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12-11-2009, 01:34 AM | #1 |
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EJ22T with Thin Headgaskets
I am currently running a Stock EJ22t Block with EJ25d DOHC Heads and stock ej22t gaskets. I have had it for about 4 years. I was wondering who has run thinner gaskets. I would like to increase my comp ratio a little. I dont think I would risk it with forged pistons, but with the stock cast...are phase II ej22 too thin?
Who has done it?
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12-11-2009, 01:41 AM | #2 |
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Yes, too thin as the stock pistons protrude the deck, will cause pistons to contact the head when engine is cold (= not good).
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12-11-2009, 02:40 AM | #3 |
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Fuji and some others have actually used the 97-99 DOHC gaskets (i.e. Same thickness as the WRX/STI gaskets) and have not changed out to the thicker EJ22T gaskets. They've run on the thinner gaskets and stock pistons for a lot of hard driven miles. I know Fuji has the USDM WRX heads, but can almost swear others have used the DOHC heads with this thin gasket and no issues at all.
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12-11-2009, 03:53 AM | #4 |
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You are right, I stand corrected. I have experience with EJ20G blocks with thin gaskets which have the clearance problem. But I just looked up the respective piston compression heights ( I measured them with calipers back then so they could be a little off):
EJ22T 33.2 mm EJ20G/H 33.5 mm It seems those 0.3 mm just make the difference. |
12-11-2009, 01:44 PM | #5 | |
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Quote:
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12-11-2009, 06:40 PM | #6 |
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Not necessarily. Here is a compression calculator that uses gasket bore size as a parameter for calculating final compression.
http://www.csgnetwork.com/compcalc.html The wiseco compression specs are calculated using 2.5L headgaskets. I used 2.5L gaskets on my build and several others have on their EJ22T's as well. Good Luck |
12-11-2009, 07:32 PM | #7 |
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THINNEST are 99-01 EJ22E; do NOT use these.
Thinner HG are the 97-98 EJ22E. These are the same 3layer as the WRX/STi but with 2.2L bore. They are ENOUGH to clear the piston-to-head. Yes I've ran them with NO problems with my EJ22T shortblock on my '02/03 WRX swap. I will STILL be running them on my '06 WRX swap. However the EJ22T is being BUILT with the custom CP pistons having the WRX EJ205 compression height to give me better quench clearance. |
12-11-2009, 08:23 PM | #8 |
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What does the comp ratio turn out to be with these?
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12-11-2009, 11:21 PM | #9 |
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12-12-2009, 01:40 AM | #10 |
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12-12-2009, 09:05 AM | #11 |
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the one in the pic is the 97-98. it has the same coolant passage pattern as early wrx/sti; excluding usdm '06+ wrx & usdm '07+ sti/fxt/lgt.
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06-10-2010, 12:00 PM | #12 | |
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Old thread but to save someone the trouble I just went thru.....the part number for the older HG is 11044AA114, NOT the one in the picture.
The HG for the Phase 1 ('90-98): 11044AA114 "Engine - Cylinder head & valves - Head gasket Head gasket, legacy - 1.8l, 2.0l, 2.2l 1995 - 1998" and "Engine - Cylinder head & valves - Head gasket Head gasket, legacy, w/o turbo - 2.2l, legacy 1990 - 1994" Here's what the 11044AA114 (EJ22E Phase 1) looks like on the EJ22T: The one in the pic above 11044aa542 (still in the plastic) for the Phase 2 EJ22 is the modded one used here: EJ22 Phase 2: 11044aa542 "Engine - Cylinder head & valves - Head gasket Head gasket, impreza, 2.2l - 1.8l, 2.0l, 2.2l 1999 - 2001" You can check the upper left hole. On my EJ22T it's covering the top of the hole; on the pic of the modded HG it's covering the lower part - not the same HG. MAKE SURE IT'S THE Latest/Current 3-LAYER Head Gasket. Early ones (same part number-11044aa542) were SINGLE LAYER - DO NOT USE - as some dealers may still have old stock on the shelves. Per Fuji to modify the HG: Quote:
Head Gasket info as of 7/14/11: 1990-'98 (Phase 1) EJ22E----------11044AA114 99-'00 (Phase 2) EJ22?-----------11044AA542 1996-'98 (Phase 1) EJ25D*-------11044AA610 1999-'08 (Phase 2) EJ251/EJ253--11044AA633 02 ej205------------------------11044AA483 '91-'94 (Phase 1) EJ22T --------11044AA282 * The '99 Legacy Outback/GT still had the DOHC heads, but the block is reported to be a Phase 2, EJ253, so HG is probably the newer style 11044AA633. Thanks to Fuji K for clarifying! Last edited by wtdash; 10-24-2013 at 03:58 PM. |
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06-10-2010, 12:16 PM | #13 |
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^^^ The HG you have that's blocking the coolant passages are the phase 1 EJ22E NA. The EJ22T HG is different and matches up to the EJ22T block passages.
Just so you know the 11044AA542 HG is a 3layer HG. Same thickness as the WRX/STi EJ205/EJ257/EJ255. I ran them with my STOCK EJ22T shortblock on WRX EJ205 heads. |
12-29-2012, 02:11 PM | #14 |
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It's still somewhat confusing. So it seems the 11044AA542 is to be used for an EJ22T block with the old style heads (B25 etc). And this 11044AA542 needs to be ported out to match the EJ22T block passages?
What about using the newer D25 and V25 heads with EJ22T block? What part number works well there? |
12-29-2012, 03:23 PM | #15 |
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its still the 11044AA542
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12-29-2012, 06:15 PM | #16 |
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I was blowing coolant with my 20G setup on boost. I wasn't sure if it had to do with the gaskets being modded too large of a hole on the bottom between the oem openings, or was it due to my car overheating several times because i had no fans, or was it because i torques the FACTORY head bolts to 85-95ft lbs vs sequence with 90° stuff or a combination of these variables. I looked over the HG and it was leaking through all exhausts. It should only push coolant with higher boost. Run lower boost and it won't push. A single pull would be fine but if you ran it hard on and off boost like race track style, it'll push coolant out. Drives normal around town.
So my next test with the rebuild is to drill smaller holes. Kind of & kind of don't want to try the D25 HG; 100mm bore. |
12-29-2012, 06:58 PM | #17 |
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12-30-2012, 12:00 AM | #18 |
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Fuji I ran an unmodified 11044AA770 using EJ22T block and D25 heads for a year. Held boost just fine up to 30psi, but would overheat more than is the norm. This time I will get the 11044AA542 to place side by side with the 11044AA770 to compare coolant passages, in the hopes of having a eureka moment.
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