This is a discussion on How to prevent ringland within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Originally Posted by JStevens 255 is the N/A engine, 257 is turbo'd Sent from my GT-P3113 using Tapatalk 2 Ok ...
Correction accepted, brain farther on my part.
Yes, the 253 is the N/A engine
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I don't know if the pistons in the ej255 are really any stronger or not. The pistons are the weak point in every turbo charged ej series motor.
The newer STis have adopted the much-touted hypereteutic pistons; Subaru made a big deal of this before voices in the wilderness cried out, suspecting that a bug was reinvented as a feature.
From my view the new pistons were the right move to make, but not because of their strength. They are intended to reduce emissions, and that's far more important (though I admit if one's car has a blown piston the finer points of clean air design are harder to appreciate...).
Still, more cars run than don't, so more cars pollute than have blown pistons and the overall concept is not unsound.
Now, as to whether something can be done to prevent a failure, I suppose the first thing I'd do is leave the car alone provided the factory map is adequate. The failures seen I don't think could have been prevented on the stock cars; on modded cars maybe they could, maybe not, but the owner is paying anyway.
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It ain't a 4G63, that's for sure. I wouldn't trust a stock ej series motor past 380whp, and anything over 27psi boost has the potential to crack cylinder walls.. I've put probably over $12,000 into my ej, and I'm still limiting boost to keep the power and strain on the engine down.
Why does everyone praise the ground that subarus walk on, if they have soft motors? The stats you listed aren't bad, but to see stock motors fail is pathetic.
Everyone always say, "Subarus are so reliable, this & that", but is this true? If you have to change your oil every 3k miles, but you can't use x brand of oil. You have to check your oil every day almost. Even after this is complete, you can't still have a failed motor. Is this reliability?
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There's a big difference between a reliable motor at stock power levels and a motor at 400+whp. EJ series motors are very reliable at stock power levels. But it is an aluminum block with cast pistons. The 4G63 has an Iron block and forged pistons (which does not pass recent emissions laws).
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UOA is the only way to tell if your oil and filters are doing what they are supposed too. So far my Subaru seems pretty reliable. 190K on the original motor and tranny running 20+ psi on several different flavors of turbos. I just recently had to change the factory halfshafts and ball joints. Reliability is also subjective. Is my car reliable or am I just lucky? The biggest variable for "reliability" is the owner/driver in my opinion. Doesn't help when people run around putting 87 or 89 octane in because they can take the time to read their owner's manual and understand the information or do clutch dumping donuts and then complain about "reliability".
Last edited by Donkey; 08-05-2012 at 07:29 AM.
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