What material are these Manley exhaust valves made from?

These Manley Race Series exhaust valves are constructed from stainless steel. This material is chosen for its durability and ability to withstand high temperatures within the engine.

Are these valves suitable for all types of fuel?

These specific exhaust valves are recommended for use in alcohol engines. They are designed to handle the unique demands that alcohol fuels can place on exhaust components.

What is the benefit of swirl polishing and machining the valves?

Swirl polishing the under-head areas and fully machining the combustion faces helps to improve airflow into the cylinder. This can lead to more efficient combustion and potentially better engine performance.

Specifications

Brand: Manley Performance
Part #: 11101-1
UPC: 807298055787

Manley 90-99 Mazda Miata 1.8L (BP056) DOHC 16 Exhaust 28mm Stainless Race Master - Single Valve

Name: Manley 90-99 Mazda Miata 1.8L (BP056) DOHC 16 Exhaust 28mm Stainless Race Master - Single Valve
Brand: Manley Performance
SKU: manley-performance-manley-90-99-mazda-miata-1-8l-bp056-dohc-16-exhaust-28mm-stai-t14-364349
Price: 28.71 USD
Availability: BackOrder

$28.71

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Fits 1994-2005 Mazda Miata. Manley Race Series exhaust valve for improved durability and airflow.

Key Features

Fits 1994-1997 and 1999-2005 Mazda Miata.
Constructed from stainless steel for improved durability.
Features chrome stems and hard tips for enhanced wear resistance.
Swirl polished under-head areas and fully machined combustion faces help optimize airflow.
Race Master (straight stem) design is suitable for engines operating under 8000 RPM.
Recommended for exhaust valves in alcohol-fueled engines.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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About this part

Product Details

If you're rebuilding the top end of your 1994-2005 Mazda Miata's 1.8L DOHC engine, these Manley Race Master exhaust valves are a solid option. They're built from stainless steel, which is key for handling the heat and stress inside the combustion chamber, especially if you're running alcohol fuels. The chrome stems and hard tips add to their longevity, meaning they'll hold up better over time and resist wear in the valve guides.

Manley put some thought into optimizing airflow too. The under-head areas are swirl polished, and the combustion faces are fully machined. This helps the engine breathe a little easier and can contribute to more efficient combustion. These are the straight-stem Race Master style, designed for engines running up to 8000 RPM, making them a good choice for track use or spirited driving where durability is a priority.