Rebuilding Stock Engine, JDM Evo3 Rod vs. 2g Rods?

[InfiniteGSX]

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Top: Evo3 (9-1 Comp Damaged Pistons), Bottom: 2g DSM (8:5.1 Comp Spun Rod Bearing on one Rod)

DSM: The Spun rod bearing did some damage to the DSM Motor. But the rod doesn't look, or feel bad. It has marks but cannot feel any pits or extra metal or scratches or nothing, finger nail slides on it the same as the other perfect condition 3. All Pistons are good, and float freely. The engine honestly looked severely low mileage, very beautiful on the inside.

Evo3: Well this thing looks nasty. Head and block are brown on the insides. Rods are brown. No damaged bearings. But the Piston rings went splaaaattttt all over the cylinder walls and destroyed the pistons. They do not float freely on the wrist pins. Rods Physically look great minus the brown.

Currently I'm just rebuilding one of the blocks with ACL Bearings and new everything else. Just a stock re ring. Evo3 motor has already been honed and looks great. Crankshaft is in great condition with no damaged bearings, esp the thrust bearing. But ACL's will be installed.

My main question is the Rods. First off, Are the Evo3's better or worse than the 2g's. They do have different numbers. And with the extremely light, hardly noticeable scoring on the single 2g rod that you cannot feel, only see no shiny surface, is it able to be re used?

Thats it so far, I might post up more questions as I go. Its been like 10 years since I've rebuilt my own engine.

 

[DSMReviver]

I would check both of them out, for the roundness and see if the big end and small end are within specs. And see what the overhaul manual have to say. Form the pic evo and 2g rods, looks the same to me. Unless one is bigger then the other then, the choice is obvious (choose bigger rods).

Evo3 and 2g dsm should have the same rod length

 

[InfiniteGSX]

They look the same physically, except the different code on the evo rods and pistons. and visa versa. The Evo rods don't look bad, just the pistons are not free floating on the wrist pins, and the 2g's, one rod has that light scoring from a spun rod bearing but all else is perfect shape.

 

[DSMReviver]

Yeah in that case you can just replace the 2g spun rod with the evo rods. Far as i know they are the same rods. Make sure the rods are similar in weight but they should be. Balance everything from each pistons to each rods. After that just reassemble them.

 

[InfiniteGSX]

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Thats the rod. The rest are shiny. Not re usable is it?

Also that rod's piston, it moves freely but not the same as the other 3 which just flap around like they should. So I think either that is damage from the rod bearing failure or that might have been the cause of the bearing failure. Putting excessive force on the bearing which caused it to spin

So I have 4 good rods from the Evo Motor, 3 Good Rods from the Eclipse Motor. And only 3 good pistons! I guess time to order some cheap OEM Pistons somewhere.