Variants
Note:
- Mercury I
- (1926) 808 hp, direct drive. Schneider Trophy racing engine.
- Mercury II
- (1928) 420 hp, compression ratio 5.3:1.
- Mercury IIA
- (1928) 440 hp
- Mercury III
- (1929) 485 hp, compression ratio 4.8:1, 0.5:1 reduction gear.
- Mercury IIIA
- Minor modification of Mercury III.
- Mercury IV
- (1929) 485 hp, 0.656:1 reduction gear.
- Mercury IVA
- (1931) 510 hp.
- Mercury IVS.2
- (1932) 510 hp.
- Mercury (Short stroke)
- Unsuccessful experimental short stroke (5.0 in) version, 390 hp.
- Mercury V
- 546 hp (became the Pegasus IS.2)
- Mercury VIS
- (1933) 605 hp, see specifications section.
- Mercury VISP
- (1931) 605 hp, 'P' for Persia.
- Mercury VIS.2
- (1933) 605 hp.
- Mercury VIA
- (1928) 575 hp (became the Pegasus IU.2)
- Mercury VIIA
- 560 hp (became the Pegasus IM.2)
- Mercury VIII
- (1935) 825 hp, compression ratio 6.25:1, lightened engine.
- Mercury VIIIA
- Mercury VIII fitted with gun synchronisation gear for the Gloster Gladiator
- Mercury VIIIA
- 535 hp, second use of VIIIA designation, (became the Pegasus IU.2P)
- Mercury IX
- (1935) 825 hp, lightened engine.
- Mercury X
- (1937) 820 hp.
- Mercury XI
- (1937) 820 hp.
- Mercury XII
(1937) 820 hp
- Mercury XV
- (1938) 825 hp, developed from Mercury VIII. Converted to run on 100 Octane fuel (previously 87 Octane).
- Mercury XVI
- 830 hp.
- Mercury XX
- (1940) 810 hp
- Mercury 25
- (1941) 825 hp. Mercury XV with crankshaft modifications.
- Mercury 26
- 825 hp. As Mercury 25 with modified carburettor.
- Mercury 30
- (1941) 810 hp, Mercury XX with crankshaft modifications.
- Mercury 31
- (1945) 810 hp, Mercury 30 with carburettor modifications and fixed pitch propeller for Hamilcar X.
Read more about this topic: Bristol Mercury
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