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Old 04-02-2013, 11:51 AM   #1
ClarkRP1027
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Member#: 331030
Join Date: Sep 2012
Default EJ25 Frankenmotor

I am planning on building a phase 2 Frankenmotor. I have EJ22 heads, (yes, it is the phase 2 MAP engine) and I want to add the shortblock from my 2000 Outback (EJ251) I need to get new bearings and new rods for it though, it spun a/some bearings and shaved a little bit off of one of the connecting rods. I was looking at throwing in STi connecting rods, but I would rather not use STi pistons because I am doing the build FOR the higher compression, (turbo's don't interest me) and I don't want to drop the CR. Would I be able to use the rods without changing anything else internally? I found a set of EJ257 rods for 100 bucks from a 08 motor with 7k miles. I can get the pistons for an extra 100 on top of that..
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Old 04-02-2013, 11:56 AM   #2
ClarkRP1027
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Okay, it was late at night when I last looked at this motor, there is no grinding on the bottom of the rod -.-' I feel like an idiot now.. Anyway, I am still interested in using STi rods in this build, any help?
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Old 04-02-2013, 12:30 PM   #3
KOJAK-02-WRX
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STi rods are 130.5mm while the EJ251's are 131.25mm so you would need to buy smaller dished pistons to make up the compression from the shorter rods.
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Old 04-02-2013, 12:47 PM   #4
ClarkRP1027
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Any ideas on how much the compression would drop if I didn't source new pistons? Also, do you know of any stock subaru pistons that are a smaller dish than the ej251 pistons? That fit in an EJ251?
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