Hybrid build or EJ20 with rods and pistons? - Subaru WRX Forum
 
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#1 Old 12-12-2010, 08:54 PM
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Hybrid build or EJ20 with rods and pistons?

I need help deciding if i should go with the hybrid build or the ej20 with pistons and rods. The thing is if i go hybrid i need to send the heads out to compensate for the bigger bore of the ej25 block, otherwise i would get detonation due to the edges of the ej20 head. How much would it cost for the head job? My budget is about $2000, so if i do the hybrid i can get a rebuilt ej25 short block for about $1000 so that would leave me with $1000 left. If I go with a mild build for ej20 rods, pistons and bearings would cost me about $850. I want to achieve at least 300hp, but would like the engine to withstand about 400 to 450hp safely in case i decide i want more power. Does anyone have any ideas or help they can offer me?

Last edited by dca6029; 12-13-2010 at 01:33 AM.
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#2 Old 01-02-2011, 01:29 PM
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I'm a fan of the hybrid build myself, more diplacement is almost always a good thing, but if im not wrong (and I could be), If you haven't upgraded your transmission in your WRX, 300hp will be pushing close to the max that transmission will handle safely. Also with a good tune, your block should safely be able to handle 300 no probs, I have read that they can handle anywhere from 320whp to 400 whp on a stock block (anyone please correct me if I'm wrong). Another one of the WRX builders/tuners where I live said that he has seen the ej20's handle 500hp on a stock block, I'm not sure how long it held it though.
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#3 Old 01-02-2011, 01:36 PM
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Keep in mind that you need ~$400-600 in parts to put the engine back together.
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#4 Old 01-02-2011, 09:02 PM
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Im thinking of just replacing the engine bearings in my ej20 and just pick up parts to build a ej25 as i go. This way i dont have to rush things and with time will have enough money and knowledge to fully build a ej25. is $250 for bare ej25 block a good deal? Does anyone know if i have to pull the whole engine to just change rod bearings?
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#5 Old 01-03-2011, 09:33 AM
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$250 for a good EJ25 is good. I paid $375 for a block and crank, and the block needs a bore and hone ($150).

Yes, you need to pull the whole engine to change rod bearings. Unfortunately the H-4 is not like any other engine, you can't just pull the head and oil pan and pull all your pistons and rods out.

-Chris
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