We ( Thumper Performance) just did what was needed for the 81 mm Big Bore Tritec engine. We decided to go to the Thin wall, super strong High Strength Ductile Iron Sleeves (While there is no large difference when it comes to tensile strength, ductile iron has the greater yield strength (40 ksi). Cast steel, on the other hand, can only reach 36 ksi yield strength. As the strength of ductile iron increases ductility decreases. Ductile iron has superior shock absorption to steel. ) .
High Boost was one of the criteria ( whether used or not) We kept the stock steel Crank stroke and added in the H-beam K1 Connecting rods.
JE made the custom Pistons, Pins and locks. They also provided the ring set for the 81 mm Forged Pistons.
King Bearings with their Silicon-aluminum Performance Rod and Main Bearings.
The engine was then blueprinted ( end gaps/piston clearance/bearing clearance/ Decked and trued the deck). We didn't do anything Trick, just good Performance Engine Building.
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