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).
Experiments with cast iron and plunger pistons, detailing issues and potential modifications.
| Identifier | WestWitteringFiles\D\December1919\ Scan26 | |
| Date | 29th December 1919 | |
| R R.{Sir Henry Royce} 235 A (100 T) (S F.{Mr Friese} 575, 16-4-19) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2354. Contd. -2- HS{Lord Ernest Hives - Chair}5/LG29.12.19 **************** If they collapse, however, in the same way as the present ones, we might try fixing a cantilever spring off the gudgeon pin bosses, to prevent this occurring. We have run some cast iron pistons of the old standard type which had been split. We had these pistons ground the same size as the bore. We ran them in the cylinder under all sorts of conditions without any signs of seizure. The point against them appears to be that in their present form, when split, they are too flexible. We are making further experiments with the cast iron pistons using the letter-box slit as well as the standard split. X.3715 X.3743 The plunger pistons are going very well - we are running a set in 49-GB. They over-oil, but not bad enough to cause the Lodge plugs to miss-fire. We think the spring as well as the oil pressure will be a great help on these pistons. There is a tendency for these pistons to knock when hot; we think this is due to the oil leaking out and not being replaced quickly enough. We are hoping to get a set of these pistons sufficiently good to be fitted into the 10,000 mile car(2.EX) which leaves the Works in a weeks time. HS.{Lord Ernest Hives - Chair} | ||