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Old 02-04-2011, 01:03 PM   #1
OneManArmy
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Member#: 36154
Join Date: May 2003
Location: Santa Cruz County
Vehicle:
2004 WRX Wagon
White

Default ej255/ej205 hybrid?

I'm finding a ton of info bad/good/mixed on ej257 but very little on 255.

I spun a rod bearing and I'm trying g to decide what to do. I'm leaning toward using as much of my ej205 (04 wrx) as possible. I really want to run a built ej255 block but I keep reading all these hybrid issues and its got me rethinking just stroking my 2.0.

This will be a daily driver with reliability first priority and torque second.

Any info would be helpful. I am Good on using custom pistons but want to use a regular head gasket and I'm not sure about the head reworking.


Info please!!!
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Old 02-04-2011, 01:06 PM   #2
Nuke209
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Join Date: Feb 2006
Chapter/Region: MWSOC
Location: Minnesota
Vehicle:
2003 WRX
NF Performance

Default

pretty much the same thing as using the 257

if using older 255, then same thing
using newer 255, if using the stock 255 pistons, cr will be lower.

if using custom pistons, both 255/257 are going to be the EXACT same.
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Old 02-04-2011, 01:14 PM   #3
OneManArmy
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Probably going to use a piston ment for hybrid use but all thus chamber porting talk has me confused. So many people live and due by it and some are against it. If its so great why isn't everyone doing it and why can't I find more data on it?
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Old 02-04-2011, 02:11 PM   #4
Ryan314
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Chapter/Region: NESIC
Location: Maine
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Hybrid VF22

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JE makes a "hybrid" specific piston to lower CR if you are not planning on opening up the CC on the EJ205 heads. People have had success doing this but you still have head overhang and the possibility of hot spots leaving the heads unmatched. The safer more reliable bet is to get the heads opened up and get stock CR pistons.
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Old 02-04-2011, 07:34 PM   #5
RexWagonWA
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Default CNC Hybrid Heads

From your location, a field trip to EQ Tuning in Fairfield may be in order. I have some of their heads on my hybrid engine from Maxwell Power Services. It is a much cleaner combustion chambers. They have worked well to give a wide range of power. My tune is conservative. I probably will do E85 in the future.

Good luck on your build.
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