Features
- Speed of Air Technology
- Thermal Barrier coated crown
- M42 skirt Coating
- Total Seal 2nd Ring
Speed of Air® (SoA) Engine Technologies has developed patented technology to enhance the efficiency of medium-duty Cummins®, Powerstroke® and Duramax® engines, providing measurable performance and fiscal benefits. SoA’s patented piston treatment on its Hyperformance Pistons™ provides increased torque, horsepower, reduced emissions and greatly improved fuel efficiency.
These improvements also contribute significantly to extending engine life and reducing service intervals. The fuel savings alone, documented by independent commercial users, are as much as 25 percent and more, a critical aspect for fleets facing higher fuel prices.
Product Specifications
| Sold As | Piston & Ring Kit |
|---|---|
| Engine Manufacturer | Cummins |
| Engine Family | 3.9L 8V 4BT 1984-1998 |
| OE Assembly | 3802493 |
| Year Range | 1994-1998 |
| Bore (in) | 4.015 |
| Bore (mm) | 102 |
| Stroke (in) | 4.724 |
| Stroke (mm) | 120 |
| Eng. Disp. Liters | |
| Eng. Disp. In. | |
| Oversizes | STD .50mm .75mm 1.0mm |
| Rod (in) | 7.56 |
|---|---|
| Rod (mm) | 191.97828 |
| Compression Height IN | 2.818 |
| Compression Height MM | 71.6 |
| Crown (cc) | +44.2cc |
| Compression Ratio | 17.5:1 |
| Pin Type | Floating |
| Pin Diameter (in) | 1.575 |
| Pin Diameter (mm) | 40 |
| Ring Pack | 3.0K, 2.35mm, 4.0mm |
| Piston Material | |
| Top Land | 0.318 |
DEAN M.
"The engine runs great so far, but we haven't gotten it fully broken in yet. So far it is getting 22mpg highway and no smoke. EGTs are nothing to worry about at all even when towing. My son was impressed we were getting 18mpg running over 80mph across Utah. I will be happy to keep you updated on mileage and performance once the engine is fully broken in."
