What material are these Manley exhaust valves made from?

These Manley Race Master exhaust valves are constructed from stainless steel. This material is chosen for its durability and ability to withstand high temperatures and pressures found in the engine's combustion chamber.

Are these valves suitable for all types of engines?

While these valves are designed for performance applications, they are specifically recommended for alcohol engines due to their robust construction. They are also suitable for bracket, drag, and oval track racing engines operating under 8000 RPM.

What is the benefit of the swirl-polished and machined surfaces?

The swirl-polished under-head areas and fully machined combustion faces are designed to improve airflow efficiency. This can help optimize the combustion process and potentially lead to better engine performance.

Specifications

Brand: Manley Performance
Part #: 11103-8
UPC: 807298055831

Manley 90-99 Mazda Miata 1.8L (BP056) DOHC 16 Exhaust 29mm Stainless Race Master Valves

Name: Manley 90-99 Mazda Miata 1.8L (BP056) DOHC 16 Exhaust 29mm Stainless Race Master Valves
Brand: Manley Performance
SKU: manley-performance-manley-90-99-mazda-miata-1-8l-bp056-dohc-16-exhaust-29mm-stai-t14-5530
Price: 229.72 USD
Availability: BackOrder

$229.72

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Fits 1994-2005 Mazda Miata. Manley Race Master exhaust valves improve airflow with a swirl-polished design and durable stainless steel construction.

Key Features

Fits 1994-1997 and 1999-2005 Mazda Miata 1.8L DOHC engines.
Constructed from durable stainless steel for long-lasting performance.
Features chrome stems and hard tips to enhance wear resistance.
Swirl-polished under-head areas and fully machined combustion faces optimize airflow.
Race Master (Straight Stem) shape is suitable for many racing applications.
Recommended for exhaust valves in alcohol 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 a strong material that holds up well under the heat and pressure of combustion. The 29mm diameter is designed to fit the BP056 engine, helping to optimize airflow into the cylinder.

Manley puts a lot of care into these valves. The stems are chromed and have hard tips, which adds to their longevity and resistance to wear, especially in engines that see a lot of use. The under-head area is swirl-polished, and the combustion face is fully machined. This attention to detail helps smooth out the path for air and fuel mixture, potentially leading to improved combustion efficiency. These are also recommended for alcohol-fueled engines, which run hotter and require robust exhaust valve components.