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Coated valves

Twisted Steel Performance

Anything worth doing is worth overdoing.
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Coating Valves is a way to increase Horse Power, reduce part temperature, shed carbon for better air flow and even provide lubrication between the seat and valve.

Valves can be coated with two different systems. They are, Dry Film Lubricants and Thermal Barriers. These systems can be beneficial on all pistons whether 4 stroke, 2 stroke, gas, alcohol, diesel, reciprocal or rotary.

We will look at the Thermal Barrier coatings first. Either CBC2 or CBX may be applied. CBX is recommended for all High Compression (13:1 and higher), Turbo Charged, Super Charged, or engines running Nitrous Oxide. CBC2 should be run on all other engines. Both CBC2 and CBX insulate the Valve against damaging heat transfer, keeping more of the heat generated by combustion, pushing down on the piston for greater power. By retaining minimal heat on the surface of the Valve less heat is transferred to the incoming fuel mixture, leading to a reduction in pre-ignition which leads to detonation. The coatings can also allow heat at the surface to move more evenly over the surface reducing hot spots and the coatings reflect heat into the chamber for more even distribution of heat, allowing more efficient combustion of the fuel. This allows more of the fuel molecules to be oxidized, which in turn, means less fuel is needed for optimum power. The result is an engine that makes more power, can be run with a leaner air fuel mix and less initial timing and has less thermal expansion due to a reduction in the heat absorbed.

By applying a dry film lubricant friction, galling and wear is reduced. In addition the lubricants are “fluid retaining” materials that actually hold oil to the surface beyond the pressure where the oil would normally be squeezed off which can be critical on Exhaust Valve Stems. This leads to better lubrication with no increase in friction, reducing the potential for a Valve sticking/jamming in the guide. If the valves have already been machined for assembly it is good to coat the machined surface that rides on the valve seat for increased Lubrication between the Valve and Seat.

In a test on a twin turbo charged engine using propane for fuel, in a Power Plant application, the wear was decreased dramatically. Without the coatings the intake valve would show wear within 3 months and the exhaust valve would have worn so much that it required replacement, After applying Tech Line Coatings the engine was torn down for inspection after 3 months and the intake showed no wear and the exhaust very minimal wear. The valves was primarily coated with C-Lube ( Valve seat area, Back and Stem), though the combustion chamber surface was coated as well.

The following coatings are recommended for Valves: DFL-1, TLML, CermaLube (Highly recommended), CBC2, CBX.
 
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