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).
Seized anodised pistons in a B-6 unit and a proposal to modify the cylinder block to continue testing.
| Identifier | ExFiles\Box 86\2\ scan0294 | |
| Date | 12th November 1934 | |
| To RHC.{R. H. Coverley - Production Engineer} x236 Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}13/KW.12.11.34. B-6 Unit - Anodised Pistons. We have run 3 anodised pistons in B-6 unit, they have all 3 seized up. This indicates that we have insufficient clearance. We have 3 other anodised pistons for test. We should like to test them in B-6 unit. The cylinder block is scrap, but if the 3 good bores could be honed out to give 3, 3 1/2 and 4 thou. clearance across the pressure face on the remaining 3 anodised pistons, the engine could be re-built and the test completed. The 3 remaining anodised Aerolite pistons are all of different dimensions and so the bores will have to be honed to suit. Scrap standard pistons could be run in the 3 scored bores to enable the test to be completed. You will appreciate that all we are trying to find out is whether the standard clearance is right for pistons that have been anodised, or whether some modification is required. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||