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The SC7541-4 is a CP Pistons forged piston and ring set built for the Mazda BP-Z3 (BP-VE) 1.8L engine found in the 2001-2005 Mazda Miata NB2. Machined from 2618 forged aluminum and bored to 83.5mm (+0.5mm over standard), this set is designed to restore or upgrade cylinder sealing after a light rebore while holding a 9.0:1 compression ratio. Each SC7541-4 kit ships as a complete set of four pistons with rings, wrist pins, and pin locks so an engine builder does not need to source those components separately.
Key Features
- Forged 2618 aluminum piston construction for strength under high cylinder pressure
- 83.5mm bore (+0.5mm oversize) sized for a light rebore of the BP-Z3 block
- 9.0:1 compression ratio to match factory-style power delivery
- Dual forced pin oilers for improved wrist pin lubrication
- Accumulator groove to reduce top ring flutter and improve ring seal
- Pistons balanced to within one gram, CNC machined in the USA
- Wrist pins and pin locks included at no additional cost
Fitment
| Years | Make | Model | Application |
|---|---|---|---|
| 2001-2005 | Mazda | Miata |
Specifications
| Manufacturer | CP Pistons |
|---|---|
| Manufacturer Part Number | SC7541-4 |
| Product Type | Piston Sets - Forged - 4cyl |
| Fitment Type | Vehicle specific, exact engine build verification required |
| Bore | 83.5mm (+0.5mm oversize) |
| Stroke | 85mm |
| Compression Ratio | 9.0:1 |
| Compression Height | 1.208in (30.7mm) |
| Rod Length | 133mm (5.233in) |
| Pin Size | 20mm (0.787in) |
| Ring Pack | 1.0mm / 1.2mm / 2.8mm |
| Piston Material | 2618 forged aluminum |
| Set Quantity | 4 pistons |
What's Included
- 4x SC7541-4 forged pistons
- Matching piston ring set
- Wrist pins
- Pin locks
About CP Pistons
CP Pistons develops forged pistons, piston rings, wrist pins, and related engine components for performance applications. Correct selection and assembly depend on the exact engine, dimensions, cylinder head, connecting rod, intended use, machine work, clearances, and manufacturer part number.
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Frequently Asked Questions
How do I confirm this CP piston set matches my engine build?
Confirm the exact engine family, bore size, stroke, connecting rod length and small-end diameter, cylinder head and valve layout, compression height, dome or dish volume, ring pack, wrist pin, and manufacturer part number.
Can the advertised compression ratio be used for every build?
No. Final compression depends on bore, stroke, deck height, gasket thickness and bore, combustion chamber volume, piston-to-deck position, and the exact piston crown volume.
What measurements are required before final piston assembly?
A qualified engine builder should verify bore finish and clearance, ring end gap, pin fit, deck clearance, piston-to-valve clearance, rod and counterweight clearance, and all CP installation specifications.
Installation Instructions
Professional engine machining and assembly are required. Follow the current CP Pistons and engine-builder instructions for this exact part number. Measure every bore and component, verify all clearances and ring gaps, clean all parts and oil passages, use the specified lubricants and fastener procedures, confirm rotating-assembly and piston-to-valve clearance, and complete the required break-in and calibration.
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