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1800HP 3.5L Dart 2JZ Engine Teardown, And What We Learned.

It's been a real treat being able to test this new era of 2JZ blocks by Dart, especially with such a wild combination like the 96mm stroker setup we used. While the engine was running well, we wanted to take the chance to tear into it and see how the individual parts were holding up. This brought us some valuable insight as to how these parts work with one another, and where theres room to improve. 

One of the things we had been testing with the new block from Dart, is finding the limit for an OEM style, MLS headgasket. We completed 30 + dyno hits at over 1700hp with no abnormalities in coolant pressure. Later above 1800hp, we started to see a slight pick up in coolant pressure. We did not have a full "Headgasket failure" but as you can see above, we did find some sections showing combustion bleed, presumably from the head beginning to lift. You normally see this on a 2JZ with an MLS at a lower HP, but the increased deck thickness in the Dart block seems to have helped against that.

Given this engine has a very larger 96mm stoke, the pistons do unshroud from the bottom of the bore. This extreme travel and angle of the piston combined with high engine speed, will ultimatly start to wear the piston skirts, causing the scuffing shown above.

We did find an area of concern in the rod bearings. One rod bearing in particular showed the patterning shown above. Upon talking with Clevite, they informed us this shows the bearing having suffored overlay fatigue. This is likely due to a compromised oil film, which would make alot of sense given our use of the OEM wet sump oiling system at these power levels. He also noted the bottom bearing wear common culprits are high piston speed and heavier rotating assembly weight. Given we were using a steel rod, on a heavy wrist pin, and a heavy piston on a compromised oil film, all at high engine speed, this falls in line with what we expected.

Before we re assemble this engine to go back in for more testing, we'd like to hear what engine combination you'd like to see go together with this block. We hope you enjoyed this teardown, and learned something with us, and we'll see you next time.


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