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frankenmotor worth it?
Posted 30 January 2013 - 12:28 AM
Posted 30 January 2013 - 07:41 AM
match the displacement to be precise - so EJ25.
As to reliability - there's no concern. It's just an EJ head bolted to an EJ engine. It's the same Subaru head, headgasket, and block...just different bores, no big deal. So it's no different than any other Subaru EJ engine.
It's usually an economic decision.
EJ25's are far more expensive and harder to find in known excellent condition than EJ22's. EJ25's easily sell for $1,000. Ej22's are easily had for $300.
EJ25 are not the most reliable or easy to find for cheap in known, excellent condition. You can google "EJ25 headgasket" and read for an entire year if you're not familiar with their propensity to eat headgaskets and lower end bearings.
There's a million ways in which either way is a good fit though...based on cost, ease of maintenance, easy upgrade for a bit of power...etc.
I'm practical so I'd go for the EJ22 swap. It's cheap and a HUGE upgrade from an EA82, I don't need more than that. Heck I'd probably install an EJ18. You sound like you want more out of your Subaru's so you might like the 20 (EJ25) or more (FM) hp bump, go for the frankenmotor!
Posted 30 January 2013 - 04:10 PM
If you do the basic 22 heads on a 25 block and leave it at that, you should be happy with it.
I have cams, injectors, piggyback ecu, intake spacers, oversize valves, pnp, and etc... and will just be getting around to getting it tuned in February.
Keep it simple.
Posted 02 February 2013 - 11:26 PM
A 90-96 ej22 you can continue to run naked. Any EJ25 you will need to run covers because of the interference design of the block.
Franken motor offers about 30 more HP, but you pretty much have to use premium fuel or it will ping.
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