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Aviation History
1928
1928 - 0629.PDF
JULY 5, 1928 THE DIRECT-DRIVE BRISTOL " JUPITER VIA": Side and three-quarter rear views. Note helmets over the valve rocker gear. Also the special exhaust-collector ring. " Eclipse " impulse starter, the hand crank for which isinserted from one side. Of the exhibition engines the new arrangement is shown on the series VI A. and on the " Titan."Of other refinements, mention may be made of the mounting of the .valve rockers on ball bearings, so that the periodbetween oilings has now been increased to about 100 hours. The contact between rocker and valve stem is now by aspherical steel ball, and above this is inserted a small felt pad soaked in oil. This ensures lubrication of this importantpart, and will run for long periods. Renewal of the oil pad is done in a few moments. Another new feature of theBristol engines is the enclosure of the valve rockers in " helmets " to protect them from dust and to prevent anyslight oil leaking past the valves from being blown back over the machine. These helmets are secured by a single central bolt and nut, and located and prevented from turningby two small dowels. Following are the leading particulars of the " JupiterVIA.": Bore, 5-75 in. (146 mm.); stroke, 7-5 in. (190 mm.) ; volume,; 1,753 cub. in. (28-7 litres) ; normalspeed, 1,700 r.p.m. ; maximum speed, 1,870 r.p.m. ; rated power at normal speed, 415 at 5,000 ft. (1,525 m.) ; ratedpower at maximum speed, 455 at 5,000 ft. (1,525 m.) ; com- pression ratio, 6-3 to 1 ; standard weight bare, 720 lbs.(327 kg.). The " Jupiter VIII " has the same bore and stroke, butthe normal speed is 2,000 r.p.m. and the maximum speed 2,200 r.p.m. The compression ratio is 5-8 to 1 ; rated powerat normal speed, at 4,000 ft. (1,220 m.) 440 b.h.p. ; rated power at maximum speed, at 4,000 ft. 480 b.h.p. THE BRISTOL " TITAN Made up of five " Jupiter '' cylinders and pistons, etc., this provides a power unit ofmedium power and having very few parts. 577
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