UNIVERSITY OF NANTES
NATIONAL COLLEGE OF MECHANICS, E.M.S.M.
1 rue de la Noe - 44072 NANTES CEDEX
Tel.: (40) 74.79.76.
Technology and Production
Techniques Department

N/Ref.: TTPLM/AD/270-79

Engine and Machinery Laboratory


OBJECTIVE

To treat an engine with BISHOP´S ORIGINAL ANTI WEAR ENGINE PROTECTION according to the established by the 
manufacturer and to measure all characteristics.

TEST PERFORMED

Test engine

All test were made on a RENAULT type 841 with the builder´s specifications concerning  electromagnetic brakes on Foucault
currents SCHENCK W 70

The basic settings were :  Bore : 79 mm   Stroke: 84 mm  Head of Cylinder Preasure:       821

Carburetor :  WEBER 32 DIR 35 - double body differential
                      1 st body : venturi    24 mm - main jet 140
                                        correction jet  165
                      2nd body : venturi   24 mm  - jet 132
                                        correction jet 185

Ignition :      Points                DUCELLIER  R 254 D 60
                   Spark Plug         LODGE 2IILNY
                   Coil                    DUCELLIER  Competition 14 KV

The motor oil used shall be a commercial oil:  IGOL   20 W 40

At the beginning of the test, the engine registered about 400 hours of bench tests of which 80% were at full load. This  would be
equivalent of betveen 30,000 and 40,000 kilometers.

To be effective, the treatment should be made on an engine with a minimum of 20-25,000 kilometers. This condition is required.

Measurement of test engine:

The following characteristic curves are traced.
* torque at full load
* horsepower at full load
* specific consumption at full load
* loss by mechanical friction at full load
* acceleration in speed regulation from least torque to greatest torque

The results are shown on the following table:

NOTE:  Nm = Mechanical Efficiency

TEST PERFORMED
In view of these results, it can be stated thet the characteristics of the test engine are an average of only 2% below manufacturer´s specifications.

Treatment with BISHOP´S ORIGINAL

Since the engine´s crankcase has a capacity of 4 liters, treatment is made with 1 quart of BISHOP´S ORIGINAL and 3 liters of IGOL 20 W 40.

The duration of the treatment is established on a base of 5 000 km for every 40 hours of bench tests distributed as follows:

For purposes of the test, motor load conditions have been calculated  from an R1152 body with a rolling weight of 1 200 kg equipment with a 
4-speed transmission (gear ratio-- 1st = 2.26; 3rd = 1.48; 4th = 1.03) with a 9x34 torque and 165x14 wheels.

Test of treated engine:

The following table shows the characteristic curves on a treated engine under the same test conditions as he base engine:

COMPARATIVE RESULTS

Engine torque at full load:

As these comparative results show, the torque increase is very clear and is established at an average of 4.7% which will provide the 
greatest flexibility of use accompanied by better acceleration.

Horsepower furnished at full load:

Here again one finds the same gain in percentage as for the torque curves since horsepower is the torque product per speed.

The average gain is 4.7 percent.

Specific consumption at full load:

The gain specific consumption, either positive or negative, is negligible, remaining intrinsically at +0.43%, which may be
atributed to measurement error or to test conditions. This is normal since BISHOPˇS ORIGINAL treatment is used for
lubrication. The volumetric and combustion yields remain identical, treatment or no, which implies an identical specific 
consumption.   

The specific consumption is the consumption per horsepower per hour and is expressed in grams.     

Losses by Mechanical Friction in Full Load:

The gain is rather substantial and is established at an average of 16 percent, which implies an improvement in lubrication
of all moving parts.
This, of course, explains the gains obtained in torque and power, starting with an increase in mechanical output.

Acceleration at Full Load:

The gain obtained on the average was 14 percent; this being a result of the improvement in mechanical output.

With the given regimen, the establishment of the greatest available torque being faster, the rise during testing will also be
faster at full load.

Thermal limitation:  The bench tests for horsepower show
      * An average increase of oil pressure of 0.5 bar
      * An average decrease of oil temperature of 15 percent    

This is explained by the fact that a film formed by tratment with Bishop´s Original Formula 101 is effectively spread on the 
moving parts. Thereby reducing the play, permitting the increase of pressure and reducing internal friction of the oil film 
on the adherent seats.

It is evident that the motor oil working under less heat stress loses its qualities less quickly and will, therefore, last longer.

CONCLUSIONS

In wiew of the results of the completed tests, we have come to the following coclusions:
- improvement of mechanical output through reduced friction due to the improvement of lubrication
- improvement of engine torque and available  horsepower
- improvement of acceleration
- decrease of oil used
- reduction of fuel consumption 
 This last point deserves explanation. We have seen torque, horsepower and acceleration increase while specific 
consumption remains unchanged.

Actual consumption on automobiles is usually expressed in liters per 100 kms and is determined by the following factors
which affect the performance of each engine:

- engine load (acceleration position)
- properly tuned engine
- the vehicle´s speed - aerodynamic design of the vehicle and atmospheric conditions

Thus, at equal horsepower, a better performing engine( such as one treated with BISHOP´S ORIGINAL) will work more 
efficiently and consume less.

Concerning increased acceleration, the treated engine consumes so much less that its acceleration is faster (greater 
horsepower is used for a shorter period).

Although these test results apply only to the laboratory tested engine, and actual consumption cannot be measured, similar
 results may be expected under normal driving conditions.

Under average usage, a single treatment with BISHOP´S ORIGINAL will provide a substantial savings due to improved engine
efficiency and lubrication caused by the following factors:

- a decrease in fuel consumption during normal use
- a longer period between oil changes
- less wear and tear on the engine, especially under winter conditions.

NANTES, 14 February 1979

M. LEMAIRE

Copyright © B ORIGINAL Designed by MK 2006