3-ring versus 4-ring pistons~308
Comments
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I got the same advice from a friend who used to be at Hastings and was a ring designer. I've been running my Hornet with 3 modern rings and the lower groove empty for about 25,000 miles now. Nary a problem of oil consumption, smoking, etc. One interesting note: Hastings and maybe others make a type of ring referred to as "barrel-faced." The outer surface of the ring is slightly convex, which has two advantages: takes less pressure to maintain a good seal, thus less cylinder wear; and if there IS cylinder wear, the convex face fits and seals better in the worn part of the bore. Win-win.0
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Thanks Park W. I went on the Hastings website and they do not list the 308 6 (at least anymore) in their applications. However, the size I need (diameter) for a 308 + .030 (3.84) is listed and several types of rings are listed as well, including the barrel face. Is this what you used?0
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Yes, I just ordered them based on the groove dimensions and bore size, and the two compression rings were the barrel-face type.0
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I machined my own pistons and used three slotted racing rings. I recommend it.... Also, I expect that you guessed I did not use "pined" pistons or rings...0
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