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Supertech Black Nitrided Valve Set EJ25 EJ20

In stock in overseas warehouse (dispatch within 3-7 days)

Regular Price: £439.00

£417.05

Quick Overview

Suitable for Subaru EJ25 / EJ20 DOHC Turbo engines

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Regular Price: £439.00

£417.05


Details

Supertech Black Nitride Valve Set - 16pc (Intake + Exhaust), standard size
 
Suitable for Subaru EJ20 / EJ25 DOHC Turbo engines
 
Exhaust:
Head Diam: 32.00mm (std) - oversize also available
Stem Diam: 5.96mm
Length: 104.7mm (std)
Material: Black Nitrided
 
Intake:
Head Diam: 36.00mm (std) - oversize also available
Stem Diam: 5.96mm
Length: 104.35mm (std)
Material: Black Nitrided
 
Supertech Performance uses their experience of more than 20 years in the manufacturing of racing valves, do intensive testing and work very closely with many engine builders in order to continuously improve and provide the market with the best possible product for every application. High flow rates, durability and quality are of great concern to Supertech Performance.
 
Black Nitride Coating
This is a hardening treatment that even though it is not widely used as the chrome coating, it has several benefits and is becoming very popular, mainly for European and Japanese applications. The microhardness is higher than the stainless steel base material, keeping good ductility beneath the hard nitrided layer (microhardness is 800HV minimum). Surface Finish is smoother than with chromed stems, having less friction between stem and guide. Value seat surface is harder with the nitrided layer, lasting longer with lead free fuels, alcohols, nitro or other "explosive" mixes. Matches any kind of seats (nodular iron seats, steel powder metal seats, hard aluminum-copper seats or beryllium copper seats).
 
Higher RPM engines take full advantage of all previous features. The higher the engine speed the bigger the power loss due to internal engine friction! The black nitride layer reduces this power loss due to less valve-guide friction.
 
The nitrided layer is adhered to the base material at a microscopic level, so does not "flake" or brake when the valves bend due to impacts with the pistons. The Black Nitride applies to the whole valve while the chrome coating is only applied to the stem. All valves are swirl polished, have stem undercut and a hardened tip.

Additional Information

SKU SEVN-1010/SIVN-1010
Stock Traffic light status amber
Brand No
Color No

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