IE A015TECHNICAL REPORTS, KhMPATP No. 3 · NOVEMBER – DECEMBER 2001
Ikarus 280 and LiAZ 677: compression increased on both engines
Compression rose on both engines, the weakest cylinders came up to the common level. 8.3–40 % — compression by cylinder, Ikarus 280, 25–27 → 28–30 kgf/cm²; gain in 13 of 14 measurements; the rest unchanged; 8.3–40 % — compression by cylinder, LiAZ 677, 5.0–6.0 → 6.0–7.0 kgf/cm²; gain in 13 of 14 measurements; the rest unchanged (2001).
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Key results
| VEHICLE | ENGINE | TREATMENT → REPEAT MEASUREMENT | WHAT WAS MEASURED |
|---|---|---|---|
| Ikarus 280 bus, fleet No. 532 | Diesel, 6 cylinders, No. 101490218 | 9 Nov 2001 → 6 Dec 2001, mileage 2063 km | Compression in all cylinders |
| LiAZ 677 bus, fleet No. 609 | 8 cylinders | 9 Nov 2001 → 26 Nov 2001, mileage 2987 km | Compression in all cylinders |
Result for each vehicle
| VEHICLE | ENGINE | COMPRESSION BEFORE, kgf/cm² | AFTER, kgf/cm² | GAIN BY CYLINDER |
|---|---|---|---|---|
| Ikarus 280, fleet No. 532 | Diesel, 6 cylinders | 25–27 | 28–30 | +11–16 % |
| LiAZ 677, fleet No. 609 | 8 cylinders | 5.0–6.0 | 6.0–7.0 | +8–40 % |
The absolute levels of the two engines are not comparable with each other: the gain in each cylinder is what should be compared.
Compression by cylinder — both engines
| VEHICLE | CYLINDER | BEFORE, kgf/cm² | AFTER, kgf/cm² | CHANGE |
|---|---|---|---|---|
| Ikarus 280, fleet No. 532 | 1 | 26 | 29 | +11.5 % |
| Ikarus 280, fleet No. 532 | 2 | 27 | 30 | +11.1 % |
| Ikarus 280, fleet No. 532 | 3 | 25 | 29 | +16.0 % |
| Ikarus 280, fleet No. 532 | 4 | 26 | 29 | +11.5 % |
| Ikarus 280, fleet No. 532 | 5 | 25 | 28 | +12.0 % |
| Ikarus 280, fleet No. 532 | 6 | 25 | 28 | +12.0 % |
| LiAZ 677, fleet No. 609 | 1 | 6.0 | 6.5 | +8.3 % |
| LiAZ 677, fleet No. 609 | 2 | 5.5 | 7.0 | +27.3 % |
| LiAZ 677, fleet No. 609 | 3 | 5.0 | 7.0 | +40.0 % |
| LiAZ 677, fleet No. 609 | 4 | 6.0 | 6.5 | +8.3 % |
| LiAZ 677, fleet No. 609 | 5 | 5.0 | 7.0 | +40.0 % |
| LiAZ 677, fleet No. 609 | 6 | 6.0 | 6.0 | 0 % |
| LiAZ 677, fleet No. 609 | 7 | 6.0 | 7.0 | +16.7 % |
| LiAZ 677, fleet No. 609 | 8 | 6.0 | 7.0 | +16.7 % |
The more worn the cylinder, the larger the gain: in the LiAZ cylinders that started at 5.0 kgf/cm², compression rose by 40 %.
Conclusion for the series
Current equivalent
- Revitalizant gel for diesel enginesDiesel engines
- 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 apply to the Ikarus 280 and LiAZ 677 bus engines in city service at KhMPATP No. 3, Khabarovsk; on other equipment and under other duty cycles the figures may differ.