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Old 02-03-2013, 11:09 AM   #1
sorrowfulkiller
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Member#: 170439
Join Date: Jan 2008
Location: Sioux Falls, SD
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I <3 Lamp

Default EJ255 Shortblock with SOHC EJ22t Heads?

I'm in the process of building a car that is based off a lotus 7 chassis (see; locost, caterham, donkervoort) and I want to fit a subaru engine however a dohc will not fit without major changes to the chassis, I've done some measurements and have found that if I put sohc heads on they allow the engine to fit with only pushing the firewall back around 3-4 inches.

The block I am using is an ej255 out of a 2010 wrx, the heads are sohc ej22t heads off of some unknown car. Basically all I need to know is this.

1. Stock ej22t compressed hg size
2. ej22t combustion chamber volume.
3. If I used wrx or sti headgaskets do I need to make any modifications to the block or heads to run this combination.
4. I noticed the ej22t heads have the intake ports spaced out more for the spark plug hole, will these interfere with the stock ej255 pistons?
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Old 02-03-2013, 07:48 PM   #2
subi400
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Member#: 216984
Join Date: Jul 2009
Chapter/Region: NWIC
Location: Coeur D Alene, ID
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1996 Impreza outback
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Quote:
Originally Posted by sorrowfulkiller View Post
I'm in the process of building a car that is based off a lotus 7 chassis (see; locost, caterham, donkervoort) and I want to fit a subaru engine however a dohc will not fit without major changes to the chassis, I've done some measurements and have found that if I put sohc heads on they allow the engine to fit with only pushing the firewall back around 3-4 inches.

The block I am using is an ej255 out of a 2010 wrx, the heads are sohc ej22t heads off of some unknown car. Basically all I need to know is this.

1. Stock ej22t compressed hg size
2. ej22t combustion chamber volume.
3. If I used wrx or sti headgaskets do I need to make any modifications to the block or heads to run this combination.
4. I noticed the ej22t heads have the intake ports spaced out more for the spark plug hole, will these interfere with the stock ej255 pistons?
You would be better to run a ej251 dual port NA head because of the head volume in CC's and how the compression will come out. With the ej22T heads on the ej255 block I believe it would be at least 10:1 compression. Then you would have to mill out the combustion chamber on the sides in the ej22T heads to match the bore of the ej255 block. With running the ej251 NA dual port exhaust heads, these heads already match the bore of the ej255 block and actually have more options for cam upgrades.
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Old 02-03-2013, 09:54 PM   #3
sorrowfulkiller
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Join Date: Jan 2008
Location: Sioux Falls, SD
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I <3 Lamp

Default

I'm going to stay with the ej22t heads. I can get them cheap and in good condition. Plus it will be naturally aspirated. If I ever turbo it ill run wastegate pressure on a td04

Thanks for the info
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