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Old 02-09-2004, 10:38 PM   #1
FlyingFishSandwich
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Default The Death of an Engine.

Can anyone walk me through how engines have detonated from a turbo under too much psi? What commonly gives out? (i.e. piston collapsed, ring blew, engine ejected through tail pipe, etc.)

On a personnal note: If anyone knows the diffrence between an 02 RS and an 02 STi engine, minus the turbo, Please fill me in.
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Old 02-09-2004, 10:46 PM   #2
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Mine blew the ring land on the number three, whci hthen bounced around and took out the head. 10psi on stock internals and poor tuning. The 2.5 STI block is closed deck with forged rods (I think) and cast pistons. It is also a better casting.
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Old 02-09-2004, 11:55 PM   #3
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Quote:
Originally posted by FlyingFishSandwich
Can anyone walk me through how engines have detonated from a turbo under too much psi? What commonly gives out? (i.e. piston collapsed, ring blew, engine ejected through tail pipe, etc.)

On a personnal note: If anyone knows the diffrence between an 02 RS and an 02 STi engine, minus the turbo, Please fill me in.
You can also blow the head gasket due to detonation.

The 02 RS and the 02 STi engine is totally different. 2.5 liter vs a 2.0 liter. What are you wanting to know. Different heads, different bore, different stroke, ..... about as different as you can get while still looking the same on the outside.
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Old 02-10-2004, 12:02 AM   #4
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The STi block is semi-closed if it's an 02.
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Old 02-10-2004, 11:27 AM   #5
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Quote:
Originally posted by pegdrgr
You can also blow the head gasket due to detonation.

The 02 RS and the 02 STi engine is totally different. 2.5 liter vs a 2.0 liter. What are you wanting to know. Different heads, different bore, different stroke, ..... about as different as you can get while still looking the same on the outside.
The 01 2.5 is still a 2.5 ltr.
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Old 02-10-2004, 11:28 AM   #6
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Differences? Cams, rods, pistons, wrist pins, deck design...its basically a completely different motor.
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Old 02-10-2004, 12:02 PM   #7
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Quote:
Originally posted by wrxpeed
The 01 2.5 is still a 2.5 ltr.
Who said anything about the 01? Secondly all 2.5RS are 2.5 liters. It is the STi that is 2.0 liter. Until the STi came to the US in 04 they were 2.0 liter. Infact everywhere else they still are.

CDVMA has it right, externally they may look the same, but inside there is little in common.
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Old 02-10-2004, 06:21 PM   #8
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Hmmm I was always under the impression WRXs were turbo 2.0s and STIs were turbo 2.5s. So to replicate the strenth of an STi engine to withstand high boost what should I change? Also if there are anymore turbo related deaths please share so that other may learn.
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Old 02-10-2004, 06:27 PM   #9
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Old 02-10-2004, 07:32 PM   #10
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U.S. 2004 STi has a 2.5 liter engine. EJ257 (I believe that's the code?...the Forester may have a slightly different code? not sure, since the block is the same for both, just some different internals).

Foreign STi's of past and present are all variants of the EJ20. Not the same block as the U.S. WRX, but some similarities. Changes for each year.

The U.S. RS's have a 2.5 liter block. It's not the same as the '04 STi block. It's an EJ25, not an EJ257.

Your fears about what may happen to the engine are founded in fact and mis-information. If you want to turbo your car to 400HP (I'd assume at the crank), like you said in another thread(I think it was you, if not..I apologize), just get an EJ257 to start. You'll spend so much money upgrading your block and it's just not worth it for most people. You will need to upgrade some of the STi block's parts to get that kind of horsepower reliably, but not near what you need to do for the EJ25 block.
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Old 02-10-2004, 09:42 PM   #11
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Quote:
Originally posted by Charge
U.S. 2004 STi has a 2.5 liter engine. EJ257 (I believe that's the code?...the Forester may have a slightly different code? not sure, since the block is the same for both, just some different internals).

Foreign STi's of past and present are all variants of the EJ20. Not the same block as the U.S. WRX, but some similarities. Changes for each year.

The U.S. RS's have a 2.5 liter block. It's not the same as the '04 STi block. It's an EJ25, not an EJ257.

Your fears about what may happen to the engine are founded in fact and mis-information. If you want to turbo your car to 400HP (I'd assume at the crank), like you said in another thread(I think it was you, if not..I apologize), just get an EJ257 to start. You'll spend so much money upgrading your block and it's just not worth it for most people. You will need to upgrade some of the STi block's parts to get that kind of horsepower reliably, but not near what you need to do for the EJ25 block.
I like what you say, and will just the EJ257 short block be enough. I found this site. I'm going to be learning alot about engines putting this in. Then turbo, transmission and exaust should be all I need to get started. What am I over looking?
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Old 02-10-2004, 11:17 PM   #12
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search
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Old 02-11-2004, 02:47 AM   #13
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Quote:
Originally posted by White 2.5rs
search
Please do.

The ej257 2.5L STi block and the XT 2.5L block are the same dam thing.

The difference from a ej251 to ej257/55 totaly. Nothing the same, save for the fact it has pistons, rods, and a crank. Im not sure but I think the CCs are different. The ej257 will slap on to RS heads. I think White 2.5rs is using such a set up.

Quote:
Originally posted by FlyingFishSandwich
Hmmm I was always under the impression WRXs were turbo 2.0s and STIs were turbo 2.5s. So to replicate the strenth of an STi engine to withstand high boost what should I change? Also if there are anymore turbo related deaths please share so that other may learn.
The wrx is an open deck 2.0, not the same as the jdm ej 207 STi 2.0L.

Please please do yourself a favor and go to the site supermarkus posted www.spdusa.com and read there his tech info.
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Old 02-11-2004, 11:01 PM   #14
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Wow totoherbs this is just what I was looking for, being pointed in the right direction. I have searched for hours and found nothing(I'm out of practice). If you or anyone else has more links or resources of any kind, please let me know. Also If you have any info that you feel is important and the FAQ missed feel free to share. Thank you.
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Old 02-12-2004, 08:31 AM   #15
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Quote:
Originally posted by FlyingFishSandwich
Wow totoherbs this is just what I was looking for, being pointed in the right direction. I have searched for hours and found nothing(I'm out of practice). If you or anyone else has more links or resources of any kind, please let me know. Also If you have any info that you feel is important and the FAQ missed feel free to share. Thank you.
Ya, ive got some links saved... what exactly are you looking for? Ill post some later, they arnt on this computer.
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Old 02-12-2004, 06:10 PM   #16
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Well anything like this, simple, not too much to wade through. Anything that could pertain to my situation at hand, the search for power. When in doubt post them all, if thats not too much trouble, because knowledge is power. I think I broke the corn-o-meter on that one.
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Old 02-12-2004, 06:43 PM   #17
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Quote:
Originally posted by FlyingFishSandwich
Well anything like this, simple, not too much to wade through. Anything that could pertain to my situation at hand, the search for power. When in doubt post them all, if thats not too much trouble, because knowledge is power. I think I broke the corn-o-meter on that one.



2.5 STi block threads...
http://forums.nasioc.com/forums/show...hreadid=489989

http://forums.nasioc.com/forums/show...&highlight=STi

rs/sti swaps.

http://forums.nasioc.com/forums/show...ight=sti+block

http://forums.nasioc.com/forums/show...ight=sti+block


Also, if you read threw the spd web site it might help you in searching for things.
places like...

http://forums.nasioc.com/forums/show...hreadid=495863

The links I posted to in that thread are all to shops with good reps
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Old 02-13-2004, 06:01 PM   #18
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Hey thanks alot, few people go out of their way to help. The Idea of a message board like this is to give help and to get help. Once again I thank you.
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Old 02-14-2004, 12:16 AM   #19
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Default Re: The Death of an Engine.

Quote:
Originally posted by FlyingFishSandwich
Can anyone walk me through how engines have detonated from a turbo under too much psi? What commonly gives out? (i.e. piston collapsed, ring blew, engine ejected through tail pipe, etc.)

On a personnal note: If anyone knows the diffrence between an 02 RS and an 02 STi engine, minus the turbo, Please fill me in.
more then anything else in subaru motors I've seen ringlands blow out. most commonly I've seen them blow because of either over boosting ( but not overly lean) or being too rich (excess fuel getting under the rings and detting).
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Old 02-14-2004, 12:25 AM   #20
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Quote:
Originally posted by STiTuner
more then anything else in subaru motors I've seen ringlands blow out. most commonly I've seen them blow because of either over boosting ( but not overly lean) or being too rich (excess fuel getting under the rings and detting).
Ya, that is a big point, I have seen a few tuners talk about it. But its only at extreme levels. The same levels that will oval a opend deck block.

Quote:
Originally posted by FlyingFishSandwich
Hey thanks alot, few people go out of their way to help. The Idea of a message board like this is to give help and to get help. Once again I thank you.
No problem, after spending way to much time here trying to figure things out I know how it feels. People saying noob do a search, or calling you on things you dont know little about just to make themself look better. Now when I get called on suff I just take it and say thanks didnt know that. *rand off*

Last edited by totoherbs; 02-14-2004 at 12:33 AM.
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