect that pistons made to LEO.3699 which are semi split and shorter than the present standard may give us some of the increase we get with the Aerolite. This, however, is still to be proved. Hs.{Lord Ernest Hives - Chair} | ||