MGB TOURER AND GT Special Tuning

MGB TOURER AND GT Special Tuning PDF. This is another of the M.G. Tuning Booklets which have been issued in recent years. It deals specifically with the Series MGB.

The ‘MGB’ as delivered from the Factory in its standard form is tuned to give maximum performance with 100-octane gasoline consistent with complete reliability and reasonable freedom from pinking. There is, however, a more or less continuous demand from enthusiasts all over the world for information on methods of improving the performance for competitive purposes, and it is to meet this demand that this booklet has been prepared.

It must be clearly understood, however, that, whereas it is a simple matter to increase the power output of the engine, this increase in power must inevitably carry with it a tendency to reduce reliability. It is for this reason that the terms of the Warranty on a new M.G. expressly exclude any super-tuning of the kind described in this booklet, but this does not mean that tuning in this way will necessarily make the car hopelessly unreliable. In fact, it may be assumed that it will be at least as reliable as other cars of similar performance.

This booklet is laid out to give details for progressively increasing the power. With the above ideas firmly in mind, the owner should select the simplest tuning method which will give him the performance he requires, remembering all the time that here, as elsewhere, Power Costs Money.

Tuning hints are included for the racing enthusiasts who want to go to the limit and who have facilities to modify or make up special parts for their cars. We hope this section will be of use to them.

Owners are reminded that in certain countries noise restriction regulations are in force. The Company cannot therefore accept responsibility for any increase in the existing noise level of the car which may result after special tuning operations have been carried out. In Countries with air pollution regulations, modifications to the engine may prohibit the car from use on public roads.

Most competitive events are run under rules agreed by the F.I.A. which limit modifications for certain groups or categories. As soon as improvements are incorporated into production or become available as special parts, the necessary steps are taken to have these parts approved for competition and included on the homologation forms.


Getting the best from your ‘MGB’

  • Choice of fuel
  • Sparking plugs
  • Static ignition settings
  • The Dunlop centre-lock wheel

General data

  • Tuning
  • Ordinary road work
  • Stage 1 By port polishing
  • Stage 2 For middle-range acceleration
  • Competition
  • Stage 3 Compression ratio 9-6 to 9-8 : 1 (head machined)
  • Stage ЗА Compression ratio 9-6 to 9-8 :1 (flat top pistons)
  • Stage 3B Compression ratio 10-5 : 1 (head and pistons)
  • Stage 4 Compression ratio 9-6 to 9-8 : 1 (head and pistons)
  • Stage 5 Compression ratio 9-6 to 9-8 :1 (Weber carburetter)
  • Stage 6 Compression ratio 10-4 to 10-6 : 1 (Weber carburetter)

Other special items

  • Brakes
  • Carburetter (Weber)
  • Clutch
  • Crankshaft
  • Crankshaft bearings
  • Cylinder head gasket
  • Distributor
  • Dynamo
  • Exhaust system
  • Fuel pump
  • Gearbox (close ratios)
  • Gearbox (dipstick and oil seal)
  • Hand brake (fly-off)
  • Oil cooler
  • Oil filter
  • Oil pump
  • Oil sump
  • Rear axle ratios
  • Road springs
  • Road wheel and tyre—assembly balance
  • Shock absorbers
  • Sparking plugs
  • Timing chain sprockets
  • Torque wrench settings
  • Valves and guides
  • Valve springs
  • Water thermostat and fan

Competition equipment (list)
Optional extras

Language: English
Format: PDF
Pages: 25

MGB TOURER AND GT Special Tuning