Lucas Service Training Centre
Petrol Injection Mk II

14. BENCH TESTING INJECTORS

 

To check injector opening pressure a test rig will be necessary on which the line pressure can be varied from 0—100 lbf/in2 (0—689.50 kN/m2).

 

Calibration Fuel

Fawley White Spirit ‘100’ plus 50 parts per million

Santolene ‘C’ or Shell Calibrating Fluid ‘C’.

The procedure is as follows:

(i) The injector should first be flow tested (flow rate 50—60 g.p.h.) at 100 lbf/in2 (689.50 kN/m2). During this test the needle must vibrate freely off its seat, and the injector must produce an evenly distributed cone of fuel at an angle between 55 and 65 degrees

(ii) Flow injector with applied pressure of 100 lbf/in2 (689.50 kN/m2), and gradually reduce to zero. Use air blast to remove fuel from nozzle tip. Increase applied pressure to 40 lbf/in2 (275.80 kN/m2), and check time taken for a droplet to appear at injector tip. This should not be less than 60 seconds.

(iii) Flow injector with applied pressure 100 lbf/in2 (689.50 kN/m2), and gradually reduce pressure to zero. Use air blast to remove fuel from nozzle tip. Increase applied pressure and note pressure at which injector sprays, this should be between 45 and 55 lbf/in2 (310.26—379.21 kN/m2).

 

 

15. HOW TO INHIBIT A CAR FITTED WITH LUCAS ‘P1’ EQUIPMENT

One cubic-centimetre (cc) of Santolene ‘C’ should be mixed with 30—50 cc of kerosene. (Because there is a small quantity of inhibitor, it must be mixed with a carrying agent before being admitted to the petrol tank).

Add the Santolene mixture to the petrol in the petrol tank. (The mixture is sufficient to inhibit 5 gallons (22.73 litres) of petrol. The car should then be driven for approximately 5 miles to ensure the mixture is distributed through­out the ‘PI’ system.

16. QUICK CHECK OF FUEL FLOW RATE

Arrange for the fuel to flow into a container, graduated in cubic centimetres (cc), for a period of 8 seconds. Divide the quantity collected by 10, the result is gallons per hour.

Quantity collected (cc)
___________________ = galls. per hour
              10

 

 

17. EQUIVALENTS

1 cc is approx. equal to 1/2  teaspoon or 20 drops.
1 gallon = 4543.5cc
1 pint = 1.76 litres
1 litre = 1000cc or 1000ml (milli-litres)

 

 

Page 30
Click here to go to page 31

Click here to go to the table of contents