Boundary Oil Pump - 91.5 - 05 Miata

The Boundary BP oil pump starts with a fully torn down and inspected housing. This housing is then assembled with our billet oil pump gear and sealed. This pump also and comes with the option for a high flow billet backplate for those running over 7000 RPM consistently.

All assembled billet pumps undergo the following:

• Pump is completely taken apart, all parts under go ultrasonic cleaning, air blast, and hand inspection.
• Pump is hand de-burred.
• Our industry leading mirror finished gear set is used
• Stainless Torx heads replace the stock fasteners
• All fasteners are torqued to spec
• Loctite applied to fasteners to prevent back out or loosening
• Anaerobic sealant applied to critical areas to boost pump up speed and reduce aeration.
• Assembly lubricant applied to all critical surfaces to get oil flowing fast on startup
• Parts are blue printed and issued with specification sheet.

Stage II pumps increase the overall flow by machining a deeper pocket into the oil pump and fitting larger gears in this pocket. This increases the strength of the pump, increases mid-range oil pressure, and increases the strength of the oil pump gears.

The Stage II Pumps have these additional modifications:

• Larger gears are fitted into the oil pump which increases mid range protection and insures compatibility with VVT.
• The pump is shimmed increasing maximum warm pressure from 60 PSI to 70 PSI.

Fitment:

• BP-S1 (Stage 1) - 1991.5 - 2000 Miata (Long Nose Crank) - Not Recommended For VVT Engines
• BP-S2 (Stage 2) - 1991.5 - 2005 Miata