Based on the Lucas distributor this CAS assembly has been developed to allow use the easy fitment of a multi toothed trigger wheel without the need to fit extra pulleys etc.

Multi toothed trigger wheels are used to provide accurate engine position information to the ECU for control of wasted spark ignition systems and correct timing of the fuel injectors.

Being based on a Lucas distributor body it should fit any vehicle that used either the 4 cylinder or 6 cylinder versions of the Lucas distributor with the normal offset drive dog.

With some minor modifications ( normally to clamp arrangements ) it can often be used to replace some of the Bosch 4 cylinder distributors as well.

It will work with any ECU capable of reading a 12-1 missing tooth wheel on the camshaft.

We have tested on the MaxxECU range of ECU’s

Most modern ECU’s can trigger from a camshaft source so it will probably work on various other ECU’s from Emerald, Link and Omex etc. but you will need to check the specification of your chosen unit to be sure.

Since this unit is driven from the original distributor drive please ensure that the original drive is serviceable without excessive free play.
If there is too much free play back and forth then the ECU may not read the trigger correctly.


This version retains the original rotor arm and distributor cap so the original method of distributing the ignition sparks using the rotor arm and distributor cap can be retained if desired or a wasted spark coil pack can be used if preferred.

Retaining the distributor rotor arm and capallows the vehicle to look more original but gives the benefit of timed and phased injector firing based on actual engine position.

Our other version is similar but does not retain the original rotor arm and distributor cap so will need to be used in conjunction with a wasted spark coil pack or similar.



Included in the package

Modified Lucas distributor fitted with 12-1 toothed wheel
Original rotor arm and distributor cap retained so original HT leads can be used.
Hall effect 12 volt sensor to read the toothed wheel position

Fitting Guide for a 4 Cylinder Distributor

Set engine to TDC # 1

Loosely fit CAS Distributor to engine with cap removed

Rotate CAS Distributor body until Rotor Arm aligns with one of the distributor cap towers sensor AND the missing tooth is 45 degrees before the rotor arm position.

If the sensor is not 45 degrees before the rotor arm then rotate distributor body until the sensor is 45 degrees before the rotor arm and the rotor arm is aligned with a cap tower.  This cap tower then becomes your #1 lead position, fit the remaining HT leads to match the correct firing order.
( this #1 lead position may or may not match the original lead position prior to fitment - as long as everything is aligned and ordered correctly this does not matter )

Lock CAS body to engine and then refit cap

This means the CAS system will then read the missing tooth 90 degrees crankshaft angle or 45 degrees camshaft angle before TDC

Set the ECU software so that First Tooth Angle ( sometimes called Initial Angle ) is 90 degrees referenced to crankshaft.
This first tooth angle within the ECU can then be adjusted up or down as required to ensure actual timing requested by ECU is observed using a timing lamp.
( most ECU's reference this angle as crankshaft angle but some may reference as camshaft angle )



Fitting Guide for a 6 Cylinder Distributor

For a 6 cylinder distributor follow the proceedure above EXCEPT the rotor arm will be 30 degrees before the rotor arm position.
Set the ECU First Tooth Angle to 60 degrees referenced to crankshaft.


We will supply these units with a 4 cylinder distributor cap.
In the related items list there is a 6 cylinder cap that will fit this distributor body