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 Mercury Bridgeport Reliability Jay, I just read an article about the Mercury 2.4 Bridgeport being a reliable engine. I have a question about the machining of the pistons I read about in some of your posts. What needs to be done to the piston to have the bridge cool correctly? I have two 2.4 Bridgeport engines that I am currently in the process of rebuilding. I have just found out that I can use 2.4 litre Wiseco pistons if I modify them to allow better cooling of the bridge. Is this the machining you were referring to? Also, what is the benefit of dry stacking a relatively stock engine? Does this add or take away from the reliability? I have 20-inch midsections with offshore exhaust and the stock tuner. What is the turnaround time for the dry stacking modification?.
Thanks, Gary, this is how we modify a Mercury Bridgeport piston: First, we mark the piston at the point where the bridge is located in the bore. Then, below the bottom ring land we use a 1/4" end mill and slowly, plunge the end mill in about .010" and continue at this depth to the edge of the piston skirt. After we have a flat groove milled into the piston, I use a 1/16" drill bit to drill three holes in this flat, equal spacing from bottom of the skirt to about 1/2" from the ring land. This allows a cool fuel charge to be introduced into this part of the piston, and has a cooling effect on the port bridge, prolonging its service life. Dry stacking can increase acceleration and idle quality without any consequence to reliability, as long as this modification is performed properly. Turnaround for this service is normally a one day in our shop. Jay @ JSRE
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