Fixing the Subaru EJ25 Engine! The Weak Points..
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- Опубліковано 7 тра 2021
- 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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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!
Thanks!
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.
Like your video, very detail.
Thank you!
Amazing!
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?
more rod to stroke ratio. nice
What is the wrench for con rod stretch bolt. I like that it lets you watch stretch in one shot
How long does it take to rebuild an engine???
You make it look easy ...
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.
Could you provide the part # of the manley rods & the JE Piston so I get the right ones. Thank You.
At 7:10 what aluminum adapter block are you using to secure it to the vise? Thanks @PM Autoworks
Do a build on a ez30 or a h6
Just curious why you guys didn’t close deck the block?
Great Video!!!!! One question tho why open deck?
It's all we need for our horsepower goals. 450whp
Why not use an iag block too
How much did this all cost? For if I were to do build my engine?
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 👌
True although it depends on what your power goals are. At our goal of 450 whp this motor is all we need.
@@PMAutoworks they crack at even stock power levels. Due to detonation and heat cycles. Here in the uk closed decking is a must, during a forged build. Although, some builder go closed deck at 400hp at the crank max. I here iag say 475whp or 550hp lol. Which is fine and some may last, personally I would not risk it. Build it once, build it properly.
@@christopheredwards357 Stay tuned to see what happens to this block! We are tuning it today and will post a video.
@@PMAutoworks hey i would to speak with you about the price of doing this. Please HMU.
I agree. Why would you not close deck the block when it was there to be done. Later if you want more power your have the foundation to do so. It’s about $800 here in Australia to have the inserts put in. It’s a no brainer to keep those cylinder walls solid.
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
Do you have an Air and Oil Separator (AOS)? If you don't, then you should get an IAG AOS and go from there. EJ engines will consume oil regardless, however, depending on how much oil is consumed per 1000 miles you may or may not need to replace the short block. Subaru considers a quart of burned oil every 1,000 miles to 1200 to be acceptable. Of course, that's if you have an OEM Short Block. Aftermarket Short Blocks such as IAG will provide their own oil consumption sheet for every 1000 miles.
Before buying a new short block, I would do a compression test to make sure is indeed your ring-land causing the blowby/oil consumption. Just because you are consuming oil, it doesn't necessarily mean the pistons are cracked. It could be other components consuming oil such as worn valve guides and seals depending on how many miles you have in your motor. But then again, anything is possible with these Subaru engines.
Changing only one piston will not fix any issues at all because if you indeed crack a ring land, it is just a matter of time until the other pistons fail as well. I always recommend replacing the entire Short Block at a minimum but that is just my professional opinion.
I hope you find this information helpful.
@@xXJhenkillerPR thanks u ... My car has 110k.... The car i drive only 100 mille and use 1/4 oil .. is to much ......the information help a lot
Hi Autoworx, I currently have a 2012 wrx with a factory ej255. Soon I would like to have the engine built. I'm a fter a performance street car that will handle 400whp. Would I ve better of replacing the whole engine with an EJ207 or go with an ej257?
Really appreciate iate your help
IN same spot with the ej255 IN A 2010 FORESTER XT what you end up doing
Any reason you stayed open deck besides cost?
Mostly because for the power we plan on running it isn't necessary. And since it wasn't necessary we decided to save the money and put it else where. We are building for 350-450hp and don't plan on turning it up past that.
the title is irrelevant to the content