I tried these in a engine I built for racing. Leakdown was excellent,less than 2%.. But, at the time I had no dyno,hence no way to know (other than leakdown) if they were truly beneficial. Was it money wasted or well spent. I normally use a traditional steel alloy/moly top ring , a ferrox coated iron second.Have had very good luck with these also,but always looking for an edge..I am thinking about going with a Total Seal gapless design again,on a mountain motor /nitrous engine. Any experiences out there with these rings?? Street car,race,motorcycle??? Any replies much appreciated........ Craig
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