| ENGINE | MODEL/YEAR | PISTON SKIRT | FRICTION RATIO |
| 1 | Insight 2000 | molybdenum | 1.4% |
| 2 | Insight 2000 | graphite | 1.4% |
| 3 | Insight 2000 | electrolysis nickel | 2.0% |
| 4 | Insight 2000 | WPC treatment | 2.0% |
| 5 | Civic 2000 | WPC treatment | 2.2% |
| 6 | Odyssey 2000 | WPC treatment | 2.6% |
WPC has a significant improvement in fatigue strength over shot peening.
| TEST CONDITIONS |
| Rpm range | 7,640 |
| Oil grade | 5W-30 (sj) |
| Oil temp | 100 oc |
| Oil pressure | 0.1 Mpa |
| Clearance | 100-101 m |
| Load rate | 100kn/50 min. |
| Shaft rating | s45c (aisi 1045) |
| | Hrc 55 |
| | 0.2 Ra µm |
Test Results
Measurements were recorded when there was a sharp increase in temperature or the shaft rotational torque exceeded 30 nm.
| BEARING | RUN 1 | RUN 2 | AVE | TEMP |
| Stock Bearing | 54 | 66 | 60 | 160 C |
| WPC Treated Bearing | 68 | 76 | 72 | 200 C |
Metal Improvement Company
www.metalimprovement.com
201.843.7800
WPC Treatment
www.wpctreatment.com
310.782.8647
Shot Peening Advantages:
Greatly improves fatigue strength and stress corrosion fracture resistance.
Very cheap.
Many companies are very experienced with the process.
Readily available in most cities.
Great bang for the buck process.
Shot Peening Disadvantages:
Pebbly surface finish not suitable for bearing, seal, or close-tolerance areas.
Can distort close tolerance parts.
Can damage soft or fragile parts.
WPC Advantages:
Greatly improves fatigue strength and stress corrosion fracture resistance.
Improves surface hardness for reduced friction and improved wear resistance.
Improves surface smoothness for reduced friction and wear resistance.
Ultra-smooth surface is good for bearing, seal, or close-tolerance areas.
Does not distort close-tolerance parts.
Does not damage soft or fragile parts.
Not easily visible to the naked eye most of the time.
Can take the place of several different processes to save time and money; for instance, shot peening then coating.
WPC Disadvantages:
It costs more than shot peening.
The process is only available in one place in North America; parts to be treated must be shipped. WPC has good service and fast turnaround.
The process is secret so you just have to trust them!