IE S015THREE TECHNICAL MEASUREMENT REPORTS · JUNE 2000
PAZ-3205 bus engines: compression rose without teardown, CO emissions fell
Compression rose in all cylinders of both vehicles, spread narrowed, CO emissions dropped. 5.8–61.4 % — compression by cylinder, 5.6–9.0 → 6.9–10.1 kgf/cm²; 2.3–6.3× — CO content in the exhaust gases, 1.0–3.4 → 0.16–1.45 % (Russia · 2000).
operating parametersthree reports signed and stamped by the depot branch and by the contractor
What repeated on both vehicles
| BUS | MILEAGE AT START | MILEAGE AFTER TREATMENT | REPORT DATE | WHAT WAS MEASURED |
|---|---|---|---|---|
| PAZ-3205,<br/>V 233 MK | 95 427 km | 1542 km | 08.06.2000 | Compression on all 8 cylinders, running time on 100 g of petrol, oil pressure, CO and CH |
| PAZ-3205,<br/>V 233 MK | 95 427 km | 5866 km | 06.06.2000 | The same, plus oil pressure at 2000 rpm |
| PAZ-3205,<br/>E 441 MS | 36 156 km | 9892 km | 08.06.2000 | Compression on all 8 cylinders, running time on 100 g of petrol, oil pressure, CO and CH |
Cylinder compression — at each control measurement
| BUS · MILEAGE AFTER TREATMENT | BEFORE, kgf/cm² | AFTER, kgf/cm² | CHANGE |
|---|---|---|---|
| V 233 MK · 1542 km | 5.6–6.9 | 6.9–7.6 | +6–29 %, gain in all 8 cylinders |
| V 233 MK · 5866 km | 5.6–6.9 | 8.7–9.5 | +35–61 %, gain in all 8 cylinders |
| E 441 MS · 9892 km | 7.6–9.0 | 9.6–10.1 | +9–28 %, gain in all 8 cylinders |
The spread between cylinders narrowed from 1.3–1.4 to 0.5–0.8 kgf/cm²: the weakest cylinders caught up with the strongest, and the gain runs into the factory nominal value.
Fuel consumption — engine running time on a measured 100 g portion of petrol
| BUS · MILEAGE AFTER TREATMENT | BEFORE TREATMENT | AFTER TREATMENT |
|---|---|---|
| V 233 MK · 1542 km | 2 min 36 s | 3 min 24 s |
| E 441 MS · 9892 km | 3 min 9 s | 4 min 13 s |
On one and the same measured portion of petrol the engine runs longer — the same work takes less fuel.
Exhaust gas toxicity
| BUS · MILEAGE AFTER TREATMENT | CO, BEFORE → AFTER, % | CH, BEFORE → AFTER, ppm | CO / CH REDUCTION |
|---|---|---|---|
| V 233 MK · 1542 km | 1.0 → 0.18 | 2400 → 1600 | 82 % / 33 % |
| V 233 MK · 5866 km | 1.0 → 0.16 | 2400 → 1400 | 84 % / 42 % |
| E 441 MS · 9892 km | 3.4 → 1.45 | 2100 → 1200 | 57.4 % / 42.8 % |
The reduction percentages are given exactly as recorded in the conclusions of the reports themselves; the source pairs of values stand alongside.
Oil pressure in the lubrication system
| BUS · MILEAGE AFTER TREATMENT | MODE | BEFORE | AFTER |
|---|---|---|---|
| V 233 MK · 1542 km | Idle speed, 80 °C | 0.2 kgf/cm² | 0.35 kgf/cm² |
| V 233 MK · 5866 km | Idle speed, 80 °C | 0.2 kgf/cm² | 0.5 kgf/cm² |
| V 233 MK · 5866 km | 2000 rpm | 0.4 kgf/cm² | 1.8 kgf/cm² |
| E 441 MS · 9892 km | Idle speed, 80 °C | 0.7 kgf/cm² | 1.0 kgf/cm² |
Higher oil pressure on a warmed-up engine is a sign of restored clearances in the pump: it holds pressure again.
What the reports record
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 refer to the petrol engines of PAZ-3205 buses of the Mostransavto branch “Avtokolonna 1785” at the stated mileages; on other equipment and under other operating modes the figures may differ.