Valve – Intake or Exhaust with Black Nitrate Coating
This is our top of the line Valve. It has been coated with Black Nitrite and polished for the ultimate finish:
- Black nitrate coated – Stainless Steel
- Swirl polished heads & stems
- Stelite tipped
- Intake or Exhaust
What is Black Nitrate?
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.
The micro-hardness is higher than the stainless steel base material, keeping good ductility beneath the hard nitrided layer (micro-hardness is 800HV minimum).
Surface finish is smoother than with chromed stems, having less friction between stem and guide.
Valve 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’s 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 break 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.
Manufactured exclusively by Starklite Cycle
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