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Dean..... ...the original thinking behind the 4-ring pistons, was that the lower 2nd oilring would reduce oil consumption. Yep, it did it so well that the other rings starved for oil and the cylinder wall wore faster'n he!!. You do know that its the engine oil behind the rings that provides the final seal, don't you? Modern 3-ring piston design with improved metalurgy and ring design give longer wear and reduced friction for improved economy of operation. And NO, I don't know of any "domed" N-Tractor pistons available, but you can always have specialized "hot-rod" pop-up pistons made to your specifications $$$ You need to specify bore, stroke, deck height, piston pin diameter and then don't get carried away on high compression 'cuz there ain't much room above the piston before it knocks the cylinderhead. As for why you think you have less power with 3-rings after your overhaul, I have NO IDEA but with 6.5:1 CR and 26hp PTO (90 psi compression min dry) I wouldn't expect much noticeable power increase. Iff'n you still have power issues, find a tractor dealer that has a PTO horsepower brake and have the PTO hp measured right on the tractor$$$$. Big diesel tractor repair outfits do it all the time to adjust the diesel fuel pump..... ....Dell
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