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Old 10-25-2010, 10:54 AM   #1
Scooby Newbie
Member#: 194343
Join Date: Nov 2008
Chapter/Region: NESIC
Location: West Kingston, RI
1991 CRX B18C5 turbo
'88 4Runner daily

Default EJ20 wrist pins in EJ25

Not sure if this is the best place, but seems to be where people who may know about this stuff would see it...

Tore down a 257 for a build last week, stock 2004 STi EJ257, swapped in one of my core shortblocks with CPs. I tore down the old block and found this when I removed the pistons:

Anyone ever seen that before? The 2 liter pin was on the #4 piston, I figured Subaru or someone must have replaced the piston earlier in its life. From what I have seen (I have limited EJ20 experience) the pin with the tapered inside is from an EJ20, while the rest are obviously normal EJ25 pins. Could there be any detrimental effects from using the incorrect wrist pin? Are there any other major differences between the two?
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Old 10-25-2010, 11:02 AM   #2
Scooby Specialist
Member#: 5810
Join Date: Apr 2001
Chapter/Region: Tri-State
Location: Easton PA
2001 S366 2.5RS


Huh. That's really weird. Some one must have lost one haha. The only thing I can see is a weight difference. And maybe harmonics
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