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Old 02-07-2014, 10:43 AM   #1
MilkRSTi
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Default Calling the subaru gods

I need all the Subaru gods right now.. I'm gonna be buying either another bugeye or a 04 Wrx limited. My friend is gonna sell me his 2007 2.5 STi short block which has rod knock. I'm going to get the block built by my friend and me (who's selling me the block and who will also be teaching me). Rods, pistons, bearings. Only building the bottom end.

I know the 2.0 heads fit on the 2.5 STi block, but will I need to change any wiring harness or is it a "direct bolt on" and just slap the head right on and I'm good? I wanna get all the info I need before I start a project and screw myself in the end. Please charm in with any advice. Thanks!
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Old 02-07-2014, 11:15 AM   #2
slowgenius
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Im not a god, but i know if the 2.0 liter heads are being used with the 2.5 liter block there is no wiring to change.
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Old 02-07-2014, 11:32 AM   #3
25rsti
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Search Hybrid. That's what you're trying to make by putting the 2.0 heads on the 2.5 shortblock.

You should search on the hybrid topic and you will get all yours answers BUT I will tell you, you do NOT want to just slap those heads on and call it a day. You WANT to get the head chambers machined opened wider to the 2.5 block size, along with many other things that should be done.
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Old 02-07-2014, 12:35 PM   #4
MilkRSTi
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Thanks fellas
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Old 02-07-2014, 01:00 PM   #5
gfx2043
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I'm using S20 (EJ205) heads on my hybrid and there is no wiring change and they will bolt right up. The issues you will face are what to do with the extra crank case vent on the block (extra valve cover breathers and "T" it in), what to do about the compression quench issue, and what cams to use (Stock WRX cams will completely fall on there face at ~4K rpm, 260 or 272 cams are a perfect drop in for good HP). I had Ed at EQ tuning cnc the chambers on my heads and it made a world of difference when tuning it. I can run way more timing then any hybrid with stock S20 heads ever tuned could. The power is way better and smoother as an added benifit. I have zero knock issues as most hybrids fight this problem. I would recommend this service as a must for any hybrid followed by cams. Jr checked out my car at P&L and right off off the bat by looking at the ignition maping he asked me "so how do you like running ED's heads". I now have over 22K on my built motor with 0 issues. I'm also running between 365 AWHP on 93 and 437 AWHP on E85, so the motor is running far from stock HP numbers.
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Old 02-07-2014, 01:42 PM   #6
danger1138
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No wiring change; build block, slap on the heads, tune, and your good to go.

Edit: Yea ^^ follow his instructions. While its all apart you might as well drop in at the minimum sti cams or better in case your looking to create more power in the future , the stock wrx cams will hold u back. In regards to slapping the heads with or without CNC, its been beat to death. There are success stories on both ends. Now looking back i wish i would have dropped in sti or better cams, but still happy with my build. Currently at 40k miles and running strong.

Last edited by danger1138; 02-07-2014 at 01:48 PM.
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Old 02-07-2014, 05:40 PM   #7
MilkRSTi
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Yea I was thinking while it's all apart I should just save up and do the heads too. My friend got a price from a place in NJ for his 2.5 head - 272 cams, valves, blah blah, 2,200$.. Ok I got another question. I've seen people say it cost them nearly 4k to build just their bottom end. I looked up

Manley h beam rods 401$
Acl bearings $56
Mahle pistons 530$

And it came to like 987$ plus I'll need a new mAin seal. Also if it has a rod knock will it need some machine work? I know about engines how they work, but not when it comes out to with having it machined and other complicated stuff. But I wanna learn all of this
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Old 02-08-2014, 01:29 AM   #8
gfx2043
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With a rod knock you can be almost 100% sure the crank will have some scoring on it. Plus if you are building a used block the cylinders will have to be machined to fit the pistons properly, and all clearances should be checked when done. Machine shop work alone usually runs around $350-$800 depending on who does it and what you want done. Your build list should also include ARP head studs, a new oil pump, complete gasket kit, and a timing belt kit. These parts are standard for a new built motor.
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Old 02-08-2014, 09:11 AM   #9
danger1138
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Quote:
Originally Posted by gfx2043 View Post
With a rod knock you can be almost 100% sure the crank will have some scoring on it. Plus if you are building a used block the cylinders will have to be machined to fit the pistons properly, and all clearances should be checked when done. Machine shop work alone usually runs around $350-$800 depending on who does it and what you want done. Your build list should also include ARP head studs, a new oil pump, complete gasket kit, and a timing belt kit. These parts are standard for a new built motor.
Also new timing belt tensioner, not sure if its included in the kit as well. Dont, DO NOT skip out on getting a New Oil Cooler ..
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Old 02-08-2014, 09:51 AM   #10
MilkRSTi
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Yea, when I ran it by my other friend he told me the same thing about the crank. I don't wanna half ass anything the cheap way out like I did with my bugeye. Rather pay for quality this time. My old bugeye was rigged with Raceland Coilovers, junkyard rear suspension (all LOOSE bolts from previous owner). Car was a mess
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Old 02-08-2014, 10:58 AM   #11
Irv Weissmanhowerton
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do the equilibrium head mod, send them in, then they machine it to perfectly match to the 2.5 sb, search the results and the specifics on what they do and what the mod does, its worth it from what Ive heard
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Old 02-08-2014, 11:53 AM   #12
MilkRSTi
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Cool, will do guys. I wanna get the car, drive it for a little. Save up for parts, then start my motor build/tranny swap- doing a 6 speed. I got another question, do my dw 750cc injectors from my 02 Wrx fit? Yea right? I have injectors, 255 fuel pump in my garage brand new I never used for my bugeye. This is also not going to be my daily driver, just like a "weekend" car. I have a normal daily
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Old 02-10-2014, 12:34 PM   #13
gfx2043
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I second Danger. I completely forgot about the oil cooler. If you reuse the old one and the motor had a rod knock you will more then likely destroy the new motor when the shavings come out of the cooler. Everything will transfer over including the intake, oil pump, oil cooler etc. The only thing that you need that is EJ257 specific will be the head gaskets.
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Old 02-10-2014, 02:57 PM   #14
wylo868
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hey guys looking for a bit of advice am the owner of a forester cross-sport and am based out in trinidad and tobago I wanna replace my engine and trannie to a modified engine and gearbox for street and track i was wondering if you guys might be able to help by recommending any performance building shops thanks a lot.
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Old 02-10-2014, 05:39 PM   #15
MilkRSTi
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Quote:
Originally Posted by gfx2043 View Post
I second Danger. I completely forgot about the oil cooler. If you reuse the old one and the motor had a rod knock you will more then likely destroy the new motor when the shavings come out of the cooler. Everything will transfer over including the intake, oil pump, oil cooler etc. The only thing that you need that is EJ257 specific will be the head gaskets.
Thank you
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