Pairs well with
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Product Features and Design
- 2618 Low-silicon / High expansion alloy for High HP/Boost applications
- Round skirt design with a bottom reinforcing band
- 3D under-crown milling to ensure minimal weight without compromising strength.
- 3D milling on piston crowns for ready-to-install finish
- Oversize valve pockets for larger than-stock valves and clip cuts on the edge of the pistons
- Window milling reduces the piston's overall weight while maintaining its strength and structural integrity
- Lateral gas ports for better ring seal
- Offset pins for quiet operation
- Molly Skirt coating for friction minimization and skirt wear protection
- Premium 8620 series pins from 1018 mild steel
*Optional Tool steel H-13 alloy wrist pins available as an upgrade. Part number H8662250225C wall thick. 5.72mm.
Diamond pistons are engineered with only one thing in mind: Winning races! They are manufactured in the USA from 2618 materials.
Diamond racing company is known since the late 60s to produce the highest quality engine parts around. For the past 2 decades, Diamond has solely dedicated itself to manufacturing forged pistons.
With all state-of-the-art machinery, they offer customers the state of the industry in machining.
The Coordinate Measuring Machine (CMM) is one of several sophisticated pieces of measuring and modeling apparatus used in Diamond¡¯s engineering department. The CMM provides very accurate measurements, measuring the location and details of valve pockets, for example, to within a .0001in.
This laser scanner is used for modeling purposes, especially for scanning piston domes where it scans thousands of surface points in minutes.
Developing the highest quality pistons in the industry by using the latest CNC machinery and computer software aids, as well as providing unmatched quality control.
With these credentials, it was only a matter of time before we decide that this is the firm to work with for making?unlimited power!
| Product Specifications | Details |
|---|---|
| Item Number | 38118-4 |
| Engine Make | Audi/Volkswagen |
| Bore | 82.5mm |
| Stroke | 92.8mm |
| Rod | 5.669 |
| Comp Height | 1.165 |
| Weight | call |
| Pin | .9055 x 2.250 |
| CC | -7.5cc |
| Comp Ratio | 9.5 |
| Cylinder Head Chamber CC | 45 |
| Ring Thickness | 1.0mm x 1.2mm 2.8mm |
| VP Intake Depth | 0.125 |
| VP Exhaust Depth | 0.095 |
| Cylinders | 4 |
| Barcode ID | 686162215416 |
| Class | DIA-ASC-PSSK |
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Common questions
FAQ
Fitment is confirmed for the applications listed in the Specs section above. Always confirm final fitment by year, market, and supporting hardware before ordering.
Yes. A professional calibration is required to safely control boost, fueling, torque limits, and thermal management.
Fueling, charge-air cooling, intake flow, downpipes, and drivetrain upgrades may be required depending on target power and fuel type.
The system is engineered for strong response, but daily drivability depends on calibration, fuel quality, supporting parts, and installation quality.
Warranty coverage applies to manufacturing defects under normal installation and operating conditions. Track use and improper calibration may affect coverage.
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