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Product Testings


University of Nantes
National College of Mechanics
E.M.S.M.
1 rue de la Noe - 4407 Nantes Cedex
Tel. : (40) 74.79.76

 


Technology and Production Techniques Department


Objective

To treat an engine with Xcel Plus Anti Wear Protection (originally tested under another private label) according to the established criteria, by the manufacturer and to measure all characteristics.

Test Performed

Test Engine

All test were made on a Renault type 841 engine with the builder's specifications concerning electromagnetic brakes on Foucalt currents Schenck W 70.

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

Carburetor ;   Weber 32 DIR 35 - double body differential
                        1st 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 between 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 ful load 
*  loss by mechanical friction at full load 
*  acceleration in speed regulation from least torque to greatest torque. 

The results are show on the following table:

Speed

Torque

Horsepower

Consumption

Loss by Friction

Accelerations

rpm

Nm*

hp

g/hp/h

 

 

2000

118.2

33.67

223.2

2.85

3.4

2500

123.2

43.85

211.1

3.92

5.0

3000

123.7

52.83

208.8

5.34

5.2

3500

122.2

60.90

204.6

8.47

6.0

4000

116.0

66.05

204.4

12.53

8.5

4500

108.4

69.42

207.4

16.34

5.8

5000

99.5

70.80

208.0

22.8

5.4

5500

88.6

69.35

225.1

---

5.3

*Nm = Mechanical efficiency

Test Performed
In view of these results, it can be stated that the characteristics of the test engine are an average of only 2% below manufacturer's specifications.

Treatment with Xcel Plus
Since the engine's crankcase has a capacity of 4 liters, treatment is made with one quart of Xcel Plus and 3 liters of IOGL 20w 40.

The duration of the treatment is established on a base of 5000 km for every 40 hours of bench tests distributed as follows:

City

20%

8 hours

Highway

45%

18 hours

Turnpike

20%

8 hours

Uphill

15%

6 hours

For purposes of the test, motor load conditions have been calculated from an R1152 body with a rolling weight of 1200 kg equipped with a 4 speed transmission.

Test of Treated Engine
The following table shows the characteristic curves on a treated engine under the same test conditions as the base engine:

Speed

Torque

Horsepower

Consumption

Loss by Friction

Accelerations

rpm

Nm*

hp

g/hp/h

 

 

2000

123.0

35.03

227.7

2.0

3.2

2500

130.9

46.61

209.8

2.0

4.6

3000

129.1

55.17

208.8

4.7

4.8

3500

127.1

63.35

201.5

7.0

5.3

4000

122.0

69.48

201.6

11.8

6.4

4500

113.8

72.91

205.5

15.7

5.2

5000

104.0

74.08

209.5

20.3

4.7

5500

92.2

72.25

221.5

---

5.0

 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.

Engine Torque

Speed

Base Nm

Treated Nm

G a

i n 

rpm

 

 

Nm

%

2000

118.2

123.0

4.8

4.0

2500

123.2

130.9

7.7

6.3

3000

123.7

129.1

5.4

4.4

3500

122.2

127.1

4.9

4.0

4000

116.0

122.0

6.0

5.2

4500

108.4

113.8

5.4

5.0

5000

99.5

104.0

4.5

4.6

5500

88.6

92.2

3.6

4.2

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 %
                                             Engine Horsepower HP

Speed

Base 

Treated Nm

G a

i n 

rpm

 

 

hp

%

2000

33.67

35.03

1.36

4.0

2500

43.85

46.61

2.76

6.3

3000

52.83

55.17

2.34

4.4

3500

60.90

63.35

2.45

4.0

4000

66.05

69.48

3.43

5.2

4500

69.42

72.91

3.49

5.0

5000

70.80

74.08

3.28

4.6

5500

69.35

72.25

2.90

4.2

Specific consumption at full load:

Specific Consumption g/hp/h

Speed

E n g

i n e

G a

i n

rpm

Base

Treated

g/hp/h

%

 

 

 

 

 

2000

223.2

227.7

-4.3

-4.3

2500

211.1

209.8

1.2

0.6

3000

208.8

208.8

0.0

0.0

3500

204.6

201.5

3.1

1.5

4000

204.4

201.6

2.8

1.4

4500

207.4

205.5

1.9

1.0

5000

208.0

209.5

-1.5

-0.7

5500

285.1

221.4

-3.7

-1.6

   The gain specific consumption either positive or negative, is negligible, remaining intrinsically at +0.43%, which may be attributed to measurement error or to test conditions. This is normal since Xcel Plus 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 at Full Load:

Losses By Friction  hp

Speed

E n g

i n e

G a

i n

rpm

Base

Treated

hp

%

2000

2.85

2.0

0.85

30

2500

3.92

2.0

1.92

49

3000

5.34

4.7

.64

12

3500

8.47

7.0

1.47

17

4000

12.53

11.8

.73

6

4500

16.34

15.7

.64

4

5000

22.8

20.3

2.5

11

   The gain is rather substantial and is established at an average of 16%, which implies an improvement is 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%; 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.

Acceleration at Full Load

Speed

E n g

i n e

G a

i n

rpm

Base

Treated

Seconds

%

2000

3.4

3.2

0.2

6

2500

5.0

4.6

1.6

32

3000

5.2

4.8

0.4

8

3500

6.0

5.3

0.7

12

4000

8.5

6.4

2.1

25

4500

5.8

5.2

0.6

10

5000

5.4

4.7

0.7

13

5500

5.3

5.0

0.3

6

 Thermal Limitation:  The bench test for horsepower show:
     *  An average increase of oil pressure of 0.5 bar.
     *  An Average decrease of oil temperature of 15 %.

   
This is explained by the fact that a film formed by treatment with Xcel PLus 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 on the adherent seats.
   It is evident by the fact that the motor oil working under less stress loses its qualities less quickly and will, therefore, last longer.

Conclusions:

In view of the results of the completed tests, we have come to the following conclusions:

         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 in 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 Xcel Plus) will work more efficiently and consume less.

Concerning increased acceleration, the treated engine consumes so much less that it's 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 Xcelplus Engine Protection 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

         longer periods between oil changes

         less wear and tear on the engine, especially during cold starts

         ease of starts increases, especially under winter conditions.

Nantes, 14 February 1979
M. Lemaire