Bristol Jupiter - Variants

Variants

The Jupiter was produced in many variants, one of which was the Bristol Orion of 1926. Metallurgy problems with this turbo-supercharged engine caused the project to be abandoned after only nine engines had been built.

Brazil Straker Jupiter I

(1918) 400 hp. Two built.

Cosmos Jupiter II

(1918) 400 hp. One built.

Bristol Jupiter II

(1923) 400 hp.

Bristol Jupiter III

(1923) 400 hp.

Bristol Jupiter IV

(1926) 430 hp. Variable valve timing, Bristol Triplex carburettor.

Bristol Jupiter V

(1925) 480 hp.

Bristol Jupiter VI

(1927) 520 hp. Produced in both high (6.3:1) and low (5.3:1) compression ratios.

Bristol Jupiter VIA

(1927) 440 hp. Civil version of Jupiter VI.

Bristol Jupiter VIFH

(1932) 440 hp. Equipped with gas starter motor.

Bristol Jupiter VIFL

(1932) 440 hp. Compression ratio 5.15:1.

Bristol Jupiter VIFM

(1932) 440 hp. Compression ratio 5.3:1.

Bristol Jupiter VIFS

(1932) 400 hp. Compression ratio 6.3:1.

Bristol Jupiter VII

(1928) 375 hp. Compression ratio 5.3:1, fully supercharged. Built by Gnome-Rhone as the 9ASB.

Bristol Jupiter VIIF

(1929) 480 hp. Compression ratio 5.3:1. Forged cylinder heads.

Bristol Jupiter VIIF.P

(1930) 480 hp. 'P' for pressure feed lubrication to wrist-pins.

Bristol Jupiter VIII

(1929) 440 hp. Jupiter VI but compression ratio increased to 6.3:1.

Bristol Jupiter VIIIF

(1929) 460 hp. Jupiter VIII with forged cylinder heads and lowered compression ratio (5.8:1).

Bristol Jupiter VIIIF.P

(1929) 460 hp. As Jupiter VIII with pressure feed lubrication (TBO at this stage in development was only 150 hours due to multiple failures).

Bristol Jupiter IX

480 hp. Compression ratio 5.3:1.

Bristol Jupiter IXF

550 hp. Compression ratio 5.3:1. Forged cylinder heads.

Bristol Jupiter X

470 hp. Compression ratio 5.3:1.

Bristol Jupiter XF

540 hp. Compression ratio 5.3:1. Forged cylinder heads.

Bristol Jupiter XFA

483 hp. Compression ratio 5.3:1.

Bristol Jupiter XFAM

580 hp.

Bristol Jupiter XFBM

580 hp.

Bristol Jupiter XFS

Fully supercharged.

Bristol Jupiter XI

Compression ratio 5.15:1.

Bristol Jupiter XIF

500 hp. Compression ratio 5.15:1.

Bristol Jupiter XIFA

480 hp. As Jupiter XIF with 0.656:1 reduction ratio

Bristol Jupiter XIF.P

525 hp. As Jupiter XIF with pressure feed lubrication.

Bristol Orion I

(1926) Jupiter III, turbo-supercharged, abandoned programme.