2017-2022 Harley Milwaukee Eight 139 ci, 4.500" bore, 4.375" stroke, 11.0:1 CR, 1.143" CH
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2017-2022 Harley Milwaukee Eight 139 ci, 4.500" bore, 4.375" stroke, 11.0:1 CR, 1.143" CH
|
Make |
Harley Davidson |
|
Engine Size |
139 CI |
|
Model |
Milwaukee 8 2017-2022 |
|
Bore (in) |
4.5 |
|
Stroke (in) |
4.375 |
|
Comp Ratio |
11.0:1 |
|
Dome CC |
-14.9 |
|
Comp Height |
1.143 |
|
Piston Part Number |
M5140 |
|
Conrod Part Nmber |
PSR10087 |
|
Pint Part Number |
927-2500-18CP1C |
|
Locks Part Number |
927x073 SWL |
|
Rings |
1-MG10-4505 2-MS20-4505-THG 3-D30-4500-0 |
|
Shelf (RPO) or Made to Order (MTO) |
MTO |
Proudly made in the USA by CP Carrillo Pistons!
- Fully CNC machined
- Balanced to +/- 1 gram
- Double forced pin oilers
- Forged from high strength 2618 alloy
- Designed for maximum performance, horsepower and reliability
- Complete kit includes two pistons, ring sets, wrist pins and clips
- Follow ring end gap and piston to cylinder clearances as per the supplied instructions
| Product Name | 2017-2022 Harley Milwaukee Eight 139 ci, 4.500" bore, 4.375" stroke, 11.0:1 CR, 1.143" CH |
|---|---|
| Brands | CP Carrillo |
Delivery & Freight
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What information do I need to match these pistons to my engine?
You need the engine code, bore size, stroke, rod length, pin diameter and target compression ratio. These determine the correct piston compression height and crown design.
How should ring gaps be set for these pistons?
Ring gaps must be set by your engine builder based on fuel type, boost level and the intended rpm range. Forced-induction engines usually require larger gaps.
Are forged pistons suitable for street engines?
Yes. Forged pistons handle detonation and high cylinder pressure better than cast units. Your builder should set the piston-to-bore clearance to suit your application.
What is the recommended bore clearance for the M5140 pistons?
The recommended bore clearance for the M5140 pistons should be determined by the engine builder based on the specific application and intended use. Generally, a clearance of 0.0025" to 0.0035" is common for performance applications, but always refer to the manufacturer's guidelines and adjust according to your engine's characteristics.
What type of alloy are the M5140 pistons made from?
The M5140 pistons are forged from high strength 2618 alloy, which is known for its excellent strength-to-weight ratio and thermal stability, making it suitable for high-performance applications.
What is the compression ratio of the M5140 pistons, and how does it affect performance?
The M5140 pistons have a compression ratio of 11.0:1. This higher compression can improve power output and efficiency, but it also requires careful tuning and high-quality fuel to prevent knocking, especially under boost conditions.
What components are included in the M5140 piston kit?
The M5140 piston kit includes two pistons, ring sets, wrist pins, and clips, providing everything needed for installation in the engine.
Do I need to perform any special machining for the M5140 pistons?
Yes, the M5140 pistons may require specific machining to ensure proper fitment, including setting the correct bore clearance and ring gaps. It's crucial to follow the supplied instructions and consult with your engine builder for optimal results.
