Why is the USDM EJ20 an open-deck block?
11-24-2003, 11:39 PM
#1
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Why is the USDM EJ20 an open-deck block?
If japan has always had closed-deck EJ20 engines on their WRX's, why is it that the USDM has to get a redesigned open-deck EJ20? As far as I know closed-deck engines are always supposed to be more reliable with a forced induction setup.
Did the japanese-spec engines have some sort of gasket problems or something? Is it just for better cooling?
Are the new-generation WRX's in japan still sporting a Closed-Deck Block, or is it similar to what we have now in the US?
I just read another topic on the STi's semi-closed deck design and these questions popped in my mind.
Any insight will be appreciated.
Dan
Did the japanese-spec engines have some sort of gasket problems or something? Is it just for better cooling?
Are the new-generation WRX's in japan still sporting a Closed-Deck Block, or is it similar to what we have now in the US?
I just read another topic on the STi's semi-closed deck design and these questions popped in my mind.
Any insight will be appreciated.
Dan
11-25-2003, 12:33 AM
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caterpill,
you are right closed-deck engines are always more reliable with high level forced induction setup (25psi or more)... with the right engine managment... example the by far best subie / Impreza 22B....there is no problems with closed deck gaskets in japanese motors or the us... the only reason they make thenm is its easy to get the casting apart when they are making the blocks.. and it makes for a little cooler top area around the fire ring.... that burns off the gas for a little better smog control.... the new STI is open deck and all the new Subarus are open deck......
R.S. Machine in Torrance, California "Mike Coughtrie" is pioneering the cut step deck on subies..... to create more clamping force... in turn it will hold the high boost level... also copper gaskets have been know and tested in top fuel to over 5000 HP....
you are right closed-deck engines are always more reliable with high level forced induction setup (25psi or more)... with the right engine managment... example the by far best subie / Impreza 22B....there is no problems with closed deck gaskets in japanese motors or the us... the only reason they make thenm is its easy to get the casting apart when they are making the blocks.. and it makes for a little cooler top area around the fire ring.... that burns off the gas for a little better smog control.... the new STI is open deck and all the new Subarus are open deck......
R.S. Machine in Torrance, California "Mike Coughtrie" is pioneering the cut step deck on subies..... to create more clamping force... in turn it will hold the high boost level... also copper gaskets have been know and tested in top fuel to over 5000 HP....
Last edited by suberacer; 11-25-2003 at 02:26 AM.
11-25-2003, 12:36 AM
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Follow this link. All you need to know is right here
http://www.spdusa.com/new_page_4.htm
Newer JDM WRXs have the same ej205 we have, with little tweaks like higher compression and AVCS. It isn't only the USDM GD WRX that has been stuck with this engine.
http://www.spdusa.com/new_page_4.htm
Newer JDM WRXs have the same ej205 we have, with little tweaks like higher compression and AVCS. It isn't only the USDM GD WRX that has been stuck with this engine.
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