STI vs WRX block comparo (pictures)
03-06-2003, 12:21 PM
#1
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STI vs WRX block comparo (pictures)
Adam, John and I got together last night to tear down his USWRX EJ20 motor, and I thought we would take a few comparo pictures with the EJ207 block I have in the garage. (full details at http://www.wrxworld.com/projects/STIvsWRXEJ)
Here are the block pictures.
Here are the block pictures.
03-06-2003, 06:45 PM
#4
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Thank you. I finally understand exactly what a semi-closed deck is. 
What I don't understand is why Subaru spent the (large amount of) extra money to make an entirely new casing for the USDM block just to make it weaker. Can some one please explain??? Why in god's name did they feel like they had to make all our interals weaker? I know some of it is cheaper but the weaker block doesn't make any sense to me. (Then again I am not exactly well versed in the trade of large scale combustion engine manufacturing)
What I don't understand is why Subaru spent the (large amount of) extra money to make an entirely new casing for the USDM block just to make it weaker. Can some one please explain??? Why in god's name did they feel like they had to make all our interals weaker? I know some of it is cheaper but the weaker block doesn't make any sense to me. (Then again I am not exactly well versed in the trade of large scale combustion engine manufacturing)
03-06-2003, 10:08 PM
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you cannot come out with the best product evar and leave it at that. business strategies are to keep products in phases. this keep the consumer buying your latests and greatest stuff.
Also, not every customer can afford or want top notch stuff. So, they make variations of models.
chris
Also, not every customer can afford or want top notch stuff. So, they make variations of models.
chris
03-06-2003, 10:26 PM
#6
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Yes I understand how business works. You still did not explain why Subaru would spend an assload of money so they could mass produce a lower quality block when they could have just as easily stepped up production of their current blocks or replicated the castings of the current block. Paying extra money to make a product worse does not make business sense. It hurts the business and the consumer and creates a loss to society in general.
03-06-2003, 10:35 PM
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time and market planning may have had something to do with it.
It much like some well known OS's out there. They sell crap, just so they can get it to the market and let the public find the bugs. They know it will happen, but they want to stay ahead of the game and in the limelight. What may seem like a stoopid thing to do, from a consumer standpoint, is actually how some business survive in a fast paced environment.
It much like some well known OS's out there. They sell crap, just so they can get it to the market and let the public find the bugs. They know it will happen, but they want to stay ahead of the game and in the limelight. What may seem like a stoopid thing to do, from a consumer standpoint, is actually how some business survive in a fast paced environment.
03-07-2003, 09:02 PM
#9
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Steppin
I think that you may be a little confused or mabe I am
But the ej20 that we get is the same ej20 that all wrx's get
the STI is different
just talking about the castings I know that there are several market variations
I think that you may be a little confused or mabe I am
But the ej20 that we get is the same ej20 that all wrx's get
the STI is different
just talking about the castings I know that there are several market variations
03-08-2003, 10:19 AM
#10
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Originally posted by bamfwrx
Steppin
I think that you may be a little confused or mabe I am
But the ej20 that we get is the same ej20 that all wrx's get
the STI is different
just talking about the castings I know that there are several market variations
Steppin
I think that you may be a little confused or mabe I am
But the ej20 that we get is the same ej20 that all wrx's get
the STI is different
just talking about the castings I know that there are several market variations
It is possible there are other differences in the block in terms of metalurgy, but from looking at it externally, they are identical. The other internal componets are quite different, especially the rods, pistons, and head. But as for the block itself, it looks pretty much the same.
Jeff
03-09-2003, 01:34 AM
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Originally posted by sponaugle
Adam, John and I got together last night to tear down his USWRX EJ20 motor, and I thought we would take a few comparo pictures with the EJ207 block I have in the garage.
Thanks for posting those, Jeff. I've never seen a photo comparison like this. Is good!
Do you have any pics of the STi vs WRX connecting rods (piston assemblies off) side by side? Also, did you happen to weigh the two blocks and crankshafts? Would you happen to have an outside micrometer to measure the crank journals (or, do both cranks fit in both blocks)? I suspect they are the same size, but even a slight increase in journal size means more load-carrying capacity. Small-block Chevys crank journal size varied as displacement and engine output went up.
--
^ww^
"…axles of evil…" - George W. Bush
Adam, John and I got together last night to tear down his USWRX EJ20 motor, and I thought we would take a few comparo pictures with the EJ207 block I have in the garage.
Thanks for posting those, Jeff. I've never seen a photo comparison like this. Is good!
Do you have any pics of the STi vs WRX connecting rods (piston assemblies off) side by side? Also, did you happen to weigh the two blocks and crankshafts? Would you happen to have an outside micrometer to measure the crank journals (or, do both cranks fit in both blocks)? I suspect they are the same size, but even a slight increase in journal size means more load-carrying capacity. Small-block Chevys crank journal size varied as displacement and engine output went up.
--
^ww^
"…axles of evil…" - George W. Bush
03-09-2003, 08:26 AM
#12
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Jeff,
Did you happen to take pictures of the actual combustion chambers on the heads? How about the intake and exhaust ports?
By the way, those pistons explain a lot about the STI motors, but I’d like to see how the quench area lines up with the STI heads.
-Nathan
Did you happen to take pictures of the actual combustion chambers on the heads? How about the intake and exhaust ports?
By the way, those pistons explain a lot about the STI motors, but I’d like to see how the quench area lines up with the STI heads.
-Nathan
03-09-2003, 09:20 AM
#13
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Originally posted by Wingless Wonder
Originally posted by sponaugle
Adam, John and I got together last night to tear down his USWRX EJ20 motor, and I thought we would take a few comparo pictures with the EJ207 block I have in the garage.
Thanks for posting those, Jeff. I've never seen a photo comparison like this. Is good!
Do you have any pics of the STi vs WRX connecting rods (piston assemblies off) side by side? Also, did you happen to weigh the two blocks and crankshafts? Would you happen to have an outside micrometer to measure the crank journals (or, do both cranks fit in both blocks)? I suspect they are the same size, but even a slight increase in journal size means more load-carrying capacity. Small-block Chevys crank journal size varied as displacement and engine output went up.
--
^ww^
"…axles of evil…" - George W. Bush
Originally posted by sponaugle
Adam, John and I got together last night to tear down his USWRX EJ20 motor, and I thought we would take a few comparo pictures with the EJ207 block I have in the garage.
Thanks for posting those, Jeff. I've never seen a photo comparison like this. Is good!
Do you have any pics of the STi vs WRX connecting rods (piston assemblies off) side by side? Also, did you happen to weigh the two blocks and crankshafts? Would you happen to have an outside micrometer to measure the crank journals (or, do both cranks fit in both blocks)? I suspect they are the same size, but even a slight increase in journal size means more load-carrying capacity. Small-block Chevys crank journal size varied as displacement and engine output went up.
--
^ww^
"…axles of evil…" - George W. Bush
And even more amazingly, he claimed to have put it all back together and installed it in his car. Now I actually enjoy working on my car, but I KNOW that if I decided to take apart my tranny, it would NEVER work correctly again. If it ever worked at all. WW: I did not know that about the mouse motors. Very interesting info.
Jeff, Please post more pics of everything, especially the heads and pistons like Nathan asked for. That would be simply awesome.
Nathan: Would you explain what the quench area is for all the n00bs who are reading this and don't know. Perhaps we could have a little "fundamentals of combustion engine building" seesion here.
03-09-2003, 10:26 AM
#14
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Originally posted by Wingless Wonder
Do you have any pics of the STi vs WRX connecting rods (piston assemblies off) side by side? Also, did you happen to weigh the two blocks and crankshafts? Would you happen to have an outside micrometer to measure the crank journals (or, do both cranks fit in both blocks)? I suspect they are the same size, but even a slight increase in journal size means more load-carrying capacity. Small-block Chevys crank journal size varied as displacement and engine output went up.
Do you have any pics of the STi vs WRX connecting rods (piston assemblies off) side by side? Also, did you happen to weigh the two blocks and crankshafts? Would you happen to have an outside micrometer to measure the crank journals (or, do both cranks fit in both blocks)? I suspect they are the same size, but even a slight increase in journal size means more load-carrying capacity. Small-block Chevys crank journal size varied as displacement and engine output went up.
The blocks are identical in weight as far as my scale could see. I'll weigh the cranks, but they feel exactly the same. More to come..
Jeff
03-09-2003, 11:05 AM
#15
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Yeah baby, keep it coming.
Would someone be kind enough to advise on appx how much an EJ207 short block would run? Also. would that even make sense because one of the real advantages of that motor is the AVCS? Would it be better to just buy the whole thing?
Would someone be kind enough to advise on appx how much an EJ207 short block would run? Also. would that even make sense because one of the real advantages of that motor is the AVCS? Would it be better to just buy the whole thing?