Ringland failure is usually caused by detonation which can commonly happen when loading up the car at low RPMs. Think accelerating in 6th gear (hitting full boost at 3,000 rpms). So even if you aren't beating on your car, you can accidently cause this type of failure.
Bummer about the ringland, but it happens with OEM pistons and a little bit of detonation. Depending on your power goals, having your stock block machined, with new forged pistons/aftermarket rods should be able to hold a lot of power, at a decent price point. And thanks for your business! -Mark
The only thing I can think of is the previous owner. That is a lot of damage for 30K miles. Most I've seen fail around 80K. I eventually want to go closed deck with forged rods and pistons. Would be dope to see you build it yourself. Good luck!
RA block is nothing special. Unfortunately this can happen but usually when you're over boosting. This also happened to me on the dyno. There was no knock event or a drop in DAM. What happens is the ring expands beyond the gap. The ring has no place to go but upwards. I purchased an AIG750 as a replacement.
I aint nervous much about by 21k 21' STI blowing (Sweating as I watch this video). If mine goes, I'll bite the bullet and go get me an IAG 750 Long Block.
Good learning for you. If you owned a leak down tester that would have isolated the issue and located it. At TDC on cylinder 4, you can shoot air into the cylinder and it would have leaked past the ring and into the crankcase, pop the oil cap off and you would have heard the air escaping from that point which tells you the failure is in the bottom in not the top.
I had ringland failure. People think its from abusing the car but it can happen from normal spirited driving. The type ra pistons are not stronger its a myth, made of the same material. I drove knowing i had ringland failure for 3k miles trying to have a critical engine failure and it never happened and the cylinder walls were perfectly fine when i opened it up. I bought some drop in pistons and a ball hone and called it a day and it held up for 5k miles. Sold the car 2 weeks ago to a dealer. Subaru made me not want another gas car i drive a tesla now because those have like 2 moving parts
RA block or not, the problem is the ring placement on the piston. The Subaru pistons and top compression ring is super high on the piston. The aftermarket pistons move that top ring down quite a bit. Why is Subaru not fixing it? Well it has everything to do with EU and EPA and carbon burning. Wish they would stop hyping the RA block. Also noted just slapping forged pistons into the block is an option but the piston to wall clearance is important. That's why you see . 25 over bore pistons in IAG blocks. They make the piston to wall clearance perfect. Just buy the IAG short block.
Cool vid. just wanted to ask a quick question for future preference. Before your ring land failure, Did you have a pro-tune or a cobb OTS stage map tune, when you installed the air intake?
The 19'+ RA stuff isn't any stronger than previous years. Slightly different machining on the pistons, but that's it. I have a 2016. FBO, tune pending. I'd say give the 750 block from IAG some thought.
What oil was you using and how often was your intervals? Also was it on a protune or ots tune? Im thinking it ran lean on that cylinder or Oil rings might got gunked up
Pre ignition 100% , better check your octane , or your tuner. Rods might even be bent. Just blew my 1.8 Miata on 11lbs of boost , stock internals blew out ring lands also. Only did 3 pulls to redline dialing my fuel mixture on dyno .Didn't even hear any detonation , but that's what caused it. I just got it back together after a month all forged parts. Should be good for 600hp if tuned correctly ? I've got it dialed down to 6lbs. , until I put at least a thousand miles on it.
Yeh ive seen ringland failure on cylinder 2 on the same motor along with cylinder 4 Im doin wider ring gaps heard of people doing that preventing ringland failure
@ Get forged internals…i drive the piss out of my sti alot…75k miles on a rebuild with forged internals. I call it, cleaning the spark plugs. Gotta get them hot
Ringland failure is usually caused by detonation which can commonly happen when loading up the car at low RPMs. Think accelerating in 6th gear (hitting full boost at 3,000 rpms). So even if you aren't beating on your car, you can accidently cause this type of failure.
Bummer about the ringland, but it happens with OEM pistons and a little bit of detonation. Depending on your power goals, having your stock block machined, with new forged pistons/aftermarket rods should be able to hold a lot of power, at a decent price point. And thanks for your business! -Mark
Thanks for making this teardown a whole lot easier!
Shoutout @SMEEDIA for the Valve Grind Compound tip. Makes a world of a difference when removing those cam gear bolts!!
Lifesaver🙏🏻
for real, didn't strip a single one of mine when i did it
The only thing I can think of is the previous owner. That is a lot of damage for 30K miles. Most I've seen fail around 80K. I eventually want to go closed deck with forged rods and pistons. Would be dope to see you build it yourself. Good luck!
RA block is nothing special. Unfortunately this can happen but usually when you're over boosting. This also happened to me on the dyno. There was no knock event or a drop in DAM. What happens is the ring expands beyond the gap. The ring has no place to go but upwards. I purchased an AIG750 as a replacement.
I hope I don’t get this problem. I’m at 43k miles & completely stock motor. It’s my daily too lol
I aint nervous much about by 21k 21' STI blowing (Sweating as I watch this video). If mine goes, I'll bite the bullet and go get me an IAG 750 Long Block.
Good learning for you. If you owned a leak down tester that would have isolated the issue and located it. At TDC on cylinder 4, you can shoot air into the cylinder and it would have leaked past the ring and into the crankcase, pop the oil cap off and you would have heard the air escaping from that point which tells you the failure is in the bottom in not the top.
I had ringland failure. People think its from abusing the car but it can happen from normal spirited driving. The type ra pistons are not stronger its a myth, made of the same material. I drove knowing i had ringland failure for 3k miles trying to have a critical engine failure and it never happened and the cylinder walls were perfectly fine when i opened it up. I bought some drop in pistons and a ball hone and called it a day and it held up for 5k miles. Sold the car 2 weeks ago to a dealer. Subaru made me not want another gas car i drive a tesla now because those have like 2 moving parts
RA block or not, the problem is the ring placement on the piston. The Subaru pistons and top compression ring is super high on the piston. The aftermarket pistons move that top ring down quite a bit. Why is Subaru not fixing it? Well it has everything to do with EU and EPA and carbon burning. Wish they would stop hyping the RA block. Also noted just slapping forged pistons into the block is an option but the piston to wall clearance is important. That's why you see . 25 over bore pistons in IAG blocks. They make the piston to wall clearance perfect. Just buy the IAG short block.
I’ve got something planned😎
Stock EJ ring walls, sadly, are pretty thin. So even the slightest bit of detonation is no good
Cool vid. just wanted to ask a quick question for future preference. Before your ring land failure,
Did you have a pro-tune or a cobb OTS stage map tune, when you installed the air intake?
Cobb ots but I don’t think that this failure is related to the tune. I don’t beat on my cars either.
@@Sam_StuckeyCobb OTS maps are not the best I've heard.
At 30k mi the car should still be under warranty
At least the drivetrain is
The 19'+ RA stuff isn't any stronger than previous years. Slightly different machining on the pistons, but that's it. I have a 2016. FBO, tune pending. I'd say give the 750 block from IAG some thought.
What oil was you using and how often was your intervals? Also was it on a protune or ots tune? Im thinking it ran lean on that cylinder or Oil rings might got gunked up
Ams 10-40 every 3k
Pre ignition 100% , better check your octane , or your tuner. Rods might even be bent. Just blew my 1.8 Miata on 11lbs of boost , stock internals blew out ring lands also. Only did 3 pulls to redline dialing my fuel mixture on dyno .Didn't even hear any detonation , but that's what caused it. I just got it back together after a month all forged parts. Should be good for 600hp if tuned correctly ? I've got it dialed down to 6lbs. , until I put at least a thousand miles on it.
Yeh ive seen ringland failure on cylinder 2 on the same motor along with cylinder 4
Im doin wider ring gaps heard of people doing that preventing ringland failure
How were you driving this car? Non-stop full throttle? Dam
LOL, probably goin WOT in 5th and 6th under 3k rpm
I don’t beat on my cars, but I am the second owner😅
@ Get forged internals…i drive the piss out of my sti alot…75k miles on a rebuild with forged internals. I call it, cleaning the spark plugs. Gotta get them hot
Its an ej there's always problems.
I had a similar situation with my civic si. Motor pulled and it had crank walk. Previous owner must have put my car through the ringer
bro noo why did it have to do the piston-like that, let me know I would love to help you out man in the rebuild I decent in an engine bay
should’ve done a leak down test before
☠️ nice knowing you stock motor. Don’t let the door hit you in the ass on the way out.
I know what's wrong with it, it ain't got no gas in it!
Jk...but hey at least piston 4 didn't become the next Saturn V Rocket...
piston rings
lmao typical suby