2017-2022 Harley Milwaukee Eight 139 ci, 4.500" bore, 4.375" stroke, 12.0:1 CR, 1.143" CH
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2017-2022 Harley Milwaukee Eight 139 ci, 4.500" bore, 4.375" stroke, 12.0:1 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 |
12.0:1 |
|
Dome CC |
-4.6 |
|
Comp Height |
1.143 |
|
Piston Part Number |
M5142 |
|
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) |
ROP |
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, 12.0:1 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 M5142 pistons?
For the M5142 pistons, the recommended bore clearance typically ranges from 0.0025" to 0.0035". However, exact clearances should be determined based on your specific engine build and intended use.
What type of rings are included with the M5142 piston kit?
The M5142 piston kit includes a set of three rings: 1-MG10-4505, 2-MS20-4505-THG, and 3-D30-4500-0. Ensure that you follow the manufacturer's specifications for installation and ring gap settings.
What is the compression ratio of the M5142 pistons, and how does it affect performance?
The M5142 pistons have a compression ratio of 12.0:1. This high compression ratio can enhance performance by improving power output, but it requires careful tuning and high-quality fuel to avoid detonation.
Are the M5142 pistons suitable for high-performance applications?
Yes, the M5142 pistons are designed for high-performance applications, featuring a forged 2618 alloy construction and double forced pin oilers. However, reliability and performance will depend on proper machining, clearances, and tuning.
What machining processes are necessary for the M5142 pistons?
Before installation, ensure that the cylinder bores are honed to the correct specifications for the M5142 pistons. Additionally, verify that the piston-to-cylinder clearance and ring gaps are set according to the supplied instructions for optimal performance.
