English to Polish Tech/Engineering Automotive / Cars & Trucks

Every time the cylinder heads are freshened up (reconditioned), the seats are recut and the valves sink deeper into the port areas. By the same token, every time the deck surfaces are “kissed,” the valves move closer to the combustion chambers. Recutting the seats results in sharpening the short-side radius of the port, slightly hindering flow. Moving to large-diameter valves, and/or replacing seats with new seats tends to improve flow because you’re moving the valve closer to the combustion chamber and allowing a softer radius. A variety of seat materials are available, including beryllium copper, ductile iron, stellite, chromium, nickel alloy, cobalt, and powdered metal.


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