PRODUCTION TESTS|PASSENGER ROAD TRANSPORT|ENGINE · COMPRESSION
TEST REPORT ON XADO PRODUCTS AT A BUS DEPOT
PAZ buses: compression evened out with no engine teardown
PRODUCTXADO revitalizant gel
for petrol enginesstaged treatment, 6 doses · Antikoks decarbonizer · Vita Flush engine flush · XADO Atomic Oil 10W-40
for petrol enginesstaged treatment, 6 doses · Antikoks decarbonizer · Vita Flush engine flush · XADO Atomic Oil 10W-40
TEST OBJECTTwo PAZ buses in scheduled servicereg. no. A 944 ma and no. T 642 mkh · petrol eight-cylinder engines
DOCUMENT TYPEProduction test report,
approved by the PATP director
approved by the PATP director
Key results
compression evened out across the cylinders
↑3-17%
compression across the cylinders of engine A 944 ma, 9.5-11.2 → 10.0-11.2
| EQUIPMENT | CONDITION AT START OF TESTS | WHAT WAS MEASURED |
|---|---|---|
| PAZ bus, reg. no. A 944 ma | Engine in scheduled service, wear up to 80 % | Compression on all 8 cylinders, oil pressure |
| PAZ bus, reg. no. T 642 mkh | Engine in scheduled service, wear up to 80 %; cylinder 2 with collapsed compression | Compression on all 8 cylinders, oil pressure |
Compression by cylinder — both engines, before and after treatment
| CYLINDER | A 944 ma, BEFORE | A 944 ma, AFTER | T 642 mkh, BEFORE | T 642 mkh, AFTER |
|---|---|---|---|---|
| Cylinder 1 | 9.8 | 10.6 | 10.9 | 11.0 |
| Cylinder 2 | 10.4 | 10.5 | 5.8 | 10.5 |
| Cylinder 3 | 9.6 | 11.2 | 10.3 | 11.0 |
| Cylinder 4 | 10.5 | 10.9 | 11.0 | 11.5 |
| Cylinder 5 | 11.2 | 11.2 | 11.5 | 11.6 |
| Cylinder 6 | 9.6 | 10.4 | 11.3 | 11.3 |
| Cylinder 7 | 10.6 | 10.9 | 11.1 | 11.3 |
| Cylinder 8 | 9.5 | 10.0 | 11.8 | 10.8 |
| Spread between cylinders | 1.7 | 1.2 | 6.0 | 1.1 |
Pre-treatment measurements — 24.08.2007, control measurements — 06.09.2007; the unit of compression is not stated in the report.
Findings of the commission of PATP Stupino
The engines were running with wear of up to 80 %, and on bus T 642 mkh cylinder 2 held a collapsed 5.8 against 10.3-11.8 on the other seven: after treatment it came up to 10.5, with most of the gain arriving not on the day of treatment but over the following 13 days of ordinary scheduled service. The enterprise commission recorded: 1). The compression and oil pressure figures obtained after treating the engines with the XADO restorative compound indicate improved engine operation, despite their substantial wear over long service. 2). The effectiveness of XADO motor oil and revitalizant gels is confirmed not only by the engine parameters before and after treatment, but also by smoother engine running and by improved throttle response and power in service.
The results relate to petrol engines of PAZ buses that had used up a significant part of their service life, and to urban scheduled-service conditions; on other equipment the figures may differ. The original report is published in full and available for download. The treatment was carried out by the Moscow Representative Office of XADO LLC — the product supplier.
Current equivalent
- Revitalizant gel for cylinder restorationEngine cylinders, deep wear
- Revitalizant gel for petrol enginesPetrol engines
How such units are treated: