Brooklands performance test sheet for a close-coupled four-seater, comparing different carburettor and engine power configurations.
| Identifier | ExFiles\Box 5a\5\ 05-page153 | |
| Date | 14th August 1931 | |
| RM. {William Robotham - Chief Engineer} 28 12 G IV BROOKLANDS TEST 14/8/31 CLOSE COUPLED FOUR SEATER WT. 32-25 CWT AXLE RATIO 11x50 TYRES 6" FORT DUNLOPS 19" RIMS. 60 MPH = 3000 RPM CONDITION OF CAR AND UNIT 1) CAR IN STANDARD T SERIES CONDITION BUT WITH STRONGER VALVE SPRINGS WHICH SHOULD HAVE NO EFFECT AT THIS SPEED 2) As 1 BUT S.U. CARB 3) ENGINE GIVING 80 B.H.P AS IN CURVE RM {William Robotham - Chief Engineer} 27. STD CARB. C.O. CLOSED. P.I. EX. SYSTEM. 4) As 3 BUT C.O. OPEN. 5) ENGINE GIVING 89 B.H.P. AS IN CURVE RM. {William Robotham - Chief Engineer} 27 S.U. CARB C.O. CLOSED 6) As 5 BUT C.O. OPEN. LAP TIME 2 MIN 31.4 SEC 2 MIN 26.4 SEC 2 MIN 17 SEC 2 MIN 15.6 SEC 2 MIN 12.4 SEC 2 MIN 10 SEC LAP SPEED* 65.78 MPH 67.57 MPH 72.49 73.45 75.23 76.62 AIR TEMP 19° C TOP WATER TEMP PLAIN BONNET 82° C LOUVRED - 74° C PETROL CONS 160 MILES DERBY - BROOKLANDS RR CARB. 21 M.P.G. S.U. CARB. 20.0 M.P.G. 19 G IV 10,000 MILES CAR LAP SPEED 63.7 M.P.H Stamp: EXPERIMENTAL DEPT. WORKS MANAGER 17 AUG 1931 DERBY | ||
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).