Semi\Closed Deck STi block?

hyp36rmax · 03-06-2004, 11:14 AM

I was curious, i have a 2004 Impreza WRX, would i need a retune just to have a semi-closed or closed deck block? i know with a semi or closed, i can retain boost more efficiently, sure tuning is always good, but is it needed for something like this?

another thing what else is needed in the process? stronger pistons? Rods, shafts? haha i dunno, im new to engine stuff, and yes i did search, but i couldnt find specific awnsers....

oh whats the difference btwn the short block and long block? how will changing either effect emmisions? would i still be able to pass if im running with factory cats?

just a curious one....

thanks,
eiji

* Registered users of the site do not see these ads.

XT6Wagon · 03-06-2004, 01:07 PM

Honestly a closed or semi-closed deck block only adds wieght until after the 300WHP mark. Afterthat you will have a wide variety of numbers thrown at you for the "real" spot where you "need" the stronger block.

I say don't worry about it till you have already smashed that motor to chunks since replacing a broken motor is the same as building one up properly in a new block

WRX34 · 03-06-2004, 03:31 PM

Quote:

Originally posted by XT6Wagon
I say don't worry about it till you have already smashed that motor to chunks since replacing a broken motor is the same as building one up properly in a new block

>???? How does it cost the same? And how IS it the same?

Lil confused on that note. I'd rather build up my EJ20 now before it blows but that's just my stupid opinion.

WRX34

Scary Gary · 03-06-2004, 03:34 PM

I'm not seeing how blowing up a motor and starting from scratch is the same price.

I know from experience that blowing up a motor (although fun) will cost you more in the long run.

If you have a good starting point, which I believe the EJ20 is there is no point in blowing it up and starting new.

Gary

Enigma76 · 03-06-2004, 04:15 PM

what kind of power are you trying to run? the stock ej205 is supposedly alright for up to like 350+ whp. maybe some of the more knowledgeable guys can chime in, but unless your running some serious power or feel like really upping the boost/displacement, theres no real need to start screwing with internals.

dandbest · 03-06-2004, 04:54 PM

What XT6 is trying to say is that for you to upgrade the pistons/rods/ and to close or semi close the deck will not cost you anymore now, or when you blow the motor. In other words, you will STILL need to hone the cylinders, blown or not, its the same ammount of work either way. So, have fun with your current engine, until you get to the power level (300+ wheel horse power) where the stock engine lets go, and go from there. Get it?

Danny
PS- hyp36rmax--if you are new to "engine stuff" as you put it, maybe you shouldnt be touching the car?

WRX34 · 03-06-2004, 07:37 PM

A blown motor? We're not talking a small comp leak or headgasket....BLOWN..as in: Hi look over here, I can see my crank!

You plan on JB welding it? LOL Not smart but sure it'll work I suppose hahaha. I plan on doing internals n **** before actually "blowing" it up. Cuz THEN you'll need to grab a whole new shortblock. Regardless of honing and doing the rest.

WRX34

hyp36rmax · 03-06-2004, 07:38 PM

Quote:

Originally posted by dandbest

PS- hyp36rmax--if you are new to "engine stuff" as you put it, maybe you shouldnt be touching the car?

LOL, not that new guys!

i know my way around, i was just curious, to be knowledgable in taht manner. i actually experienced first hand how some modified ej20's work, hehe i also seen stealth-wrx's car in person, (great guy! and very knowledgable)

what im really trying to get at is to get a good idea of the basis of all this is, even though none of my questions were awnered

of course going a 2.0 route is good, but going 2.5 is always better, "no replacement for displacement" chimes in rite here in fact. but i want to know the general info, of course semi\closed decks can retain more boost at a higher heat rate? less prone to being blown then our EJ205.

Quote:

oh whats the difference btwn the short block and long block? how will changing either effect emmisions? would i still be able to pass if im running with factory cats?

please school me here

WRX34 · 03-06-2004, 07:45 PM

Well look at this for a second. I know it's not the best to "scientifically" understand which you can build up or handle more power but yeah:

EJ20:

Quote:

Recommended up to 550HP and up to 25psi of boost pressure in street use.

Our Short Blocks consist of a carefully chosen set of components engineered to be used together. Our 2.0L EJ20 Short Block features:

EJ20 WRX High-Pressure Die Cast Short Block (2.0L Displacement)
Cast-Iron Cylinder Liners
Strong Billet 4340 Steel Connecting Rods
Custom 92.5mm Turbo Forged Aluminum Pistons (8.0:1 CR)
Heavy-Duty Chromoly Piston Pins
Anti-Friction Piston Skirt Coating
Ceramic Piston Crown Coating
Turbo Specific Piston Rings
Prepared Forged Chromoly Crankshaft (75mm Stroke)
Wire-Ringed Cylinder Deck
Computerized Balance of rotating assembly
8000 RPM Recommended Rev Limit

EJ25:

Quote:

Recommended up to 550HP and up to 25psi of boost pressure in street use.

Our 2.5L Turbo Short Block features:

EJ25 Phase II High Pressure Die Cast Short Block (2.5L Displacement)
Strong Billet 4340 Steel Connecting Rods
Custom 100mm Turbo Forged Aluminum Pistons (8.5:1 CR)
Heavy-Duty Chromoly Piston Pins
Anti-Friction Piston Skirt Coating
Ceramic Piston Crown Coating
Turbo Specific Piston Rings
Modified Forged Chromoly Crankshaft (79mm Stroke)
Fully-Closed Deck modification
Wire-Ringed Cylinder Deck
Computerized Balance of rotating assembly
Specially Machined Block w/ improved oil and water passages

http://cobbtuning.com/wrx/engine-ass...iginal.html#20

Seems to be similar...it all comes down to how much you REALLY wanna spend I guess!

WRX34

WRX34 · 03-06-2004, 07:47 PM

Longblock= Everything but tranny...includes heads.

Shortblock= Everything but the head...basically JUST the block (pistons, rods, n crank)

WRX34

dandbest · 03-06-2004, 08:04 PM

Quote:

Originally posted by WRX34
Longblock= Everything but tranny...includes heads.

Shortblock= Everything but the head...basically JUST the block (pistons, rods, n crank)

WRX34

Actually a Longblock doesnt include things like intake manifold/injectors/throttle body and everything attached to the engine such as alternator, power steering pump etc.

hyp36rmax · 03-06-2004, 08:08 PM

hehe yes ive been contemplaiting cobbs advancment at least in advertising what they have, it was quite an awesome surprise of an update on there website, to see that.

so what about having a semiclosed or closed deck would a retune be neccessary (always a good idea i know, (devils advocate?)) and will emmisions be a problem with factory cats in place?

03-06-2004, 11:14 AM	#1
hyp36rmax Scooby Specialist Member#: 24537 Join Date: Sep 2002 Chapter/Region: SCIC Location: sfVoltron, RI, Motormonkeys Vehicle: 2006 LanEVO9 RS SFVoltron White	Semi\Closed Deck STi block? I was curious, i have a 2004 Impreza WRX, would i need a retune just to have a semi-closed or closed deck block? i know with a semi or closed, i can retain boost more efficiently, sure tuning is always good, but is it needed for something like this? another thing what else is needed in the process? stronger pistons? Rods, shafts? haha i dunno, im new to engine stuff, and yes i did search, but i couldnt find specific awnsers.... oh whats the difference btwn the short block and long block? how will changing either effect emmisions? would i still be able to pass if im running with factory cats? just a curious one.... thanks, eiji * Registered users of the site do not see these ads.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
GF8 STI block of the engine	Mirone	Car Care & Detailing	2	06-02-2010 08:35 AM
FS Sti Block clean/rehone/mill deck..and more	roccrew585	Engine/Power/Exhaust	15	07-14-2009 12:28 AM
2.2 closed deck short block	willimprez	Engine/Power/Exhaust	1	03-06-2007 10:29 PM
EJ22T closed deck long block for sale IA	bheinen74	Private Vehicle 'For Sale' Classifieds	3	01-10-2007 10:13 AM
Evilly plotting a semiclosed 2.5L block for my WRX	crazyhorse	South East Region Forum	6	02-12-2003 09:22 PM

03-06-2004, 01:07 PM	#2
XT6Wagon Scooby Specialist Member#: 524 Join Date: Nov 1999 Location: WA Vehicle: 04 STi White	Honestly a closed or semi-closed deck block only adds wieght until after the 300WHP mark. Afterthat you will have a wide variety of numbers thrown at you for the "real" spot where you "need" the stronger block. I say don't worry about it till you have already smashed that motor to chunks since replacing a broken motor is the same as building one up properly in a new block

03-06-2004, 03:34 PM	#4
Scary Gary Scooby Newbie Member#: 43665 Join Date: Sep 2003 Location: "IROC" Vehicle: 1997 honda hummer blown red rocket	I'm not seeing how blowing up a motor and starting from scratch is the same price. I know from experience that blowing up a motor (although fun) will cost you more in the long run. If you have a good starting point, which I believe the EJ20 is there is no point in blowing it up and starting new. Gary

03-06-2004, 04:15 PM	#5
Enigma76 Scooby Newbie Member#: 37247 Join Date: May 2003 Location: Cranston, RI Vehicle: 2004 WRX Platinum Silver	what kind of power are you trying to run? the stock ej205 is supposedly alright for up to like 350+ whp. maybe some of the more knowledgeable guys can chime in, but unless your running some serious power or feel like really upping the boost/displacement, theres no real need to start screwing with internals.

03-06-2004, 04:54 PM	#6
dandbest Scooby Specialist Member#: 1885 Join Date: Jul 2000 Chapter/Region: Tri-State Location: Long Island, NY Vehicle: 2024 RS3 Kemora Gray	What XT6 is trying to say is that for you to upgrade the pistons/rods/ and to close or semi close the deck will not cost you anymore now, or when you blow the motor. In other words, you will STILL need to hone the cylinders, blown or not, its the same ammount of work either way. So, have fun with your current engine, until you get to the power level (300+ wheel horse power) where the stock engine lets go, and go from there. Get it? Danny PS- hyp36rmax--if you are new to "engine stuff" as you put it, maybe you shouldnt be touching the car?

03-06-2004, 07:37 PM	#7
WRX34 Scooby Specialist Member#: 13364 Join Date: Dec 2001 Chapter/Region: MWSOC Location: MI Vehicle: 1996 GM8 caged, 99 V8 RSTi, 11' FXT	A blown motor? We're not talking a small comp leak or headgasket....BLOWN..as in: Hi look over here, I can see my crank! You plan on JB welding it? LOL Not smart but sure it'll work I suppose hahaha. I plan on doing internals n **** before actually "blowing" it up. Cuz THEN you'll need to grab a whole new shortblock. Regardless of honing and doing the rest. WRX34

03-06-2004, 07:47 PM	#10
WRX34 Scooby Specialist Member#: 13364 Join Date: Dec 2001 Chapter/Region: MWSOC Location: MI Vehicle: 1996 GM8 caged, 99 V8 RSTi, 11' FXT	Longblock= Everything but tranny...includes heads. Shortblock= Everything but the head...basically JUST the block (pistons, rods, n crank) WRX34

03-06-2004, 08:08 PM	#12
hyp36rmax Scooby Specialist Member#: 24537 Join Date: Sep 2002 Chapter/Region: SCIC Location: sfVoltron, RI, Motormonkeys Vehicle: 2006 LanEVO9 RS SFVoltron White	hehe yes ive been contemplaiting cobbs advancment at least in advertising what they have, it was quite an awesome surprise of an update on there website, to see that. so what about having a semiclosed or closed deck would a retune be neccessary (always a good idea i know, (devils advocate?)) and will emmisions be a problem with factory cats in place?