IE A013TWO TECHNICAL REPORTS · DECEMBER 2001 — JULY 2002
GAZ 31029 and IKARUS-263: piston-group compression rose, cylinder spread narrowed
Compression rose in all cylinders of both vehicles, cylinder-to-cylinder spread narrowed. 2.9–66.7 % — compression across the cylinders, GAZ 31029 6.6 → 7.2 · IKARUS-263 17.0 → 24.5 kgf/cm² (2002).
of MUPP “Ekspress”signed by the commission, approved by the director of the enterprise, with stamps
What repeated on both vehicles
| VEHICLE | MILEAGE AT START | OBSERVATION PERIOD | WHAT WAS MEASURED |
|---|---|---|---|
| GAZ 31029 · reg. no. S656MKh | 65,494 km | 20.12.2001 — 14.02.2002 · 6,506 km | compression in 4 cylinders, fuel consumption at idle |
| IKARUS-263 · reg. no. S 712 OS 26 | 444,938 km | 28.02.2002 — 23.07.2002 | compression in 6 cylinders |
Compression across the cylinders — both vehicles
| VEHICLE | CYLINDER | BEFORE | AFTER | CHANGE |
|---|---|---|---|---|
| GAZ 31029 · S656MKh | 1 | 6.5 | 7.5 | +15.4 % |
| GAZ 31029 · S656MKh | 2 | 6.0 | 7.0 | +16.7 % |
| GAZ 31029 · S656MKh | 3 | 7.0 | 7.2 | +2.9 % |
| GAZ 31029 · S656MKh | 4 | 7.0 | 7.2 | +2.9 % |
| GAZ 31029 · S656MKh | average | 6.6 | 7.2 | +9.1 % |
| IKARUS-263 · S 712 OS 26 | 1 | 20.0 | 24.0 | +20.0 % |
| IKARUS-263 · S 712 OS 26 | 2 | 15.0 | 25.0 | +66.7 % |
| IKARUS-263 · S 712 OS 26 | 3 | 16.0 | 25.0 | +56.3 % |
| IKARUS-263 · S 712 OS 26 | 4 | 17.5 | 26.0 | +48.6 % |
| IKARUS-263 · S 712 OS 26 | 5 | 15.0 | 23.0 | +53.3 % |
| IKARUS-263 · S 712 OS 26 | 6 | 18.5 | 24.0 | +29.7 % |
| IKARUS-263 · S 712 OS 26 | average | 17.0 | 24.5 | +44.1 % |
IKARUS-263 compression is given in kgf/cm²; the GAZ 31029 report does not state the unit, so the two vehicles are compared by relative gain.
Evenness of engine operation
| VEHICLE | SPREAD BEFORE | SPREAD AFTER | CHANGE |
|---|---|---|---|
| GAZ 31029 · S656MKh | 1.0 | 0.5 | −50 % |
| IKARUS-263 · S 712 OS 26 | 5.0 | 3.0 | −40 % |
The spread is the difference between the best and the worst cylinder on the same date. The largest gain came from the cylinders that stood below the rest: the coating builds up where the wear is.
Fuel consumption at idle — GAZ 31029
| VEHICLE | PARAMETER | BEFORE | AFTER |
|---|---|---|---|
| GAZ 31029 · S656MKh | Engine running time on 100 ml of petrol | 3 min 15 s | 4 min 16 s |
Measured with a 100 ml graduated cup: the longer the engine runs on the same volume, the lower the fuel consumption at idle.
Findings of the commission
Current equivalent
- Revitalizant gel for diesel enginesDiesel 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 engines of a GAZ 31029 passenger car and an IKARUS-263 bus operated by an urban passenger transport enterprise; on other machines and duty cycles the figures may differ. RVS is an obsolete XADO designation, the zero-generation compounds; the current generation of products are revitalizants.