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SuperTech Racing Engine Valve - Exhaust Valve .5mm Overbore - Honda Civic 01-05
We use our vast knowledge and experience of the D17, along with the application of computerized drafting to create these special valves. We performed intensive flow testing and worked very very closely with
many engine builders in order to provide the
market with the best possible product for your D17 engine.
High flow rates, durability and quality are of great concern & number 1 priority with us!
About Black
Nitride:
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.
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 brake when the valves bend due to impacts
with the pistons.
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