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).
Bentley exhaust valve clearances for different driving conditions.
| Identifier | ExFiles\Box 27a\1\ Scan290 | |
| Date | 26th July 1935 | |
| S. Paris X1245 Rm{William Robotham - Chief Engineer}/26/7/35- Thanks for your note. We'll struggle with the steering on the Bentley. - One Point, as you know we have fitted K.E 965 exhaust valves to all Bentley cyl heads. This steel has a greater coefficient of expansion than the original. It really requires .006 clearance + for hard continental blending. - For English conditions we get away with .004 and less noise so this is the standard setting. You must watch your chassis however and set them to .006 unless a customer complains of noise + doesn't drive hard. If you don't do this you will get stretched valves. Jim | ||