Harley Twin Cam, 103 cu in,3.880 bore, 4.375 stroke, 10.25:1
Make
Harley Davidson
Engine Size
103 CI
Model
Twin Cam
Bore (in)
3.88
Stroke (in)
4.375
Comp Ratio
10.25:1
Dome CC
1.4
Comp Height
1.092
Piston Part Number
M5024
Conrod Part Nmber
PSR6161
Pint Part Number
927-2500-15CP1C
Locks Part Number
927x073 SWL
Rings
RS111A-3880-0
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
More Information
Product Name
Harley Twin Cam, 103 cu in,3.880 bore, 4.375 stroke, 10.25:1
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 is the recommended piston to cylinder clearance for the M5024 pistons?
For the M5024 pistons, it's crucial to follow the manufacturer's specifications for piston to cylinder clearance. Typically, a clearance of 0.0025" to 0.0035" is recommended, but this can vary based on your specific engine build and intended use. Always consult the supplied instructions and adjust according to your engine's requirements.
What type of rings are included with the M5024 piston kit?
The M5024 piston kit includes RS111A-3880-0 ring sets. These rings are designed to provide optimal sealing and performance. Ensure you follow the manufacturer's guidelines for installation and ring gap settings to achieve the best results.
Can I use the M5024 pistons with a stock Harley Davidson Twin Cam engine?
Yes, the M5024 pistons can be used with a stock Harley Davidson Twin Cam engine, but modifications may be necessary to accommodate the increased compression ratio of 10.25:1. It's essential to evaluate your engine's current setup, including fuel quality and tuning, to ensure reliability and performance.
What is the weight of the M5024 pistons and how does it affect performance?
The M5024 pistons are designed to be lightweight, which aids in reducing reciprocating mass and improving throttle response. While the exact weight can vary, a lighter piston generally contributes to better performance, especially at higher RPMs. Balancing with the full rotating assembly is crucial to maintain engine harmony.
What is the significance of the dome CC for the M5024 pistons?
The dome CC of 1.4 for the M5024 pistons plays a critical role in determining the engine's compression ratio and combustion characteristics. This design helps optimise power output while ensuring compatibility with the Twin Cam engine's combustion chamber. Always consider this aspect when tuning your engine.
