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Old 06-09-2003, 10:00 PM   #1
Hondaslayer
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Default Bad news

The STi block is only semi closed deck (more like lightly reinforced) It is not like the old legacy trubo blocks of yore,However,the pistons will drop right in!
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Old 06-09-2003, 10:39 PM   #2
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weren't they all semi closed decks?
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Old 06-09-2003, 11:17 PM   #3
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Isnt that what it was supossed to be?
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Old 06-09-2003, 11:38 PM   #4
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Yes,But I' just dissapointed B/C they refer to the legacy as semi closed deck(which it is)whereas this is closer to a reinforced deck.
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Old 06-10-2003, 12:34 AM   #5
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jeremy, i may have missed it, but what i really want to know is if both the pistons AND heads are direct swaps? could we just add STi heads and some management and have AVCS?

i'm only half knowlegeable in engine tuning - help me overcome this
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Old 06-10-2003, 12:51 PM   #6
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I always thought the EJ22T was closed deck? The same goes with some of the 95&under Impreza Ls' that had a 2.2
Anyways,
If the STi block is only rienforced I'd still take it.
Maybe they did it that way to keep the enigne temps down. I know if they semi or closed that deck it would run hotter.

Does anybody have pics of the STi deck??
wighti,
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Old 06-10-2003, 01:00 PM   #7
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Quote:
Originally posted by bjlee
jeremy, i may have missed it, but what i really want to know is if both the pistons AND heads are direct swaps? could we just add STi heads and some management and have AVCS?

i'm only half knowlegeable in engine tuning - help me overcome this
that's not me that's ben

and it was widely known the block was not closed deck it's a reinforced deck which is all you need, closed decks are very over rated and also cause massive heating issues in the heads and the top end of the cylinder. the block is a direct swap, the heads are not, the heads require quite a bit of work to get to fit and operate, you might as well just do a total STi RA swap at that point and you will need a WRX wiring harness.

Jeremy
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Old 06-10-2003, 01:04 PM   #8
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I only want the block, pistons, crank and rods anyways so I can keep my orignal wiring harness, Borla header and T3/T4 turbo kit. Which is why I'm only after the motor from a wrecked turbo Forester.
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Old 06-10-2003, 01:24 PM   #9
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I was just a bit dissapointed when I saw Still very kewl none the less,And yes I'd still hit it.
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Old 06-10-2003, 02:49 PM   #10
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rhdude mentioned in another thread that nobody knows what the wiring differences are yet or if you can bolt the non-turbo EJ25 heads onto the new turbo motor.
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Old 06-10-2003, 03:22 PM   #11
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Can you please elaborate on this? I never heard that before.

Quote:
Originally posted by HndaTch627


closed decks are very over rated and also cause massive heating issues in the heads and the top end of the cylinder.
Jeremy
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Old 06-10-2003, 03:39 PM   #12
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Its something about the area between the deck and the head having a hard time staying cool with the increase amount of metal and reduced cooling surface.

You can also O ring the underside of the head as a precaution with your open deck block if your really concerned with blowing a headgasket.
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Old 06-10-2003, 05:26 PM   #13
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hmm I thought with the increased metal surface you have more cooling area. Since the coolant runs along the metal to cool it right? The only issue with cooling would be that passages and on the head and the block don't match up, but I never heard any serious problems with it.
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Old 06-10-2003, 05:38 PM   #14
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It would cool better if the coolant came into contact more with the underside of the head instead of the backside of the deck. The deck would also add more metal and less area for the coolant to have contact with the top of the cylinder wall.
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Old 06-10-2003, 05:42 PM   #15
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Ok, i understand the theory bascially the coolant doesn't get to all the places it needs to. How serious could it be though. I've yet to hear of any hybrids with serious cooling issues.
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Old 06-10-2003, 06:21 PM   #16
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Anyone have a part number for the new STi shortblock? I would love to get a price on one of those.
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Old 06-10-2003, 06:29 PM   #17
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Well one of the dealerships in VA probably still has one of the wrecked STI there by now. I've heard that one of them had a wrecked one in already so maybe it would be easier to call around.
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Old 06-11-2003, 02:32 AM   #18
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Quote:
Originally posted by seven881
Ok, i understand the theory bascially the coolant doesn't get to all the places it needs to. How serious could it be though. I've yet to hear of any hybrids with serious cooling issues.
it's funny you say that since #4 is the hottest cylinder coolant wise in the block and that always seems to be the cylinder that lets go even though it's not the leanest cylinder.

the new blocks are lego's like the old blocks, everthing goes together, it's just a matter of hybriding parts together.

jeremy
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Old 06-11-2003, 03:07 AM   #19
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I thought that was an issue with the EJ20 and EJ25's?
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Old 06-11-2003, 08:51 AM   #20
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Ben, what about oil squirters? Find out if we can buy whatever part is needed to outfit a EJ25 with oil squirters. We probably need to buy the higher pressure oil pump too, don't want to sacrifice any oil pressure going to the main bearings.
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Old 06-11-2003, 09:47 AM   #21
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Find out if the crank has the same number of teeth for the timing belt, if the SOHC non-turbo heads bolt up and if it has the same flanges for its exhaust manifold of if they work the same as the WRX ones with the WRX crossmember.
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Old 06-20-2003, 12:39 PM   #22
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Quote:
Originally posted by N/A
I only want the block, pistons, crank and rods anyways so I can keep my orignal wiring harness, Borla header and T3/T4 turbo kit. Which is why I'm only after the motor from a wrecked turbo Forester.
http://www.subaruparts.com/catalog/?section=405

Are sti and forester useing the same semi closed block? and what heads would be ideal.
Ive been thinking either ej22T with sti v7/8 heads(dont know if that will even work) or wrx heads from cobb. or the 2.5 with dont know what.
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