![]() ![]() It’s quite easy to overdo and something that’s seen more frequently than expected across all levels of racing. Secondly, is the deburring of the rings after gapping. An angle in the opposite direction will “feel” right on the gauge, but you’ll have more gap exposed at the cylinder wall where it is most crucial (increased potential for blow-by). First, are the rings still square after filing? One direction gives you a false reading of the size of the gap if you don’t notice the feeler gauge isn’t flush with the cylinder wall (increased potential for butting). There are a couple of basics that we continue to see on parts returned for analysis. ![]() Make sure you keep the gap straight and not V-shaped when filing.Īccording to Eric Grilliot of MAHLE Motorsport, “File-to-fit rings are great, but there are a lot of ways to screw them up if the wrong technique is used. Manufacturers will often give specific details about the second compression ring gaps in the instructions. The biggest change has been attention to the second compression ring gap. More recently, compression ring material was upgraded from ductile iron to steel. SteelĪt one time, the standard material for piston rings was ductile iron. This will provide maximum performance and help reduce emissions. During engine operation, the smallest gap would provide the best seal for combustion and have the least amount of blow-by. The optimum gap for the top piston ring should be as tight as possible without the two ends ever touching. This measurement comes from testing and resources that have been found to optimize engine performance based on the application. Manufacturers of piston rings will often specify ring gaps that are based on the performance use of the engine. To get some solid information about piston ring gaps, we reached out to MAHLE Motorsport because, well, they know piston rings. Extensive testing, along with changes in piston ring material, has brought about changes in these necessary gaps. But do we ever stop and consider that this clearance plays an extreme role in how the engine will perform? Though engine builders understand the importance of piston ring gaps, there have been changes to the ring gap procedures that need to be addressed. The piston rings are then checked for proper gap clearance and then the engine is assembled. Many times, a set of piston rings come with the pistons we are going to use. Piston ring gaps are a small aspect of the internal combustion engine that is often overlooked. ![]()
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