Project Do It All S13, Assembling the Bulletproof SR20DET Bottom End!

For bearings we used tri-metal ACL racing bearings, these use a hard underly for load capacity with a thin softer top layer for embeddability and more forgivingness to contaminates.  The top layer is zinc plating that reduces scuffing on break-in and start-ups. Tri-metal bearings can take more load and are suitable for high-performance use on engines with frequent oil change intervals.  We WPC treated the bearings as data has shown the WPC treatment can increase load bearing capacity by 20!

For rods, we selected Wisco’s boostline parts.  Boostline rods are FEA designed to withstand the extreme compressive loads that forced induction engines can produce and we figured that they would be perfect for our engine.

The wide beam base with the 3 pockets is the result of a computer-aided FEA study that simulated the stresses the rod will see with boost pressure.  This shape was thus determined to provide the most compressive strength for the least amount of weight.  The rods are forged from super strong 4340 alloy.

Here is the FEA output showing the bending resistance of the boostline design vs a conventional I-beam rod.

We got our rods with the optional ARP Custom Age 625 rod bolts, these bolts are almost 20% stronger than the very strong standard ARP 2000 bolts.


  1. What are the boundary conditions for the FEA images? Something looks a little strange in how forces are applied to the little and big end… Are they not treating it as a pinned connection with bearing loads for the application of the loads?

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