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Boundary Stage 2 Miata BP High Flow Oil Pump

Miata Oil Pump

Boundary Stage II Miata pumps increase the overall flow by machining a deeper pocket into an OEM Mazda 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.
  • Stage 2 pumps include everything the Stage 1 pump has, plus larger gears that are fitted into the oil pump which increases mid-range protection and insures compatibility with the increased demand of the VVT oiling system
  • The pump is shimmed, increasing maximum warm pressure from 60 PSI to 70 PSI
  • Also fits Ford's equipped with BP engine
  • Shipping: In-Stock Items ship USPS unless noted otherwise
    Pricing: $399.00
    Free U.S. Over $150


    The sintered gears inside of a stock oil pump assembly only rates to about 6KSI of stress before shattering. These gears provide a serious structural upgrade to 90Ksi steel. The gears match the specification of a 91.5-00 oil pump housing.
  • Shatterproof stock replacement gear sets
  • Machined from hardened 4140 Chromoly Billets
  • Each unit inspected electronically and by hand
  • Machine de-burred and touch up de-bur by hand
  • Individually numbered and logged into our database

    Technical Insight:
    The standard 91.5-00 OEM oil pump comes in a thickness of .373. The VVT high-volume OEM pump comes in a .393 thickness. Boundary Stage 1 pumps are .373 with billet gears to increase flow, and the Stage 2 pumps are machined to .430. Along with the many other improvements they make to the gerotor pattern, the Stage 2 pump provides an easy 10% flow over the OEM VVT spec high-flow pump, or 15% more over the 91.5-00 NON-VVT OEM pump. That extra flow gives you more idle to mid-range oil pressure as well as reaching maximum relief valve pressure faster. The relief valve shimming only affects your max oil pressure (5000 RPM plus). These pumps have tested privately up to 100PSI with no ill effects, but testing has shown 76 PSI being most beneficial to bearing and tappet wear without cold start pressures being very high. More oil pressure equals longer engine life!

  • Details

    Shipping Information

    • Item Requires Shipping
    • 8.0 lbs.
    • W8.0000” x H6.0000” x L14.0000”
    • Free U.S. Over $150
    • In-Stock Items ship USPS unless noted otherwise

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