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| | Comp | Valve Clearances | Carburettor | Fuel System | Ignition Timing Setting |
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| B.18A Type 1 | 8,5:1 | 0.40 - 0.45 | Zenith 36 VN | Diaphragm AC-UG or AC-YD | 97 Octane @ 1500 rpm |
| B.18A Type 2 | 8.7:1 | (0.016” - 0.018”) | Zenith.Stromberg 175 CD-25 | or Pierburg APG | 21 ° - 23 ° B.T.D.C |
| B.18B Type 1 | 9,5:1 | 0.50 - 0.55 | SU - HS6 | dto. | 100 octane @1500 r.p.m |
| B.18B Type 2 | 10,0:1 | 0.020” - 0.022” | SU - HS6 | dto. | 17 ° -19 ° B.T.D.C |
| B.18B Type 3 | 10,0:1 | | | | 3 ° - 5 ° @ 850 rpm |
| B.20A | 8,7:1 | 0.40 - 0.45 | Zenith-Stromberg 175CD-2SE | Diaphragm AC-YD | 100 octane @ 600-800 rpm |
| B.20B | 9,5:1 | 0.50 - 0.55 | SU HS6 or Zenith-Stromberg 175D-2SE | Pierburg APG | 10° B.T.D.C |
| B.20E | 10,5:1 | 0.40 - 0.45 | controlled fuel injection | Electric Rotor | 700 - 800 rpm |
| B.20F | 8,7:1 | (0.016”-0.018”) | controlled fuel injection | Electric Rotor | 10 ° B.T.D.C |
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