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Old 07-05-2008, 10:35 PM   #1
ciper
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Default Early SOHC intake manifold bolt to phase 2 SOHC heads?? Will ECU work with cam sensor

I am curious if an intake manifold from a phase 1 EJ22 (1990-96 I believe) will fit on phase 2 EJ25 SOHC heads (99+).

Secondly will the EJ22 cam sensor and gears work with the phase 2 heads? I thought that some cam gears had a fifteen degree rotational difference but unsure of what type.

Thanks.
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Old 08-06-2008, 01:11 PM   #2
EvenSteven
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I think thats the same thing im trying to find out. I have been searching and havent found out yet. I just want to put phase 2 sohc heads on my phase 1 2.5L Dohc motor. I just want to know that i could use my old sensors. Also, i was wondering if it would lower my compression ratio if i use the Sohc phase 2 heads.
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Old 08-06-2008, 01:25 PM   #3
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Phase one intake will not fit on a phase 2 motor, or vice versa.

You can put phase 2 heads on a phase 1 motor, and then run the phase 2 intake, no problem.

Sensors are the same, I bolted a phase 2 RS motor into my '95 L (1.8) and didn't re-use any of the stock sensors, ran just fine.

and if anyone knows the answer to the compresssion issue, I need to know what mine's gonna be, with RS heads on a '97 2.2l. Good information here:

http://wac.addr.com/auto/obs/turbo/ejcalcs.html

I know it will lower compression because the phase 2 heads have an extra ~10cc's of volume.

I just calculated mine to 8.4:1 using a phase 1 ej22 block, phase 2 ej25 heads.

Last edited by tooocool49723; 08-06-2008 at 01:31 PM.
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Old 08-08-2008, 05:00 PM   #4
EvenSteven
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yah, low compression is not going to fly. But i should be able to deck the head to make it equal right? either that or go with higher compression pistons. Do you think it would turn a motor into a non-interference motor?
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Old 08-09-2008, 11:02 AM   #5
Matt Monson
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The flat four configuration of our engines makes decking the block or milling the heads something you can only do just barely enough to correct warpage. If you go any further you encounter all kinds of issues.

The first and most prominent one is that you are altering the timing. You are advancing timing on one bank of cylinders while retarding it on the other. The next thing that becomes an issue is that your timing belt is now too long and is looser than it is supposed to be. Lastly, while you have raised the compression, you now have pistons that could potentially hit the bottom of your combustion chamber. I am not talking about bending valves. I am talking about pistons slapping into the heads themselves.

The only right way to do this would be to get custom pistons made for your Ej22. However, for that cost, you can get a good used Ej25 bottom end for less.

As to the original question, you cannot bolt up a phase I Ej22 or a phase I Ej25 manifold to phase II SOHC Ej25 heads. You will need to use the correct Ej25 manifold that mates to the heads. Before you jump in with this project, hit the conversions forum. There's a kid over there right now who is having all manner of issues with a similar swap. Read his thread and solve your problems before you have your car in a pile of parts in the driveway.
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Old 08-25-2008, 07:17 PM   #6
ciper
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I verified that in fact the early SOHC bolt pattern is ever so slightly different from the later SOHC bolt pattern. Pictures would tell you otherwise (they are extremely similar) but I ordered one of each gasket and then it was obvious.

Now does anyone have advice on how to use a phase 2 ej25 bottom end in my 91 legacy with no wiring changes?
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Old 08-26-2008, 12:09 AM   #7
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You could reuse your stock heads, and use the intake manifold that goes along with it. Only problem is your CR will be alot higher than stock and you HAVE to run premium gas.

As far as your CR with EJ22 block and EJ25 SOHC heads: I calc'd a CR of about 8.6-8.7:1.


~Josh~
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Old 08-26-2008, 05:35 PM   #8
ciper
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I dont have my notes on this laptop but the ej22 heads on the phase 2 ej25 results in a compression ratio of well over 12:1

Im considering to cut the "legs" off an ej25 sohc manfiold and welding my manifold to it.
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