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Old 11-01-2012, 09:47 PM   #226
FuJi K
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^^^^

Your rods are iffy, your pistons should definitely change if those are not meant for the STi 79mm crank.You need pistons designed for the 79mm stroke. Manley does offer them.
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Old 11-01-2012, 10:19 PM   #227
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Edit nm

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Old 11-02-2012, 12:54 AM   #228
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what exact rods and pistons do you recommend?
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Old 11-02-2012, 01:23 AM   #229
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what pistons and rods would you recommend for me?
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Old 11-02-2012, 01:47 AM   #230
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If you're going to this much trouble, why not build a 2.5? You get more displacement and pistons are easy to find because every company makes them. In that case I would suggest a rod that isn't a cheap H beam. There are quite a few choices, Manley turbo tuff, BC I beams, pauter, crower I could go on but you get the idea. For pistons I would say JE FSR are a good choice. I think you need to do a lot more research if you're mentioning a gt40+ turbo, NOS, and Manley H beams in the same post. With that sort of build you'll need to know more info and use a higher flow fuel system too.
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Old 11-02-2012, 05:03 PM   #231
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i would love to build a 2.5 but thats 7000+ dollars i dont want to spend. and the JE FSR pistons are bore for a sti so they wont work.

- i will go with bc I-BEAM CONNECTING RODS Subaru EJ205/EJ257 w/ARP2000 Fasteners
- what about these pistons? http://www.6starspeed.com/wisuwrx92mmf.html
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Old 11-02-2012, 05:43 PM   #232
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Quote:
Originally Posted by subarugod91 View Post
That's for the 75mm stroke

You need the stroker pistons, 79mm
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Old 11-02-2012, 10:54 PM   #233
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Do you already have a sleeved 2 liter engine?
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Old 11-02-2012, 11:58 PM   #234
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Old 11-03-2012, 01:40 AM   #235
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Then where did your 7000 dollar figure come from? A brand new 2.5 case is like 1k. Used are way cheaper. And the rest of the build would be the same. Same crank, rods, bearings but you could do the sti pistons and the bigger sleeves. I think when you're spending thousands on the engine build you aren't really looking at much more to do the 2.5 when it's a few hundred.
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Old 11-03-2012, 08:26 PM   #236
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well could i use the ej205 heads and manifold? and wont the bigger block mess with the computer and such?.
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Old 11-03-2012, 09:15 PM   #237
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with a ej25 block?
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Old 11-03-2012, 09:16 PM   #238
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Quote:
Originally Posted by subarugod91
well could i use the ej205 heads and manifold? and wont the bigger block mess with the computer and such?.
Research hybrid build.
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Old 11-03-2012, 10:00 PM   #239
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You can use the 2.5 block with 2.0 heads. You need to do a lot of research before you actually start this build. Not trying to be an ass or anything because obviously research is what you're doing now. Reading this thread a couple times should help you some, look through the built motor forums for a few weeks and you'll have a better idea what you need to do. Then when you have more specific questions it will be easier to help you.
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Old 11-04-2012, 01:49 AM   #240
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okay thanks
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Old 11-04-2012, 04:26 PM   #241
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I'm building a 22t shortblock to go with my 20k sti heads. Has anyone measured the bores on a set of 22t cases with/without torque plates?

I know this block is much more structurally sound (denser alloy and cdb) than an open or semi closed deck, but I have all the stuff to make a set of plates if needed.
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Old 11-06-2012, 12:21 PM   #242
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^ Use the torque plate regardless...
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Old 11-27-2012, 02:44 PM   #243
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After swapping in an ej257 hybrid with ej205 S20 heads and thicker head gaskets into my car (I got this motor complete as a hybrid) I had a head gasket leak so, I pulled it back out and pulled the heads. Now that the motor is apart, I'm thinking that I should use a better setup when putting it back together. The cams in the ej205 heads I have are Kelford 272 and the valves and springs are Crower. I did some research and believe that I can swap the cams and valves with springs into ej257 B25 heads. I'm not wired for AVCS so I'm hoping that I can run my Kelford cams and Crower valves/spring in the B25 castings and use the ej205 S20 non-avcs cam gears. That's the long-winded setup for my question: Can I use ej205 S20 cams, cam gears and valves/springs in ej257 B25 heads and run it on my ej205 ECU for 2002 WRX?

I ask because on paper this sounds like a good option as opposed to sending my ej205 S20 heads out to be chamber matched because of the cost and the fact that the S20 castings are prone to cracking around the spark plug hole.
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Old 11-27-2012, 03:29 PM   #244
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Quote:
Originally Posted by Soarer
Can I use ej205 S20 cams, cam gears and valves/springs in ej257 B25 heads and run it on my ej205 ECU for 2002 WRX?
Yes you can.
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Old 11-28-2012, 01:05 PM   #245
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Quote:
Originally Posted by Soarer View Post
After swapping in an ej257 hybrid with ej205 S20 heads and thicker head gaskets into my car (I got this motor complete as a hybrid) I had a head gasket leak so, I pulled it back out and pulled the heads. Now that the motor is apart, I'm thinking that I should use a better setup when putting it back together. The cams in the ej205 heads I have are Kelford 272 and the valves and springs are Crower. I did some research and believe that I can swap the cams and valves with springs into ej257 B25 heads. I'm not wired for AVCS so I'm hoping that I can run my Kelford cams and Crower valves/spring in the B25 castings and use the ej205 S20 non-avcs cam gears. That's the long-winded setup for my question: Can I use ej205 S20 cams, cam gears and valves/springs in ej257 B25 heads and run it on my ej205 ECU for 2002 WRX?

I ask because on paper this sounds like a good option as opposed to sending my ej205 S20 heads out to be chamber matched because of the cost and the fact that the S20 castings are prone to cracking around the spark plug hole.
What thickness gasket did you use? Anything under .045 and you should be good. Why didn't you use a deeper dish piston to keep the cr down instead of using a super thick hg? Je makes a hybrid piston with a 26cc dish. That coupled with a cosworth 1.1mm gasket would give you 8.2 cr with 205 heads.
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Old 11-29-2012, 01:11 PM   #246
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From what I gather from this thread, I can use a 2.2 with STi crank and rods with Weisco pistons (K602M975) and either S20 or B25 heads. The B25 will give me a high 7 CR while the S20 will give a mid to high 8 CR, HG would be stock 2.2L. Is that correct?

Also there's reference to Manley and JE making pistons for this setup but when I checked their website I didn't see them. JE's lists 97mm pistons for a 75mm stroke and Manley's lists 79mm stroke but for 92mm pistons. Would they be special order then?
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Old 11-29-2012, 03:24 PM   #247
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Quote:
Originally Posted by romanlynch View Post
From what I gather from this thread, I can use a 2.2 with STi crank and rods with Weisco pistons (K602M975) and either S20 or B25 heads. The B25 will give me a high 7 CR while the S20 will give a mid to high 8 CR, HG would be stock 2.2L. Is that correct?
Yes you can use those pistons.
They give you around 8:1 on D25 heads and they are also about 98mm across so that gives you a pretty good match.
You can use them with Sti heads but your compression ratio will be around 7.6 and the Sti chamber is slightly bigger across. That would not be ideal in my opinion.
The Wrx heads would make it similar to a ej25 hybrid build and give you a compression ratio around 8.1-8.2.

All those compression ratios are without head work or decking of the heads or block. If you do any of that stuff it changes a little but this is a good estimate.

For some reason the compression height on those pistons is slightly less than an ej25 which gives you larger squish height and lower compression ratio.

Quote:
Originally Posted by romanlynch View Post
Also there's reference to Manley and JE making pistons for this setup but when I checked their website I didn't see them. Would they be special order then?
Yeah they would be special order. I haven't ever special ordered them but when I was looking into it the rep in the phone seemed to be pretty able to work with me. Seemed easy enough if you know all the specs you want.
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Old 11-29-2012, 05:33 PM   #248
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So if I call and talk to a rep and tell them the application and what CR I'm shooting for would that be enough or do I need to know all the dimensions etc?
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Old 11-29-2012, 07:38 PM   #249
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Quote:
Originally Posted by romanlynch
So if I call and talk to a rep and tell them the application and what CR I'm shooting for would that be enough or do I need to know all the dimensions etc?
Have a shop or vendor call for you. You could get like Maxwell to set the order. CP or JE etc won't make a set of pistons for you unless you're a shop. I tried back in the day, i had to go through JSC Speed to get my custom CP's made.
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Old 11-29-2012, 08:06 PM   #250
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I think I had talked to supertech or Wossner can't remember which. But As Fuji said order through a vendor and you should be able to get what you want. 2.2L is like a curse word to Dom though lol he doesn't like them. He'd probably still be able to order them for you, or Micah at 3MI, Matt at Ball racing, Turn in concepts etc.
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