2017-2022 Harley Milwaukee Eight 107 cu in, 3.937 bore, 4.375 stroke, 11.0:1 C/R, 1.143 C/H, 8.7 dome cc’s
Make
Harley Davidson
Engine Size
107 CI
Model
Milwaukee 8 2017-2022
Bore (in)
3.937
Stroke (in)
4.375
Comp Ratio
11.0:1
Dome CC
8.7
Comp Height
1.143
Piston Part Number
BHM8107-9
Conrod Part Nmber
PSR10087
Pint Part Number
927-2500-20CP1C
Locks Part Number
927x073 SWL
Rings
CPN-3937
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
More Information
Product Name
2017-2022 Harley Milwaukee Eight 107 cu in, 3.937 bore, 4.375 stroke, 11.0:1 C/R, 1.143 C/H, 8.7 dome cc’s
Brands
CP Carrillo
Delivery & Freight
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Disclaimer:
Product images are for description purposes only. Actual product may vary.
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 BHM8107-9 pistons?
For the BHM8107-9 pistons, it's crucial to follow the manufacturer's guidelines for piston-to-cylinder clearance. Typically, a clearance of 0.0035" to 0.0045" is recommended for forged pistons, but this can vary based on your specific build and application. Always consult your engine builder for precise measurements.
What type of rings are included with the BHM8107-9 piston kit?
The BHM8107-9 piston kit includes CP rings, specifically part number CPN-3937. Ensure you follow the manufacturer's specifications for ring gap settings to achieve optimal performance and reliability.
What is the compression ratio of the BHM8107-9 pistons and how does it affect performance?
The BHM8107-9 pistons have a compression ratio of 11.0:1. This higher compression ratio can enhance performance by improving thermal efficiency and power output. However, it requires careful tuning and high-quality fuel to avoid knock and ensure reliability.
What material are the BHM8107-9 pistons made from?
The BHM8107-9 pistons are forged from high-strength 2618 alloy, which provides excellent durability and performance under high-stress conditions. This material is well-suited for applications requiring increased horsepower and reliability.
Can the BHM8107-9 pistons be used in a stock Harley Milwaukee Eight engine?
Yes, the BHM8107-9 pistons can be used in a stock Harley Milwaukee Eight engine, but modifications may be necessary to accommodate the higher compression ratio. It's essential to ensure proper tuning and check for any clearance issues with existing components.
