what if you were to coat the other side of the pre-cup to keep heat in the precup only??? would that work???
Do you think you could prevent the cracks between the valves on the head if you ceramic coated in that area?
Quotewhat if you were to coat the other side of the pre-cup to keep heat in the precup only??? would that work???See that is actually the common misconception, if you CC a precup the iconel no longer absorbs as much heat as it originally did, so it is much colder, heat is not trapped but reflected.I just had a PM about why I wouldn't bother CCing the intake valve faces but would on the exhaust side, simply the exhaust valve is getting head soaked from the port and manifold pressure, the stem on the intake side has pressure of cool air, the exhaust side has a pressure of cooking hot air, the exhaust valves maintain a much higher overall heat, even though both faces are exposed to same amount of heat during the combustion process. This is why exhaust valves burn out faster than intake valves.
Ah... so what you're saying is that the pre-cup doesn't hold any heat? its the heat around it that radiates inside???
Quote from: "jtanguay"Ah... so what you're saying is that the pre-cup doesn't hold any heat? its the heat around it that radiates inside???Yep, that's why diesels are more efficient the hotter they run (until you warp the head or crack something :oops: ).
Isn't it the compressed air that carries the heat?
Quote from: "Mark(The Miser)UK"Isn't it the compressed air that carries the heat? Most of it, yes, but it's easier to reach the 1500*F ignition temperature when the chamber walls are 212*F vs. 72*F.