Welcome to Ultimate Subaru Message Board, my lurker friend!
|Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.
We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
* The joy of participation and being generally awesome constitutes winning
** Not an actual guarantee, but seriously, you probably won't regret it!
Serving the Subaru Community since May 18th, 1998!
Hybrid 2.2 turbo ?
Posted 09 November 2003 - 03:57 PM
Posted 09 November 2003 - 04:41 PM
Posted 09 November 2003 - 06:28 PM
Posted 09 November 2003 - 06:47 PM
However, that does not mean you cannot interchange their heads. In fact a guy has made a complete monster out of a stock EJ22T block by bolting DOHC EJ25 heads to it. That lowered his CR to about 7.5:1, allowing him to up the boost to about 22-25 lbs, and then the DOHC setup allowed him to reach 8000 rpm... And on the Legacy forums, a guy is sorting out the EJ20-heads-on-EJ22T issue as we speak...
Posted 09 November 2003 - 07:15 PM
Posted 09 November 2003 - 09:41 PM
However the reverse is true also. 2.2 heads on a 2.5 will give a very high comp ratio n/a motor, so much that you'll need to run premium.
Posted 10 November 2003 - 06:00 AM
Posted 10 November 2003 - 06:21 AM
Originally posted by CROSSTBOLT
Please define "open" and "closed" deck. Remember, put it in terms a four year old can understand!
Closed deck blocks are closed where the heads are attached, with small coolant passages around the cylinder bore.
Open deck blocks are totally open with enormous coolant passages where the heads are attached.
Closed deck blocks are more expensive to manufacture because they must be sand cast.
Basically a foam model of the desired part is made, and then the openings are filled with sand. Molten aluminum is poured into the mold which melts and replaces the foam. After cooling the sand is blown out. Extensive machining is then required to bring the block within tolerences.
Open deck blocks are "open" and thus can be die cast. Die casting involves injecting molten metal into a splitable mould. When the metal cools, the mould is split and the part is removed. Only minor finish work is required on the cast part.
Closed deck block engines are stronger than open deck blocks.
See this link for more information and photoshttp://www.legacycen...ibrary/deck.htm
Posted 10 November 2003 - 09:49 AM
Originally posted by Dr. RX
Actually the 2.5 is not simply a bore and stroked 2.2. If memory serves me correctly, one is a closed deck short block and the other is an open deck short block, and therefore the heads would be different. I believe this change came about in 1997, and all the EJ22Ts were build before that. I have an EJ22T and an EJ20G (Turbo engine) that I'm going to try to see if there head swap will work on, both are about the same age, one is a 93 the other is a 92. I have no need for the engine at the moment, so it is not something I'm going to be building soon.
The EJ22T is closed deck and the EJ20G is closed deck, however the EJ22 n/a is open deck and went into production in 1989 IIRC. I think what subyluvr was saying is that the EJ25 is basically a bored and stroked EJ22 which is true. Subaru stopped making a closed deck 2.2 in 94. IIRC the EJ20G lasted a bit longer in the V1 and V2 sti. That may be the engine you're thinking was stopped in 1997? Aren't the new gen Subaru turbo engines, EJ20T and the sti 2.5T (can't remember the engine code), semi closed deck?
Posted 10 November 2003 - 09:25 PM
Posted 10 November 2003 - 10:44 PM
Originally posted by Legacy777
2.5T is the only semi-closed deck block.
Posted 11 November 2003 - 08:40 AM
Originally posted by meatball
So what is the best hybrid motor setup? The 2.5 rs heads on the impreza are a SOHC, but if i am not mistaken the heads on the 2.5 Legacy are DOHC. So when creating a hybrid turbo motor which bottom end and heads will be more benefitial for higher boost?
All depends on how you're building the motor. The only real difference a DOHC setup will give you is the "possibility" of a higher revving engine. But assuming you set everything else up correctly, you probably aren't going to see much gains from an extra 1000 rpm.
0 user(s) are reading this topic
0 members, 0 guests, 0 anonymous users