IE B009TWO ACTS FROM ONE FLEET · 05.07.2001
LAZ and LIAZ engines: on both buses compression evened out, petrol use down
Cylinder compression evened out, weak cylinders came up to strong ones, fuel consumption dropped. 11–20 % — mean compression across 8 cylinders, 6.5–7.4 → 7.8–8.2 (2001).
signed and stamped by both parties
What repeated on both buses
| EQUIPMENT | MILEAGE AT START | WHAT WAS MEASURED | ACT DATE |
|---|---|---|---|
| LAZ bus, reg. No. N 140 RM | 45 889 km | Compression in each of the 8 cylinders, petrol consumption | 05.07.2001 |
| LIAZ bus, reg. No. N 821 NN | not stated | Compression in each of the 8 cylinders, petrol consumption | 05.07.2001 |
Compression by cylinder — both buses side by side
| CYLINDER | LAZ N 140 RM, BEFORE | LAZ, AFTER | LIAZ N 821 NN, BEFORE | LIAZ, AFTER |
|---|---|---|---|---|
| 1st | 6.4 | 7.4 | 6.0 | 7.8 |
| 2nd | 5.0 | 7.2 | 7.0 | 7.6 |
| 3rd | 4.9 | 7.5 | 7.0 | 8.5 |
| 4th | 6.7 | 8.0 | 8.0 | 9.0 |
| 5th | 7.0 | 8.0 | 7.5 | 8.0 |
| 6th | 7.6 | 8.6 | 8.0 | 8.0 |
| 7th | 6.5 | 7.8 | 8.0 | 8.0 |
| 8th | 8.0 | 8.0 | 8.0 | 9.0 |
The unit of compression is not stated in the acts — the values are carried over exactly as recorded. The gain came from the worn cylinders; those initially strong stayed at their own level.
Result for each bus
| BUS | MEAN COMPRESSION | GAIN | SPREAD BETWEEN CYLINDERS | PETROL CONSUMPTION |
|---|---|---|---|---|
| LAZ bus, N 140 RM | 6.5 → 7.8 | +20% | 3.1 → 1.4 | −5% |
| LIAZ bus, N 821 NN | 7.4 → 8.2 | +11% | 2.0 → 1.4 | −5% |
The 5% drop in petrol consumption is the summary figure taken from the conclusions of the acts themselves; the acts give no absolute consumption values.
What the acts recorded
Current equivalent
- Revitalizant gel for petrol enginesPetrol engines
- Revitalizant gel for cylinder restorationEngine cylinders, deep wear
How such units are treated:
About this result:
Limits of this report: The results relate to the petrol 8-cylinder engines of the LAZ and LIAZ city buses of the “Avtokolonna 1208” fleet; on other equipment and under other operating conditions the figures may differ. The treatment and control measurements were performed by “TEKHNOSERVIS Group” LLC, the contractor for the work.