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Old 12-20-2005, 04:57 PM   #1
Cstmboxermotorsports
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Default EJ22 heads on an EJ18

Ok so im just screwing around with a bunch of engines i have laying around and I decided to make an incredibly fast EJ18. Now I've heard of people putting EJ18 head on an EJ22 to raise compression but what would happen if i put a set of heads from a 93 Turbo legacy on the EJ18 Block?

BTW i am turboing this engine with the turbo peices off of the Turbo legacy block considering their all just sitting there after i stripped down the engine for the short block.
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Old 12-20-2005, 06:25 PM   #2
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I've heard of putting SVX pistons in the ej22 to raise compression, or something to that effect.

It will probably breathe better, I guess.
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Old 12-20-2005, 09:26 PM   #3
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Quote:
Originally Posted by Cstmboxermotorsports
Now I've heard of people putting EJ18 head on an EJ22 to raise compression but what would happen if i put a set of heads from a 93 Turbo legacy on the EJ18 Block?
Lower the compression...
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Old 12-21-2005, 04:19 PM   #4
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Quote:
Originally Posted by Kostamojen
Lower the compression...
so no good for turboing
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Old 12-21-2005, 04:30 PM   #5
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Quote:
Originally Posted by Cstmboxermotorsports
so no good for turboing
Depends on what the final compression ratio is. Do the math.
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Old 12-21-2005, 07:36 PM   #6
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Quote:
Originally Posted by Cstmboxermotorsports
so no good for turboing
Lower compression = better for turboing.

However, with larger heads on there, you could end up with valves that will hit the cylinder wall or even the pistions because of the valve grooves on the pistions. At least that is what I found when I test fit EJ20 heads on an EJ18 block.
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Old 12-22-2005, 01:49 PM   #7
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Quote:
Originally Posted by Kostamojen
Lower compression = better for turboing.

However, with larger heads on there, you could end up with valves that will hit the cylinder wall or even the pistions because of the valve grooves on the pistions. At least that is what I found when I test fit EJ20 heads on an EJ18 block.
EJ20 heads are also DOHC, unlike the EJ18 and the EJ22 which are SOHC.. would this make a difference?
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Old 12-22-2005, 01:51 PM   #8
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I have heard that the turbo heads from the legacy don't flow as well as others.
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Old 12-23-2005, 06:45 PM   #9
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Quote:
Originally Posted by Cstmboxermotorsports
EJ20 heads are also DOHC, unlike the EJ18 and the EJ22 which are SOHC.. would this make a difference?
Its about valve size/piston design, and whether the valves will physically hit the cylinder walls. Its got nothing to do with DOHC or SOHC.
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Old 12-23-2005, 06:46 PM   #10
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Quote:
Originally Posted by subyswamper
I have heard that the turbo heads from the legacy don't flow as well as others.
They physically nearly identicle to the phase I EJ22 and EJ18 heads.
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