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Old 01-15-2006, 05:22 PM   #26
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the open deck= bad is a myth subscribed to by noobs and idiots. everythinng from 1995 ej20G up is open deck. you get better cooling.
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Old 01-15-2006, 05:45 PM   #27
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im better cause im cooler! /\/\/\/\/\/\/\ ha!
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Old 01-15-2006, 07:49 PM   #28
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Quote:
Originally Posted by scobaru
I don't think Any turbo subarus were open deck they were eather semi closed or closed....
There are a LOT of open deck turbo subarus.

Just to note I wasn't trying to start an arguement about the open, closed, semi deck, just wanted to confirm/deny what I thought.
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Old 01-15-2006, 11:28 PM   #29
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ah i c.... just for my information which ones were open?
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Old 01-15-2006, 11:42 PM   #30
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only real way to check is to crack it open. but some Gs were closed, and Ks were open, but had 2 more supports at the top of the cylinder, which is why its sometimes refered to "semi closed" and ej207's are also "semi" while 205s are open.
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Old 01-15-2006, 11:56 PM   #31
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Quote:
Originally Posted by scobaru
ah i c.... just for my information which ones were open?
As swapstar noted some EJ20G's after 95 (before 95 they were all closed, after certain ones were still closed), EJ20H's, EJ20K's, EJ20R's, EJ205's, and EJ206's. I dunno about the EJ208's though.

Quote:
Originally Posted by Hurley 2.5 WRS
only real way to check is to crack it open. but some Gs were closed, and Ks were open, but had 2 more supports at the top of the cylinder, which is why its sometimes refered to "semi closed" and ej207's are also "semi" while 205s are open.
Can you explain the supports more indepth?
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Old 01-16-2006, 01:02 AM   #32
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supports.

all NA blocks have tabs at the 2 longitunital ends, the semi-closed has a little tab on the horizontal bits as well. hmm. pictures..... sombody post.

logically the semi-closed is the most idea for cooling/ strength, but honestly, its only 2 cylinders (vs 4 for non boxer engine).

a NA motor isnt any differnt from an open deck turbo block(unless it has oil squirters).

neh.

this is a semi-closed deck block.

up and down tabs X4 (2 top, 2 bottom. NA only has left and right.

Last edited by swapstar; 01-16-2006 at 01:14 AM.
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Old 01-16-2006, 10:43 AM   #33
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what does the closed version look like? -keith
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Old 01-16-2006, 10:53 AM   #34
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closed deck sti-RA.

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Old 01-16-2006, 05:20 PM   #35
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looks bitchin strong! how much more power would one hold compared to a similarly modded semi closed block? abouts? -keith
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Old 01-16-2006, 06:02 PM   #36
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I understand about the open, semi, and closed, but I was wondering about what hurley was saying. Is the EJ20K actually semi-closed? I didn't think there were any phase I engines that were semi-closed.
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Old 01-16-2006, 06:15 PM   #37
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neh. no point. you will break pistons and such before you walk the deck or crack it. perhaps talk to someone at axis or a machine shop that has actualy played with the OG blocks, the hype surrounding it seems to me just a myth somties
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Old 01-16-2006, 07:14 PM   #38
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I agree. The open/closed/semi issue is way over-hyped. The closed deck was a left over idea from the EA engines. After the open deck EJ engines were made a lot of improvements were made, cooling being a big one. And like you said you'll break many other parts of the engine before you damage the block, be it open, closed, or semi. It also depends on the power you are searching for.
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Old 01-16-2006, 07:53 PM   #39
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I will concur with one caveat. When you widen the bore up to the point that you are dealing with 2.5l, there is a strength advantage do a semi-closed deck block. Many guys who have dropped the CR on an EJ251 have had their cylinder bores ovalize under serious boost. 12-14psi seems to be about the safe limit. Beyond that, all bets are off...
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Old 01-17-2006, 05:42 PM   #40
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so why do crawford and others build 2.8's and the like. if they are less reliable, why not use a better sleeve in a 2.2-2.5 to get the same power? just wondered! -keith
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Old 01-17-2006, 10:15 PM   #41
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I don't think anyone said they are less reliable. Just that the different deck deal is overrated. Look at the target power with a 2.8, much more than you could hope for out of a stock engine.
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Old 01-18-2006, 12:31 AM   #42
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and they are resleved with very strong sleeves
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Old 01-18-2006, 01:09 AM   #43
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really with that motor I would worry more of how long can the drivetrain handle 300 whp?...well the torque that accompanies it
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Old 06-29-2012, 02:34 AM   #44
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I know this has nothing to do with the subject but yeah.
Can you use a v4 sti block with the heads off a twin turbo ej206 legacy as my bottom end has gone

Please Get Back
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