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 Post subject: EJ22T Pistons
PostPosted: Thu Oct 26, 2017 3:19 am 
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Joined: Thu Oct 26, 2017 2:31 am
Posts: 6
Want a cheap alternative piston for the EJ22T without going forged or hopefully be able to find O/S OEM pistons. Well I may have found a solution that I don't think has been done before ( I searched but not that hard).

So a little back story. I got a bunch of parts to do an EJ22T w/ EJ20 heads swap into my 95 Legacy LSI wagon. Right now I'm running all OEM WRX stuff, injectors, turbo, and have got the ECU wired up and working for tuning just to get the thing running. However the block had some minor pitting on the cylinder walls and I (at the time) did not want to pay for new pistons and bore to get it running. So I just honed it till the pitting was gone and put it together and as you probably can guess it started making all sorts of bad noises. I knew I had to get new pistons and there was no way in hell I was going to go forged because I don't have those power goals and I DO NOT want to spend that much (full time engineering student = not that much money). I then decided to do the same thing I have done with the motors I have built with my AE86. Find an OEM part from another manufacture that will fit.

I went through a lot of catalogs and books and came across something that stands a VERY good chance of working. The Buick L67 V6
Specs-
Bore - 96.5mm
Wrist pin - .905 x 2.5 (23mm x 63.5mm)
Compression height - 1.197 - 1.2 (more on this)
Dish - I think -13 cc (More on this)

I'll start with the compression height. This is about 0.1 lower than the OEM EJ22T piston so this means that there will be a big compression drop, however, since the pistons is now down in the hole there is no more fear of making piston to head contact so just run the very thin EJ22E head gasket.

Then the dish of the piston. I'm not entirely too sure yet but there are no consistent numbers on OEM dish size. The numbers that I have seen from after market pistons for the L67 state that at a 1.205 compression height (about 5 thou higher than OEM) they are using -13.3cc's of dish to achieve 8.5 compression w/ OEM head gasket. Since the OEM compression of the L67 is 8.5 and those pistons having 5 thou higher compression height its safe to ASSume they are -13cc's. This will also bring the compression up for the EJ22T.

The other good part about this. The L67 is a supercharged engine so these pistons are designed with boost and LOTS of heat in mind (some manufactures will anodize the piston crown) so they should be able to withstand a good beating. Combing the now mostly dead forums for the L67 most of those guys were breaking rods before the piston gave out but there is the occasional piston crown breaking. Could be bad tune or just bad piston.

I did save the best for last though. These pistons can be had off of Rock Auto for a the small price of $24 a piston and they are offered in a 0.75mm oversize. Bringing the final bore to 97.25mm perfect for a minimal bore and hone.

And to be sure that I'm not just talking to talk. I have put my money where my mouth is and ordered everything. Should be here Friday all I need now is to find a shop to do the machine work needed for a reasonable price and ill start assembling it.


Last edited by LSiTurbo on Thu Oct 26, 2017 5:23 pm, edited 1 time in total.

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 Post subject: Re: EJ22T Pistons
PostPosted: Thu Oct 26, 2017 3:53 am 
Third Gear
Joined: Sat Dec 16, 2006 4:41 am
Posts: 730
Location: Parkville, Mo.
That v6 is a 2 valve motor isn't it. What about valve relief pockets?

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 Post subject: Re: EJ22T Pistons
PostPosted: Thu Oct 26, 2017 3:57 am 
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Joined: Thu Oct 26, 2017 2:31 am
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Yup they are a 2 valve and valve relief pocks are not there. But it has the same style of dish cut as the EJ22t and those have a very minor relief cut. I will assemble the motor and check clearances with some clay will adjust after if needed.

But you do have to keep in mind that with the OEM specs the EJ22 had about 1.3-1.0mm piston to head clearance. These piston will have 3mm piston to head clearance. Valve reliefs may not be needed but like I said I will measure.


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 Post subject: Re: EJ22T Pistons
PostPosted: Thu Oct 26, 2017 1:06 pm 
Fifth Gear
Joined: Fri Jun 20, 2008 8:17 am
Posts: 6233
Location: Lakewood, Wa 98439
This is interesting.

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91 L-TW Wagon with a full Swap -RIP
92 SS Prefaced, GD dash swapped, 22T/205 Hybrid 20 psi - BEAST!
93 SS Bone Stock Gone!
94 TW Bone Stock Gone!
91 SS 4EAT Sold!
98 LGT 4EAT
98 LGT Wagon 4EAT


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 Post subject: Re: EJ22T Pistons
PostPosted: Tue Oct 31, 2017 5:50 am 
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Joined: Thu Mar 02, 2017 5:19 pm
Posts: 7
LSiTurbo wrote:
I'll start with the compression height. This is about 0.1 lower than the OEM EJ22T piston so this means that there will be a big compression drop, however, since the pistons is now down in the hole there is no more fear of making piston to head contact so just run the very thin EJ22E head gasket.


Problem:

You cannot use EJ22E head gaskets with EJ20 heads, assuming you are running DOHC heads. The coolant passages to the head through the head gasket do not match up.


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 Post subject: Re: EJ22T Pistons
PostPosted: Tue Oct 31, 2017 6:14 am 
First Gear
Joined: Mon Feb 20, 2012 5:44 pm
Posts: 203
Location: Salt Lake City, UT
^Good point. I found some pics that may support that here: viewtopic.php?t=42127

I've used OEM EJ25D gaskets on a 22T/205 hybrid and it matched up very well with the coolant passages of the 205 heads and 22T block. Wonder if the OP could use them for this build.

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03 WRX 22T/205 20GXT 350 whp
95 BK - Sold to my neighbor.


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 Post subject: Re: EJ22T Pistons
PostPosted: Tue Oct 31, 2017 6:46 am 
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Joined: Thu Mar 02, 2017 5:19 pm
Posts: 7
monkeyposeur wrote:
^Good point. I found some pics that may support that here: viewtopic.php?t=42127

I've used OEM EJ25D gaskets on a 22T/205 hybrid and it matched up very well with the coolant passages of the 205 heads and 22T block. Wonder if the OP could use them for this build.


EJ22T head gaskets are his best bet, or going custom to bring the thickness down to exactly 1mm.


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 Post subject: Re: EJ22T Pistons
PostPosted: Wed Nov 01, 2017 3:32 am 
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Joined: Thu Oct 26, 2017 2:31 am
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Umm yes the 1999-2001 ej22 head gaskets line up perfectly with the EJ20 heads I wouldn't be using them if they didn't. Modifying head gasket is a thing I never do. Ill get some pictures when I can.

Also the point of running of running this is you need the thinnest head gasket you can. Running an OEM EJ22T will leave you with a CR below 7:1. Yes you can get a custom head gasket made for the EJ22T. But why do that when you can get a MLS Felpro for $25 a piece.

And dropped the block off at the machine shop earlier today. It's a good shop but a busy one so I'll get it back probably next week.


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 Post subject: Re: EJ22T Pistons
PostPosted: Fri Nov 24, 2017 9:17 pm 
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Joined: Thu Oct 26, 2017 2:31 am
Posts: 6
Finally able to get back to this. The engine is up and running beautifully with the exception of a oil leak I'm tracking down.

Have some pictures off the pistons sitting at TDC in the block before I sent it back out for the final decking and cleaning and you will have to excuse me I'm not much of a picture taker and my phone has a ok camera.

Image


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 Post subject: Re: EJ22T Pistons
PostPosted: Mon Nov 27, 2017 5:15 am 
First Gear
Joined: Mon Feb 27, 2012 6:20 pm
Posts: 52
Very nice! Be sure to post some updates through the life of this engine, curious to see how these hold up.


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 Post subject: Re: EJ22T Pistons
PostPosted: Mon Nov 27, 2017 1:06 pm 
Fifth Gear
Joined: Fri Jun 20, 2008 8:17 am
Posts: 6233
Location: Lakewood, Wa 98439
Yeah this is definitely pretty cool!!!

_________________
91 L-TW Wagon with a full Swap -RIP
92 SS Prefaced, GD dash swapped, 22T/205 Hybrid 20 psi - BEAST!
93 SS Bone Stock Gone!
94 TW Bone Stock Gone!
91 SS 4EAT Sold!
98 LGT 4EAT
98 LGT Wagon 4EAT


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 Post subject: Re: EJ22T Pistons
PostPosted: Tue Nov 28, 2017 2:06 am 
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Joined: Thu Oct 26, 2017 2:31 am
Posts: 6
Absolutely, my new o2 sensor comes in tomorrow and will be doing some WOT tuning soon, see how things go.


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 Post subject: Re: EJ22T Pistons
PostPosted: Fri Dec 01, 2017 6:56 am 
First Gear
Joined: Mon Feb 20, 2012 5:44 pm
Posts: 203
Location: Salt Lake City, UT
This is so cool!

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93 SS - Wife's DD, Walbro 255, Boost gauge, POWER mode!, RobTune on the way!!!
03 WRX 22T/205 20GXT 350 whp
95 BK - Sold to my neighbor.


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 Post subject: Re: EJ22T Pistons
PostPosted: Sun Dec 03, 2017 12:39 am 
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Posts: 2456
Location: Missoula
Yeah, that's neat. Were you able to calculate compression ratio? How far in the deck are they?

2mm longer rods are pretty readily available. Or, conversely, a 2.5 crank could be used if there's that much room. These might be a way to make a super budget 2.34 turbo block out of a phase 2 2.2.

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 Post subject: Re: EJ22T Pistons
PostPosted: Sun Dec 03, 2017 10:11 pm 
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Joined: Thu Oct 26, 2017 2:31 am
Posts: 6
Final compression ratio was 7.4 :1 with using the OEM combustion chamber size of the WRX heads. I used that due to not be able to measure mine correctly but since I had them shaved 0.006 I can comfortably say I'm at 7.5 : 1. And I think final measured for piston to deck height was 0.12 in the hole.

Also I already had all the parts I put in here because I got most of it for dirt cheap (quite a bit free). The STI rods I got were free so using them was a must because I was trying to do this as cheep as possible.


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