Supertech MAEVN-1206-8 – +1 mm Oversize Black-Nitrided Exhaust Valve Set (Mazda BP 1.8 L)

Supertech’s MAEVN-1206-8 kit supplies eight +1 mm oversize exhaust valves for the 1.8 L Mazda BP engine found in the MX-5/Miata (1994-2005) and Ford Escort GT. Each valve is forged from 23-8 N stainless steel and finished with a Black Nitride coating, improving heat resistance, reducing stem-to-guide friction, and boosting exhaust-flow capacity.

Key Features

  • +1 mm head diameter (29 mm) – larger curtain area increases exhaust flow, supporting higher power at elevated RPM.

  • Black Nitride surface (~52 HRC) reduces wear and lowers friction for better guide life and valve stability.

  • One-piece forged stainless construction delivers superior fatigue strength and crack resistance under extreme temperatures.

  • Single-groove keeper is compatible with most Supertech and OEM spring/retainer sets.

  • Direct fit after minor seat enlargement—ideal for ported heads or builds targeting higher exhaust throughput.

Technical Specifications

Parameter Value
Valve type Exhaust
Head diameter 29.00 mm (+1 mm)
Stem diameter 5.94 mm
Overall length 102.0 mm (STD)
Material 23-8 N stainless steel
Surface treatment Black Nitride
Keeper style Single groove
Pieces per kit 8

Vehicle Compatibility

Brand Model Generation / Chassis Engine
Ford Escort GT 1994-2005 BP 1.8 L
Ford Miata 1994-2005 BP 1.8 L
Ford MX-5 1994-2005 BP 1.8 L
Mazda Escort GT 1994-2005 BP 1.8 L
Mazda Miata 1994-2005 BP 1.8 L
Mazda MX-5 1994-2005 BP 1.8 L
SUPERTECH

SUPERTECH

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Supertech Mazda Miata 1.8L Black Nitrided Exhaust Valve - +1mm Oversize - Set of 8

Brand: SUPERTECH Product id: 72300 MPN: ST-MAEVN-1206-8
EAN: 5903713182870
Availability: Available to order
208.63€
206.54€ Excl. VAT: 170.70€
EU Shipping — No Import Taxes
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Tags: Engine\By Car Make\Mazda\1.8 I4 (VC),

Brand Model Generation Engine
Ford Escort GT 1994-2005 BP 1.8 L
Ford Miata 1994-2005 BP 1.8 L
Ford MX-5 1994-2005 BP 1.8 L
Mazda Escort GT 1994-2005 BP 1.8 L
Mazda Miata 1994-2005 BP 1.8 L
Mazda MX-5 1994-2005 BP 1.8 L

SUPERTECH

Product Title: SUPERTECH High-Performance Engine Oil – Ultimate Protection for Car Enthusiasts Introducing SUPERTECH High-Performance Engine Oil, the premium choice for car enthusiasts seeking unparalleled engine protection and performance. Designed to meet the demands of high-performance vehicles, SUPERTECH ensures your engine runs smoothly and efficiently, enhancing both longevity and power. Key Features and Benefits: - Advanced Synthetic Formula: Provides superior lubrication and reduces engine wear, ensuring optimal performance under extreme conditions. - High Viscosity Stability: Maintains consistent viscosity across a wide temperature range, delivering reliable protection in both hot and cold climates. - Enhanced Fuel Efficiency: Formulated to minimize friction, helping you achieve better fuel economy without sacrificing power. - Superior Cleaning Agents: Keeps your engine clean by preventing sludge and deposits, promoting a longer engine life. - Compatibility with All Engine Types: Suitable for both gasoline and diesel engines, making it the versatile choice for all car enthusiasts. With SUPERTECH High-Performance Engine Oil, you can trust that your vehicle is receiving the best care possible. Don’t compromise on quality—experience the difference that premium engine oil can make. Upgrade your engine's performance today and feel the power of SUPERTECH. Order now and give your car the protection it deserves!