EJ20 wrist pins in EJ25

downest · 10-25-2010, 09:54 AM

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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sidewayz · 10-25-2010, 10:02 AM

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

10-25-2010, 09:54 AM	#1
downest Scooby Newbie Member#: 194343 Join Date: Nov 2008 Chapter/Region: NESIC Location: West Kingston, RI Vehicle: 1990 CRX B18C5 turbo REDISH	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? * Registered users of the site do not see these ads.

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10-25-2010, 10:02 AM	#2
sidewayz Scooby Specialist Member#: 5810 Join Date: Apr 2001 Chapter/Region: Tri-State Location: Easton PA Vehicle: 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