Harley Twin Cam, 88 cu in, 3.760 bore, 4.000 stroke, 9.75:1
Make
Harley Davidson
Engine Size
88 CI
Model
Twin Cam
Bore (in)
3.76
Stroke (in)
4
Comp Ratio
9.75:1
Dome CC
9.3
Comp Height
1.27
Piston Part Number
M5012
Conrod Part Nmber
PSR6161
Pint Part Number
927-2500-15CP1C
Locks Part Number
927x073 SWL
Rings
RS1110-3760-0
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, 88 cu in, 3.760 bore, 4.000 stroke, 9.75:1
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 M5012 pistons?
For the M5012 pistons, a typical bore clearance of 0.0025" to 0.0035" is recommended. However, it's crucial to consult your engine builder for specific requirements based on your application and machining tolerances.
What type of ring end gap should I use with the M5012 pistons?
The ring end gap for the M5012 pistons should be set according to the supplied instructions, typically around 0.004" to 0.005" per inch of bore diameter. Ensure you verify this based on your specific engine setup and intended use.
Do I need to perform any specific machining on the M5012 pistons before installation?
The M5012 pistons are CNC machined and should be ready for installation. However, you may need to check and adjust the piston-to-cylinder clearance and ensure the ring gaps are set correctly before installation.
What is the compression height of the M5012 pistons and how does it affect my build?
The M5012 pistons have a compression height of 1.27 inches. This measurement is critical for achieving the desired compression ratio in your engine build, so ensure it aligns with your cylinder head and gasket specifications.
What type of wrist pins are included with the M5012 piston kit?
The M5012 piston kit includes high-strength wrist pins designed to handle the performance demands of the Harley Twin Cam engine. Ensure proper lubrication and fitment during installation to maintain reliability.
