Fixing the Subaru EJ25 Engine! The Weak Points..

After blowing the Engine, it is time to rebuild with Forged Internals!

From the last video, we tore the engine down and found that the EJ25 STi Short Block that we've recently built had two cracked ringlands. The original engine only had 10,000 miles and we were extremely sad to see it go so soon. This time we've decided to build the engine with forged internals since we plan on upgrading the turbo as well as doing some track events with it year round. This engine in particular features custom JE Forged pistons that are 99.75 in diameter and made for a stroker crank. The reason why we did this is because they are going to be paired with Manely +2mm rods. This means that the rods are 2mm longer than OEM rods which has many benefits. Just a simple piston and rod motor like this is capable of handling up to 600 HP. With our power goals we won't be needing to close deck the engine.

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[timjs]

YES! That's the proper way to measure ring gap, one feeler, held on its edge. It gives the best tactile feel. I cringe when other guys use the whole feeler gauge stack and start stabbing at the ring gap with it.

[matthewferreras]

great video. Thanks for sharing your process. I'm building my 06 STI now. just got my IAG stage 4 extreme block the other day! Best of luck!

[satoshibautista]

I'm a newbie on this whole thing but something I've always wondered is, when you check the bearing specks with the case halves bolted together there isn't any rvt sealant on the halves. But when you're ready to finally put it together then you put sealant on the halves. Does the sealant not change the bearing tolerance?

[StutlaProduction]

At 7:10 what aluminum adapter block are you using to secure it to the vise? Thanks @PM Autoworks

[drakevelazquez]

What is the wrench for con rod stretch bolt. I like that it lets you watch stretch in one shot

[jeffreycrawford]

Great content, I was wondering if you could give me the part numbers for the Manly rods and J& E piston you used that are 2mm longer to match. I'm currently building the same engine.

[obardThawn]

How long does it take to rebuild an engine???
You make it look easy ...

[Happydays-wz]

Just curious why you guys didn’t close deck the block?

[selvinmontes]

What do you recommend? My car has blowby since I made grimmspeed modifications for more power .. I use a little more than a quarter of oil per gas tank, can I change only pistons and rings or I have to put a short block iag

[christopheredwards]

All that work, all them nice strong internals, but on a semi closed block?. The whole reason you build a forged motor is to remove 'all' of the ej257 weaknesses. One of them being the thin cylinder walls prone to cracking. Build it once, build it properly. 👍 Great videos though 👌

[jimjones]

How much did this all cost? For if I were to do build my engine?

[willlucas]

Any reason you stayed open deck besides cost?

[aquapisces]

the title is irrelevant to the content