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Old 08-25-2005, 05:06 PM   #1
turboed22
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Default EJ257 Short-block Swap

I have searched and searched and can't find an exact answer to my question.
Can you keep a factory computer/fuel system when you swap a ej257 short-block into a MY98 rs.
I put the short block in and after days of troubleshooting I have narrowed it down to my ignition timing. When each cylinder was at TDC there was alway a nipple under the crank sensor on my factory phase 1 ej25. On the new one the nipples are not under the crank sensor when it needs to fire.
Does anyone know someone who does NOT run a standalone on a EJ257 hybrid swap?
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Old 08-25-2005, 05:13 PM   #2
Master2192
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hmm, that doesn't sound right. The timing ring should fit on just like it did before...
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Old 08-25-2005, 05:45 PM   #3
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Wait- did you use the crank timing gear off the the rs block? If not you need to. Otherwise it should work fine without a standalone.
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Old 08-25-2005, 06:28 PM   #4
turboed22
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This was with my factory crank sprocket. I tried the sti but the nipples are everywhere on it. Do you know anyone that has done this swap before?
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Old 08-25-2005, 06:48 PM   #5
Drac9
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I know several people who have done this swap with no issues.
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Old 08-25-2005, 11:02 PM   #6
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did you use the that timing gear thing that goes off the crank from your RS? I don't have that block, but I do have an ej20G running off a 1.8 ECU. The crank gear thing (sorry I'm not a mechanic) is different.

Chad
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Old 08-26-2005, 12:05 PM   #7
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hmm maybe this is a dohc only issue as I didnt have any probs with sohc '01 swap related to timing.
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Old 08-26-2005, 12:41 PM   #8
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I don't think so because I know a few people who have done this with DOHC cars as well. The motor turns fine by hand- with a ratchet, right? You didn't put the timing belt on backwards or anything did you?
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Old 08-26-2005, 01:22 PM   #9
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I have done the timing with my new belt and old belt ten times and hand cranked it over and it was perfect. Does anyone know if the phase 1 and the phase 2 ej25 has a different crank sprocket?
Thanks for your suggestions
Scott
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Old 08-26-2005, 01:27 PM   #10
Drac9
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As far as I know the sprockets are the same? How many teeth are on your sprocket? and these are RS heads, not legacy heads, right?
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Old 08-26-2005, 02:26 PM   #11
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Phase 1 RS Heads and there are six teeth total on my sprocket.
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Old 08-26-2005, 03:15 PM   #12
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Ok- so you're sure there is no spark? have you verified by pulling the plug wire off and grounding it? Any CEL's? All sensors hooked up? Do you have access to a scope?
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Old 08-26-2005, 05:31 PM   #13
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I get spark on all four cylinders it just at the wrong time. Do you know what crank sprocket they use?
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Old 08-26-2005, 06:06 PM   #14
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The RS crank sprocket. And it's keyed- so there's no way it should be off.
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Old 08-26-2005, 06:13 PM   #15
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It has to be the crank. It must be different than my stock one. I have found TDC on each cylinder and it lines up perfect on my old block. On the new one, at each cylinder the teeth dont line up. When I showed a couple of Subaru Guys with 22t swaps they didn't know why it doesn't line up. I am going to have to put a ej22t short-block instead.
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Old 08-26-2005, 08:48 PM   #16
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Quote:
Originally Posted by jdchmiel
hmm maybe this is a dohc only issue as I didnt have any probs with sohc '01 swap related to timing.
Same here.
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Old 08-26-2005, 10:48 PM   #17
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I have sohc heads for sale if you're interested.

Adam
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Old 08-28-2005, 02:20 PM   #18
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Drac9
Do you know of anyone that has done the swap into a phase1 motor has had any problems like mine? I think there is someting wrong with my crank on my new short block. I know the chances are slim to none but I will have to slit the block and swap the sti crank with my factory crank.
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Old 08-28-2005, 02:30 PM   #19
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I am about to perform this exact swap. I have both short blocks on my bench right now. Give me a little bit and I will post what I observe.

This is an interesting thread and it would have a quite a few implications for me as intend to run the factory ECU with a piggyback. I must pass OBD-II inpection. Better yet, we need to ensure it will run huh?

Be back with another observation.
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Old 08-28-2005, 03:34 PM   #20
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Guys-

I'll take anyone's input, but I am not seeing a physical or mechanical timing problem using the 98's Cam Timing Gear on an EJ257 Shortblock. Here's a link to all the photos I just took: http://community.webshots.com/user/djoncas14

Everything ends up in the same location mechanically.

Turboed22, are you certain you installed your Crank Position Sensor correctly? And I know you said you were sure, but are you 100% certain you installed the timing belt perfectly. These engines are a real bear. Did you replace your belt tensioner too? Go to www.endwrench.com and search for the old articles about changing timing belts on the Phase I DOHC's. A real eye opener for me.

Let me know. I do not see the problem you diagnosed in your first post.
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Old 08-28-2005, 05:21 PM   #21
turboed22
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Yes I had two Subaru Mechanics over to do the timing to make sure. There has to be something wrong with my crankshaft key because mine does not line up like yours does. Thanks for the pictures and I will post any new updates to help you for your swap.
Thanks
Scott
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Old 08-28-2005, 10:10 PM   #22
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Thanks and please do keep us updated. A problem like this would be devastating to my swap plans. I would probably rethink the whole swap if I was convinced I needed to abandon the EJ257/98 ECU plans.

Cheers.
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Old 08-28-2005, 10:21 PM   #23
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Swapped cranks wont work. The phase1 crank is center thrust- the phase 2 crank is rear throust. Plus the big end fournals are 52mm on the phase 2 crank and 48mm in the phase 1 crank.
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Old 08-28-2005, 10:28 PM   #24
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Drac9 - Although I would never swap the crank, thanks for the info. I don't think I will have a problem as the pics demonstrate.
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Old 08-28-2005, 10:34 PM   #25
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I know that there is something being missed here. I have 1 local customer, and at least 2 mail order customers who have been running the phase 1, 2.5 heads on an EJ257 shortblock for over a year now. You have to use all of the cam and crank gears from the Phase 1 engine, but it should work.
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