Supertech SPRK-MM18D Dual Valve Springs Kit Miata BP 177 lbs Image1
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Supertech Dual Valve Springs Kit Miata BP 177 lbs

  • Chrome Silicon Vanadium

  • Computer designed

  • High durability

Supertech SPRK-MM18D Dual Valve Springs Kit Miata BP 177 lbs
List Price: $586.30
$469.04  Save 20%
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6 in alternate warehouse
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Product Details

​Supertech valve springs are computer designed to ensure smooth harmonics under high RPM and load. The stress levels are kept under control and fatigue is reduced for long durability under extreme conditions. These springs are made of premium Superclean Chrome Silicon Vanadium steel alloy, which is a tough alloy that was designed for higher performance and durability at high RPM's and memory retention.


  • Outer Spring O.D.: 27.50mm
  • Outer Spring I.D.: 20.00mm
  • Inner Spring O.D.: 20.00mm
  • Inner Spring I.D.: 15.20mm
  • Seat: 74 @ 34.20 ([email protected])
  • Open (lift): 177 @ 10.5 ([email protected])
  • Max net lift: 13.00mm
  • Coil bind: 20.70mm
  • Rate: 12.10 lbs/mm

Retainer P/N: RET-TS60/MA2 + (16) SEAT-TS/MA18I+OEM (use '97 + Cotters)

Note: This is for a complete set of dual intake and exhaust valve springs, & retainers and spring seats.


** Images shown may vary from actual product **

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Vehicle Applications

Years Make Model Trim Chassis Engine Notes
1999 - 2000 Mazda MX-5 Miata   (NB) BP-4W  
1994 - 1997 Mazda MX-5 Miata   (NA) BP