Revision as of 19:42, 26 April 2008

The Ford EDIS (Electronic Distributorless Ignition System) is a computer-controlled ignition system that can operate independent of an ECU. This makes it a great low cost system for swaps. The parts are unbundant in American wrecking yards. The 4-cylinder version of EDIS is used on with 1.9 liter CVH engine in the 1990-1993 Ford Escort and Mercury Tracer, US models. You can make your own crankshaft wheel, or adapt one from the Escort, Mustang, Taurus or other Ford models. Unlike other similar system that require a Camshaft Phase Sensor, this uses a simple crankshaft toothed wheel. It is a wasted spark system. This system has been succesfully used on vintage Beetles, recent BMWs, Datsun Roadsters and just about everything else.

The parts from the wreckers needed are about $25-$100:

Crank wheel trigger
Crank sensor
EDIS module with a bit of the wiring
4-tower coil pack
Spark plug wires

About $70 on Ebay for all the above

A brand new EDIS module with wiring connector is about $200.

Using EDIS alone, it outputs a fixed spark timing of 10 degrees BTDC. You can drive the car like this! But it won't be very fuel efficient or particularly powerful. Using a relatively simple timing controller ($89 kit) completes the picture. Optionally you can program an entire spark curve map using a standard PC.

MegaJolt Lite Jr Complete kit (MAP sensor option) $89 USD

For detailed technical information, see Ford EDIS technical information

Our own club member sundat1200 has used EDIS on a 1975 VW Rabbit and a 2002 BMW with "great success"

1 Crank Trigger Wheel
- 1.1 Dimensions
2 A-series Kit
3 Parts

Crank Trigger Wheel

The trigger wheel on the crankshaft has 36 teeth, with one missing -- the 36-1 style. Any wheel of this style can be used.

You can make your own crankshaft wheel out of sheet metal
or adapt one from the Escort, Mustang, Taurus or other Ford models
Ford UK trigger wheel Part No 1078767 is only 13 UK Pounds, and can be glued or bolted to most crank pulleys

For many details, see KEW Engineering

Dimensions

Datsun A-series crank pulley is 5.5 inches (139 mm) outside diameter.

The Escort/Tracer wheel (as shown in photo above)

144.30 mm OD
102.80 mm ID
9 mm thick at teeth, 7mm thick where it meets the flange
Cast iron hub: ~28mm crankshaft diameter

To fit this wheel:

Using a hacksaw, cut the trigger wheel from the pulley hub. I think it is cast iron. This leaves the wheel on a flat part of the hub. If the cut is not straight, grind/file it flat so that it is correctly balanced.
With the 139mm A-series pulley, just take two extra pulley bolt washers to space the wheel in front of the pulley. There is no room to mount it behind the pulley.
- Stock A-series pulley bolt washer is 34.5mm OD, 0.64 in (16.2mm) ID, 8mm thick.
  - Part Number: 12308-H1000 ($1.25)
- They can be bigger on Outside Diameter if needed.
Fit a spacer inside the Escort pully hole:
- ID: 0.61 in (15.5mm)
- OD: 1.07 in - 1.09 in (27.1 - 27.6 mm).
  You may need to drill/file the hole out a touch to fit over the bolt
- no more than 0.37 in. (9.3 mm) thick.
- Drill the ID (0.54 in) out using a 19/32 in drill bit to fit tightly over the bolt. Some filing with a round file will be needed. This is just to fit the pulley laterally. The Bolt will fasten it tight. Better yet, have a machinest make a tidy aluminum spacer.
Fit the longer pulley bolt and the last washer.

The stock A-series crankshaft pulley bolt is:

Stock Part Number: 12309-78200 ($4.58)
M16 x 1.50 (fine) pitch
15mm diameter
27mm long
The head is 27mm hex and about 15 mm thick.

The new pulley bolt needs to be 55 mm long.

M16 x 1.50 x 55 mm. ($3.15)

Will Grade 8.8 be OK? Or does it require Grade 10.8?

UK Ford pulleys

160mm OD
120mm OD

Too small for the a-series I think.

Mustang wheels are one piece with the crank hub.

Taurus 3.8 Turbo wheels are smaller diameter than the A-series pully:

120.65 mm (4.75 in) OD
70.36 mm (2.77 in) ID

A-series Kit

For the standard Escort pulley, use hacksaw to separate the grooved-belt section from the toothed section. You will end up with a steel hub with toothed aluminum wheel.

Use a bushing like this, a machine one from solid aluminum. This bushing is a standard 5/8 inch type. Pound the flange a bit to enlarge it. A longer crank bolt fits.

make a plate to bolt the sensor to the front of the engine. Sensor-to-tooth clearance is 0.040 inch or less.
This sensor is from a Ford Aerostar van

Audio of first run (timing retarded, but very strong and smooth spark): FLV flash video (202k)

Parts

FORD EDIS-4 from 1990 Escort/Tracer 1.9L. Part Number: F1CZ-12K072-A
new Accel 4-Tower coil pack $56.95 at Summit Racing]

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EDIS

Revision as of 19:42, 26 April 2008

Contents

Crank Trigger Wheel

Dimensions

A-series Kit

Parts