EDIS-4 Parts Required

Scrap Heap Challenge

The EDIS-4 parts were originally fitted to Ford Mondeos and Escorts in the UK . You need to source 3 parts as outlined below.

VR Sensor, Coil pack and toothed ring. It is possible to buy the sensor and the coil pack new, but you will pay a much higher price for them.  

If you buy Matthew's cable sets the connectors come pre-fitted. If you decide to go it alone and can salvage the connectors then all the better as it makes dismantling the system easier. However once the parts are installed it is unlikely you will want to remove them frequently. The alternative would be soldering the cable ends to coil pack, VR sensor although it is nice to be able to quickly remove them should you wish. Now rummaging around in a scrap yard is fun but if that doesn't take your fancy the the easy answer is to try eBay. Matthew has limited stock of all the parts required which are tested before despatch.

How it all fits together

Above is a diagram showing the essential parts to the system and how they are connected within the car.

VR Sensor

This connects via a 2M long lead to the box. It has to be mounted so that it points at the toothed ring with just a 2mm gap between the tooth and sensor. Mounting can be done via a fabricated bracket attached to the alternator mount or alternatively we have mounted it from one of the timing cover bolts. The best way to route the cable is down the left hand side of the engine bay (sparkplug side). You can then route it through whichever hole you fancy back to the EDIS4 MGB module. It has two connections which are polarity sensitive. Connect it the wrong way round and the system wont work at all.

Throttle Position Sensor 

The throttle position sensor is just a 5K variable resistor that can turn with the throttle spindle. Calibration can be done within the software package. You just have to make sure it can't slip. (i.e.) If the throttle turns 90 degrees so must the variable resistor. Mounting this on an SU carb is possible as documented by Martin Williamson on his 79 GT. It is included as part of the cable set being soldered and heat shrink sleeved onto the end of the TPS cable.

Cabling

The cabling and loom is an important part of the system and as such must be right. If you choose to buy the module you can either go it alone and do your own cables or buy Matthew's. There is very little in the price as the most expensive parts are the connectors. The module ends have locking connectors whilst the other ends are plugs, which mate the coil pack and VR sensor respectively.

Coil Pack 

The coil pack has 3 connections. The two outer ones go to the EDIS4 MGB module and the centre one to battery 12V. The HT leads can be purchased from Halfords. Ford Orion circa 95 fit quite well. Mounting can be achieved by using the 4 corner holes for fixing. The unit doesn't produce any significant heat and can be mounted between the heater box and the brake/clutch housing. Alternatively in any other area where the leads have an unimpeded path to the plugs. The unit appears to produce a much better spark than even a performance gold coil. For this reason you can open up the plugs a little. I prefer NGK plugs and run BP7es. Plugs should also last significantly longer because of the cleaner sparks.

Toothed Ring 

The toothed ring is a ring of 36-1 teeth mounted on the crank pulley wheel. One of the teeth is missing. This allows the system to synchronise and hence determine the timing. The original Ford's had this ring attached to the pulley wheel. In the case of the MG the ring is too small hence it can't easily be used. You could machine the pulley itself with suitable milling tools or make a simple toothed ring out of 1mm sheet steel. By far the easiest route would be to go direct to Trigger-wheels.com who can supply varying diameter pulleys with the 36-1 configuration and are able to offer a specific A-series pulley for Spridget owners.  

HT Leads 

Matthew can supply these. Alternatively leads for early Mondeos are about right for an MGB. Also custom leads are available from Halfords etc such as these below.

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