Harley Twin Cam, 95 cu in, 3.880 over, 4.000 stroke, 11:1
Make
Harley Davidson
Engine Size
95 CI
Model
Twin Cam
Bore (in)
3.88
Stroke (in)
4
Comp Ratio
11.1:1
Dome CC
14.5
Comp Height
1.27
Piston Part Number
M5021
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, 95 cu in, 3.880 over, 4.000 stroke, 11:1
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 bore clearance for the M5021 pistons?
For the M5021 pistons, a typical bore clearance of 0.0025" to 0.0030" is recommended. However, this can vary based on specific engine conditions and operating temperatures, so it's essential to consult with your engine builder for precise specifications.
What type of ring end gap should I use with the M5021 pistons?
The ring end gap for the M5021 pistons should be set according to the supplied instructions, typically around 0.004" to 0.005" per inch of bore diameter. Ensure to verify the specific requirements based on your application and intended use.
Can I use the M5021 pistons with stock Harley Twin Cam conrods?
Yes, the M5021 pistons are designed to work with stock Harley Twin Cam conrods, but ensure that the conrods are in good condition and properly machined to maintain the necessary clearances and reliability.
What is the expected compression ratio with the M5021 pistons?
The M5021 pistons provide a compression ratio of 11.1:1 when used with the appropriate cylinder head and gasket combination. It's crucial to verify the entire assembly to ensure optimal performance and prevent detonation.
What material are the M5021 pistons made from?
The M5021 pistons are forged from high strength 2618 alloy, which offers excellent durability and performance characteristics suitable for high-performance applications.
