Harley Twin Cam, 107 cu in, 3.937 bore, 4.375 stroke, 7.667 rod, 10.75:1 CR, 85cc head
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Harley Twin Cam, 107 cu in, 3.937 bore, 4.375 stroke, 7.667 rod, 10.75:1 CR, 85cc head
|
Make |
Harley Davidson |
|
Engine Size |
107 CI |
|
Model |
Twin Cam |
|
Bore (in) |
3.937 |
|
Stroke (in) |
4.375 |
|
Comp Ratio |
|
|
Dome CC |
18.34 |
|
Comp Height |
1.085 |
|
Piston Part Number |
BHM107-18 |
|
Conrod Part Nmber |
PSR6161 |
|
Pint Part Number |
927-2250-15CP1C |
|
Locks Part Number |
927x073 SWL |
|
Rings |
RS1MG660-3937-THG |
|
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, 107 cu in, 3.937 bore, 4.375 stroke, 7.667 rod, 10.75:1 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 bore clearance for the BHM107-18 pistons?
The recommended bore clearance for the BHM107-18 pistons should be set according to the specific application and engine builder's preferences. Typically, a clearance of 0.0025" to 0.0035" is a good starting point, but always consult the manufacturer's guidelines and your engine's specific requirements.
What type of ring end gap should I use with the BHM107-18 pistons?
For the BHM107-18 pistons, the ring end gap should be set according to the intended use of the engine. A common guideline is 0.004" to 0.005" per inch of bore diameter for naturally aspirated applications, and slightly larger for boosted applications. Always refer to the supplied instructions for specific recommendations.
What is the compression ratio of the BHM107-18 pistons in a stock Harley Twin Cam engine?
The BHM107-18 pistons are designed to achieve a compression ratio of 10.75:1 when used with an 85cc head. However, actual compression ratio may vary based on the specific cylinder head and gasket used, so it's important to calculate the final ratio based on your engine's configuration.
What material are the BHM107-18 pistons made from?
The BHM107-18 pistons are forged from high strength 2618 alloy, which provides excellent durability and performance characteristics suitable for high-performance applications.
Do I need to perform any specific machining on the BHM107-18 pistons before installation?
Before installation, ensure that the pistons are fitted with the correct bore clearance and that the ring gaps are set as per the supplied instructions. No additional machining is typically required, but always verify with your engine builder for any specific requirements related to your setup.
