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High-Flow Oiling for the Correct Long-Nose-Crank Miata Engine
Boundary BP-S2-M combines the Stage 2 high-flow pump design with MartenWear-treated billet gears for the mid-1991–2005 Mazda Miata 1.6L/1.8L with a long-nose crank. The crank configuration matters: early small-nose-crank engines require a different pump.
Key Features
- BP-S2-M uses the Stage 2 deeper-pocket design and larger gears.
- MartenWear treatment hardens the billet gear wear surfaces.
- Manufacturer lists compatibility with the supported VVT application.
- Assembled, inspected and supplied with a pump specification sheet.
Fitment
| Years | Make | Model | Engine / Requirements |
|---|---|---|---|
| 1991 (late production only)–2005 | Mazda | Miata | 1.6L / 1.8L; Long-nose crank only. Mid-year 1991 change; confirm the actual crank before ordering. Excludes small/short-nose crank. |
Match BP-S2-M to the actual engine and pump configuration, especially on engine-swapped or modified vehicles.
Specifications
| Detail | Value |
|---|---|
| Manufacturer | Boundary Racing Pumps |
| MPN | BP-S2-M |
| Assembly | Stage 2 high-flow oil pump |
| Gear construction | Billet steel |
| Treatment | MartenWear |
| Back plate | Standard configuration |
| Warranty | Manufacturer lifetime warranty; terms apply |
What's Included
- One BP-S2-M assembled oil pump.
- OEM crank seal must be supplied separately.
- Only the specified assembly; related parts and service consumables are separate.
About Boundary
Boundary Racing Pumps develops billet oil-pump gears and assembled pumps in the USA. Its range includes engine-specific pump revisions, high-flow designs and optional MartenWear surface treatment.
Related Parts
- Boundary BP-SH-K pump shim kit — optional pressure-adjustment hardware. Match the pump and required pressure with your engine builder; it is not included.
FAQ
What is the BP-S2-M?A Stage 2 high-flow assembled oil pump with MartenWear-treated gears for the listed long-nose-crank Miata engines.
Will it fit every 1991 Miata?No. The manufacturer starts this pump's application at mid-1991. Verify the actual crank configuration.
Does it fit an early small-nose crank?No. Boundary lists a separate small-nose-crank pump.
Is the crank seal supplied?Boundary requires the customer to supply an OEM crank seal before installation.
What does Stage 2 change?The pump uses a deeper pocket and larger gears to increase flow.
What does MartenWear treat?It hardens the exterior wear surfaces of the billet gear components.
What oil pressure will my engine make?That depends on the supplied pump/shim configuration, oil, temperature and engine clearances. Confirm the specification sheet rather than assuming a fixed pressure.
Is this the same as buying only gears?No. This listing is for an assembled pump; the separate gear photo illustrates the treatment.
Installation Instructions
- Read the pump specification sheet and current manufacturer instructions; verify the actual engine, crank and pump revision.
- Have a qualified technician follow the vehicle service procedure for access, engine timing and sealing.
- Install BP-S2-M using the specified clearances, priming method and fastener torques; no universal torque value applies.
- Verify oil pressure, sealing and correct operation before loading the engine.
Image note: Manufacturer and supplier product-family views illustrate the assembly and gear design. Treatment and back-plate contents follow the exact part number above; representative open views do not show every supplied component.
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