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Here's a comparison of the pistons designed to go on the rods we showed you above. This time, the older component is on the left while the modern piston from Mahle is on the right. Besides the obvious difference in weight (remember, both are designed to withstand approximately 500 horsepower), the new piston also has the advantage of smaller skirts to reduce friction, a smaller wristpin to reduce weight, more accurately cut valve pockets and ring lands, a coating on the skirts to reduce the chances of scuffing, and gas ports in the ring lands to provide excellent ring seal, even with low-tension rings. The notch in the top of the older piston is for spark-plug clearance, which Dorton said killed the efficiency of the flame travel. View Related Article
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