help!

[Yellowjacket]

Yellowjacket - What temperature is the combustion area? Have YOU tried this or similar products?

The temperature of the gases in the combustion chamber are close to 3,000 degrees F. Fortunately they are intermittent, so as long as the material there is conductive the temperature of the material in the combustion zone will not get that hot. Temperatures of the cylinder dome will be somewhere between the average temperature of the gas in the combustion chamber and the water on the other side that is in contact with the dome. The surface temperature on the cooling side is around 200 F. The metal surface temperature on the inside is a good bit hotter, generally above 400F. Durafix is only half as conductive as aluminum. That means that the temperature of the combustion chamber inner surface would be considerably higher than if the part were made of aluminum. This means that the chamber repaired with this stuff would run closer to detonation than the other cylinders. Since Durafix is a zinc/aluminum alloy the zinc part of the alloy will turn into taffy at about 200C (392 F). While it melts at 732, it really can't be used above 400. You could try it, and if you weren't running the engine hard it might work, for a while, but this is a racing engine and in hard use it isn't going to stay in there for long. If it was that easy and worked people would be doing it all over the place and nobody is.