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).
Letter from Specialloid Limited detailing severe piston bench test conditions.
| Identifier | ExFiles\Box 148\4\ scan0290 | |
| Date | 22th September 1934 | |
| Specialloid LIMITED Friern Park North Finchley, N.12. -5- Messrs. Rolls Royce, Limited, 22nd September, 1934. and we are now executing large orders for each of these three manufacturers. Specialloid Pistons have to pass under the severest bench test conditions and we feel that the figures detailed below will be of some interest to you:- The severest bench test in the world is arranged by the London Passenger Transport Board who stipulate that Specialloid Pistons must pass through the following power test:- TEST: PERIOD. 1) Run under power at 1/4 to 1/2 load, 20 h.p. at 1,100 revs. per minute.........15 minutes. 2) Run under power at 3/4 load, 40 h.p. to 50 h.p. at 1,400 revs. per minute....45 minutes. 3) Run under power at full throttle to test maximum power:- 110 m.m. bore 1,700 r.p.m..........15 minutes. 100 m.m. bore 2,100 r.p.m.......... TOTAL TEST PERIOD.........................75 minutes. Other severe bench tests to which Specialloid Pistons are subjected are as follows:- ASSOCIATED EQUIPMENT CO. LTD. TEST: PERIOD. Motor in from 750 - 1,700.................1 1/2 hours. 30 h.p. from 750 - 1,700.................1 1/2 hours. 40 h.p. from 1,350 - 1,700.................1 1/2 hours. Full load - 1,000.......................1/2 hour. " " - 1,350.......................1/2 hour. " " - 1,500.......................1/2 hour. " " - 1,700.......................1/2 hour. " " - 1,900.......................1/2 hour. " " - 2,000.......................1/2 hour. It is noted that the Pistons passing through this test are subjected to 2,000 revs. per minute at full throttle, full load, for 30 minutes and often the oil | ||