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12-03-2020, 10:26 AM | #1 |
Scooby Newbie
Member#: 520567
Join Date: Nov 2020
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Need some hybrid motor advice!
I have a phase 1 22t block that I plan to put into my 04 WRX sedan, I am curious if I should use the heads off of my stock ej205 or I could use some 251 heads with Delta 1500 cams that's have been port and polished, I've heard the 251 heads will require modification and some wiring to make them work where as the 205 heads should work fine, also what head gasket should I be using for the 251 heads? There's a ton of info on using the 205s but can't seem to find much on the 251/ 22t hybrid, also I'm curious what injectors I should be getting to support 380-400hp? Thank you!
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12-03-2020, 11:57 AM | #2 |
Scooby Newbie
Member#: 501997
Join Date: May 2019
Chapter/Region:
Tri-State
Location: Atglen PA
Vehicle:2011 WRX gray |
Sorry I dont know much about the 22t block I do remember seeing either of those heads should mate up but the 205 heads may make the compression ratio too high. For 380 to 400hp I would go with no less then 850cc injector. 1000cc would be better to give some headroom for future upgrades.
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12-04-2020, 11:35 AM | #3 |
Scooby Specialist
Member#: 29292
Join Date: Nov 2002
Chapter/Region:
SCIC
Location: Orange County CA
Vehicle:2004 WRX wagon silver |
i believe with the 205 heads it bumps the compression up to around 9ish the 2.5 heads wont work and the work you put into them would not be worth the gains. What would be really cool is for you to find a set of jdm heads with avcs and hook that up that would be awesome
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12-04-2020, 03:59 PM | #4 |
Scooby Specialist
Member#: 437670
Join Date: Jan 2016
Location: VT
Vehicle:2005 2.5 SC OB |
The easiest thing will always be to keep your stock heads.
Try this video, although it applies to a EJ25 block and EJ20 heads. For injectors - what fuel are you using? Last edited by pcampbell; 12-04-2020 at 04:57 PM. |
12-06-2020, 09:06 PM | #5 | |
Scooby Newbie
Member#: 520567
Join Date: Nov 2020
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12-06-2020, 09:07 PM | #6 | |
Scooby Newbie
Member#: 520567
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12-07-2020, 09:17 AM | #7 |
Scooby Specialist
Member#: 191514
Join Date: Oct 2008
Chapter/Region:
NWIC
Location: teh bremerton
Vehicle:'05 FXT 6spd, 98 Fozzy lifted,'01 RS 6spd |
Did this 12 or 13 years ago. You’re going to be low, like 7.7 or so with a .058 gasket and sohc heads if I remember right. We did k heads on a 22t with 47cc combustion chambers. There are some good threads about this out there.
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12-07-2020, 11:38 AM | #8 |
Scooby Specialist
Member#: 29292
Join Date: Nov 2002
Chapter/Region:
SCIC
Location: Orange County CA
Vehicle:2004 WRX wagon silver |
cause your dealing with a 92mm bore and a head that is meant for a 99.5mm bore. you will have 8.5mm of your chamber being too big for the bore on the head side and you will have a weird chamber overlap between your heads and your cylinder bores.
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12-07-2020, 06:40 PM | #9 |
Scooby Specialist
Member#: 191514
Join Date: Oct 2008
Chapter/Region:
NWIC
Location: teh bremerton
Vehicle:'05 FXT 6spd, 98 Fozzy lifted,'01 RS 6spd |
Throw a used head gasket on the ej22 and see if it'll clear or measure your 251 combustion chamber and see if they'll fit inside of the 97mm bore. You'll also need to figure out what coils you are going to use. Some are using newer NA COP and install a stud in the covers to mount them. My 2001 RS ej257 with 251 head set up is using GM LS coils mounted on brackets with short custom wires, I also run WRX manifold and sensors.
Last edited by theotherguy; 12-07-2020 at 06:43 PM. Reason: spelling |
12-09-2020, 02:08 PM | #10 |
Scooby Specialist
Member#: 333468
Join Date: Sep 2012
Chapter/Region:
RMIC
Location: SLC, UT
Vehicle:93 SS - 06 OB XT 03 WRB GD 205/22T 20G-XT |
I run an EJ22T with 205 heads that I chamber matched to the 22T bore. You can see my build thread here: https://forums.nasioc.com/forums/sho....php?t=2696523
I really like the setup and put down around 350-360 whp with a Blouch 20G-XT. For injectors you should be fine with some DW 1050s. |
12-12-2020, 11:57 PM | #11 |
Scooby Newbie
Member#: 520567
Join Date: Nov 2020
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I'd be using the 22t block not the 2p5 block
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12-12-2020, 11:57 PM | #12 | |
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12-13-2020, 11:40 AM | #13 |
Scooby Specialist
Member#: 191514
Join Date: Oct 2008
Chapter/Region:
NWIC
Location: teh bremerton
Vehicle:'05 FXT 6spd, 98 Fozzy lifted,'01 RS 6spd |
Coil on plug would be easiest as you wouldn't have to modify your harness much and wouldn't have to change the dwell in your ecu. Ultimately I'd recommend monkeyposeur's build thread, it's a tried and true recipe for awesomeness or sell the block and buy another JDM engine. |
12-15-2020, 11:38 AM | #14 |
Scooby Specialist
Member#: 29292
Join Date: Nov 2002
Chapter/Region:
SCIC
Location: Orange County CA
Vehicle:2004 WRX wagon silver |
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