2017-2022 Harley Milwaukee Eight 120 cu in, 4.125 bore, 4.500 stroke, 10.75:1 C/R, 1.080 C/H, -4 dome cc’s
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2017-2022 Harley Milwaukee Eight 120 cu in, 4.125 bore, 4.500 stroke, 10.75:1 C/R, 1.080 C/H, -4 dome cc’s
|
Make |
Harley Davidson |
|
Engine Size |
120 CI |
|
Model |
Milwaukee 8 2017-2022 |
|
Bore (in) |
4.125 |
|
Stroke (in) |
4.5 |
|
Comp Ratio |
10.75:1 |
|
Dome CC |
-4 |
|
Comp Height |
1.08 |
|
Piston Part Number |
BHM8120 |
|
Conrod Part Nmber |
PSR10087 |
|
Pint Part Number |
927-2250-20CP1C |
|
Locks Part Number |
927x073 SWL |
|
Rings |
1-N16-4125-0 2-N26-4125-OTHG 3-M38-4125 |
|
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 120 cu in, 4.125 bore, 4.500 stroke, 10.75:1 C/R, 1.080 C/H, -4 dome cc’s |
|---|---|
| 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 are the recommended clearances for the BHM8120 pistons?
For the BHM8120 pistons, it's crucial to follow the manufacturer's specifications for piston-to-cylinder clearance. Typically, a clearance of 0.0030" to 0.0040" is recommended for performance applications. Always verify with your specific engine build and consult the supplied instructions for optimal results.
What type of rings are included with the BHM8120 piston kit?
The BHM8120 piston kit includes a complete set of rings: 1-N16-4125-0, 2-N26-4125-OTHG, and 3-M38-4125. Ensure that you follow the ring end gap specifications provided in the instructions to achieve the best performance and reliability.
Can the BHM8120 pistons be used with stock Harley Davidson components?
While the BHM8120 pistons are designed for the Milwaukee Eight engine, compatibility with stock components depends on your specific build. Modifications may be necessary to accommodate the increased compression ratio of 10.75:1. Always consult with an experienced engine builder for advice tailored to your setup.
What is the significance of the -4 dome cc's on the BHM8120 pistons?
The -4 dome cc's on the BHM8120 pistons indicate a slight negative dome, which helps to lower the compression ratio compared to a flat-top piston. This design can improve combustion efficiency and reduce the risk of detonation, especially when running higher boost levels or tuning for performance.
What machining processes should be considered when installing BHM8120 pistons?
When installing BHM8120 pistons, ensure that the cylinder bores are honed to the correct diameter and finish as per the piston specifications. Additionally, check that the piston pin bores are properly sized and that the crankshaft is balanced with the complete rotating assembly to maintain engine reliability and performance.
