|
|
|
|
Thread Tools | Display Modes |
02-06-2007, 12:47 PM | #1 |
Scooby Specialist
Member#: 39092
Join Date: Jun 2003
Chapter/Region:
MWSOC
Location: St. Louis MO
Vehicle:2004 WRX STi Java Black Pearl |
Open vs Closed vs Semi-Closed decks
Can someone explain to me the pros and cons of each setup? What exactly do these terms mean? I tried doing a quick google search and didn't find much. All I know is that the Mitsubishi 4G63 is a closed deck and our Subaru EJXXX engines are semi-closed decks.
* Registered users of the site do not see these ads.
|
02-06-2007, 01:07 PM | #2 |
Scooby Newbie
Member#: 107048
Join Date: Feb 2006
Location: SoCal
Vehicle:07 Civic Si Sedan GG |
http://legacycentral.org/library/literature/deck.htm
EDIT: CLosed deck generally means the blocks will withstand more; thats not to say that a subie block can't hold a lot of boost/heat, but the 4G63 with its iron block does used a closed design as its cheaper (tends to hold more power/boost, though internals of course have an effect as well). |
02-06-2007, 01:16 PM | #3 | |
Scooby Specialist
Member#: 39092
Join Date: Jun 2003
Chapter/Region:
MWSOC
Location: St. Louis MO
Vehicle:2004 WRX STi Java Black Pearl |
Quote:
|
|
02-06-2007, 01:18 PM | #4 |
Scooby Specialist
Member#: 49978
Join Date: Dec 2003
Chapter/Region:
NESIC
Location: Shrewsbury, MA
Vehicle:2002 WRX w/ JDM STi 6spd, EJ255, VF39 & EWG |
Not all Subaru EJ engines are semi-closed.
I only know the turbo motors so here they are: EJ205 - 2.0L USDM WRX, open deck, 2002-2005 models - 8.0:1 CR EJ207 - 2.0L JDM STi, semi-closed - 9.0:1 CR EJ22T - 2.2L USDM early-mid 1990's Legacy, closed deck - unsure EJ255 - 2.5L USDM Baja Turbo, Legacy GT, 2006+ WRX, semi-closed - 8.4:1 CR EJ257 - 2.5L USDM STi, semi-closed - 8.5:1 CR There is also a JDM WRX motor but I am unsure of what the specs are. I believe it is 9.0:1 CR motor that is also open deck. Someone correct me if anything I posted is wrong. |
02-06-2007, 01:18 PM | #5 |
Scooby Newbie
Member#: 107048
Join Date: Feb 2006
Location: SoCal
Vehicle:07 Civic Si Sedan GG |
ya
http://www.techworkseng.com/images/p...rt%20Block.JPG You can see on the STi block how its not open all the way around the cylinder walls |
02-06-2007, 01:19 PM | #6 | |
Scooby Guru
Member#: 50221
Join Date: Dec 2003
Chapter/Region:
MWSOC
Location: Near water
Vehicle:I'm on internets Racin on ur bandwidth! |
Quote:
Open deck has the most "space" for coolant to pass through... closed has the least. Semi-closed is somewhere inbetween the two. Closed decks are known to be troublesome in the cooling department. |
|
02-06-2007, 01:22 PM | #7 | |
Scooby Newbie
Member#: 107048
Join Date: Feb 2006
Location: SoCal
Vehicle:07 Civic Si Sedan GG |
Quote:
|
|
02-06-2007, 01:26 PM | #8 |
Scooby Specialist
Member#: 90879
Join Date: Jul 2005
Chapter/Region:
TXIC
Location: Houston, Texas
|
[img]http://www.cgperformance.com/images/cg***37;20closed%20deck%20block%20LWP.jpg[/img]
Closed deck: Semi-closed deck: Open deck: |
02-06-2007, 01:28 PM | #9 |
Scooby Guru
Member#: 50221
Join Date: Dec 2003
Chapter/Region:
MWSOC
Location: Near water
Vehicle:I'm on internets Racin on ur bandwidth! |
Good pics.
|
02-06-2007, 01:47 PM | #10 |
Scooby Specialist
Member#: 39092
Join Date: Jun 2003
Chapter/Region:
MWSOC
Location: St. Louis MO
Vehicle:2004 WRX STi Java Black Pearl |
Thanks for all the links! So pretty much a closed deck is the best of both worlds?
|
02-06-2007, 02:58 PM | #11 |
Scooby Specialist
Member#: 123574
Join Date: Aug 2006
Vehicle:2005 STi CGM |
|
02-06-2007, 04:30 PM | #12 |
Scooby Newbie
Member#: 121757
Join Date: Aug 2006
Location: Edmonton, Alberta
Vehicle:2005 Subaru Forester White |
I've never heard of cooling issues with closed deck engine. Open decks allow for more consistent temps and better control which helps emissions, but most of the rock solid reliable engines of the past are closed deck.
|
02-06-2007, 04:52 PM | #13 | |
Scooby Guru
Member#: 22825
Join Date: Aug 2002
Chapter/Region:
NWIC
Location: Seattle, WA
|
Quote:
If a race shop takes an open deck block, and adds material to make it a closed deck, that is where most of the complaints of poor cooling come from. Or if they add supports to make it semi-closed, they run the risk of material expanding at different rates. This is usually because of the poor design and inadequate testing done to see where coolant jackets need to be, and at what size. Builders are just using a rough guess, or assuming, based on their experience. A factory built block (semi or closed) will be the best choice and will work with little to no issue. Manufacturers spend millions in research for a single engine to design and test. Why should you try to better them? |
|
02-06-2007, 04:59 PM | #14 | |
Scooby Guru
Member#: 50221
Join Date: Dec 2003
Chapter/Region:
MWSOC
Location: Near water
Vehicle:I'm on internets Racin on ur bandwidth! |
Quote:
More Surface Area for coolant to contact will yield less temperature problems. |
|
02-07-2007, 12:01 AM | #15 |
Scooby Specialist
Member#: 39092
Join Date: Jun 2003
Chapter/Region:
MWSOC
Location: St. Louis MO
Vehicle:2004 WRX STi Java Black Pearl |
Are most modern engine semi-closed decks like subaru now?
|
05-15-2013, 01:19 PM | #16 |
Scooby Newbie
Member#: 262260
Join Date: Oct 2010
Location: NJ
|
this is why evo can run more boost
|
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Open deck/ semi-closed deck/ closed deck in the STi? | scoobybrande | News & Rumors | 11 | 10-23-2008 11:32 AM |
open deck, semi-closed deck, closed deck | jdiddy | Newbies & FAQs | 9 | 02-25-2006 12:25 PM |
Open vs. Semi-Closed vs. Closed Decks... | BLK REX | Off-Topic | 34 | 02-08-2006 04:50 AM |
what cars eqpt. w/ closed or semi closed deck | zakats | Normally Aspirated with bolt-on Forced Induction Powertrain | 5 | 11-20-2003 10:39 AM |
What is the difference between closed deck, open deck, semi-closed deck? | disc108 | Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) | 2 | 01-07-2002 08:23 AM |