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).
Report comparing a Claudel carburetter against a standard one, detailing performance data and subsequent piston failure.
| Identifier | ExFiles\Box 121\3\ scan0008 | |
| Date | 12th January 1915 | |
| From Exp. Dept. to J.{Mr Johnson W.M.} R.{Sir Henry Royce} E.{Mr Elliott - Chief Engineer} Wor{Arthur Wormald - General Works Manager}/EH2/D12115. 12th. January, 1915. COPY. CARBURETTERS. I have rigged up a single Claudel carburetter to a standard engine. The carburetter has a throat of 32 mm diameter. It has the latest type jet, which is 14 mm diameter. I find that we get a very big increase in HP over our standard carburetter at high speeds. For this increase in power we have to sacrifice acceleration and uniform running at certain speeds. On a car there is no doubt that our own carburetter is the best:- Revs. HP. With R.R. Carburetter. With Claudel 32mm. 1000. 47.5 47.5 1250. 59.4 59.4 1500. 66.9 68.7 1750. 72.9 76.6 2000. 73.3 80.8 This engine was fitted with Zephyr pistons. The compression was increased with the Claudel carburetter, it was 70 to 72 lbs. Before we had completed the test one of the Zephyr pistons collapsed, it cracked all round where the trunk is fastened on to the top - I will send on a photograph showing it. The makers had anticipated them breaking there as they had considerably strengthened them at this point on their latest designs. We are rigging the engine up now with 200 HP aero engine pistons. We can compare these with [Handwritten in left margin]: R1102 [Upside down text at bottom]: R.R. 235A (150 H) (S.A. 44. 8-12-14) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 0855. | ||