Boundary Stage 1 Oil Pump for Mazda MX-5 NA NB

The Boundary Stage 1 oil pump is a must-have upgrade for MX-5s looking to run either a higher rev limiter or higher power. A good rule of thumb is anything over 300 horsepower or running over 7,000 RPM be installing billet oil pump gears. Shock loading caused by boost cut or RPM limit can shatter the OEM sintered oil pump gears, resulting in complete engine failure.

Consider it insurance if you’ve just built a forged engine with new pistons, rods, and bearings?you wouldn’t want all that to be ruined by an oil pump failure. The sintered gears inside of a stock oil pump assembly are only rated to about 6KSI of stress before shattering. These gears provide a serious structural upgrade to 90Ksi steel.

All Boundary billet oil pumps start with a brand new pump which undergoes the following processes

• The pump is completely taken apart, and all parts undergo ultrasonic cleaning, air blast, and hand inspection
• The pump is hand de-burred
• An industry-leading mirror-finished stage 1 gear set is used
• Stainless Torx heads replace the stock fasteners
• All fasteners are torqued to spec
• Loctite is applied to fasteners to prevent back-out or loosening
• Anaerobic sealant is applied to critical areas to boost pump-up speed and reduce aeration.
• Assembly lubricant is applied to all critical surfaces to get oil flowing fast on startup
• Parts are blueprinted and issued with a specification sheet

This is an assembled oil pump with billet gears to suit the 1990-2005 engines, except for the 2001-2005 1.8 VVT engine which requires the stage 2 pump or greater. A front main seal is not included.