Harley Twin Cam, 103 cu in, 3.875 bore, 4.375 stroke, 7.667 rod, 11.25:1 CR, 85cc head
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Harley Twin Cam, 103 cu in, 3.875 bore, 4.375 stroke, 7.667 rod, 11.25:1 CR, 85cc head
|
Make |
Harley Davidson |
|
Engine Size |
103 CI |
|
Model |
Twin Cam |
|
Bore (in) |
3.875 |
|
Stroke (in) |
4.375 |
|
Comp Ratio |
11.25:1 |
|
Dome CC |
10.5 |
|
Comp Height |
1.085 |
|
Piston Part Number |
BHM5083 |
|
Conrod Part Nmber |
PSR6161 |
|
Pint Part Number |
927-2250-15CP1C |
|
Locks Part Number |
927x073 SWL |
|
Rings |
RS1660-3875-0THG |
|
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 | Harley Twin Cam, 103 cu in, 3.875 bore, 4.375 stroke, 7.667 rod, 11.25:1 CR, 85cc head |
|---|---|
| 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 is the recommended piston to cylinder clearance for the BHM5083 pistons?
For the BHM5083 pistons, a typical piston to cylinder clearance is around 0.0025" to 0.0030". However, it's crucial to verify this with your specific engine build and tolerances, as variations can occur.
What type of rings are included with the BHM5083 piston kit?
The BHM5083 piston kit includes RS1660-3875-0THG rings, which are designed to provide optimal sealing and performance. Ensure proper installation and ring gap settings as per the supplied instructions.
What is the compression height of the BHM5083 pistons?
The BHM5083 pistons have a compression height of 1.085 inches. This measurement is critical for achieving the desired compression ratio in your engine build.
What material are the BHM5083 pistons made from?
The BHM5083 pistons are forged from high-strength 2618 alloy, which provides excellent durability and performance under high-stress conditions typical of performance engines.
Do the BHM5083 pistons require any special machining?
While the BHM5083 pistons are CNC machined for precision, it's essential to check for proper bore clearance and ensure your cylinder walls are in good condition. Additional honing may be necessary depending on your engine's specifications.
