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JDM motor questions

   
Old 10-12-2011, 09:23 AM
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Originally Posted by code3suby
From every shop I've talked to (I went through the same thing) you can't really get a proper leak down or compression test unless the motor's been fully lubricated and run.

My motor had ~15 psi on one side and ~30 and turned out to be fine.
if i didn't hear about the 60 on the 4th cylinder, i probably would have had it installed.

Originally Posted by EQ Tuning
Where was the leakage going? Past ringlands or valve? Was the motor ever exposed to a lot of moisture or possibly hosed down? It might be a good idea to put a boroscope in there and look at the cylinder walls. I've seen people wash their motors and rust out the cylinder walls.

The 20% wouldn't worry me as much, but the 60% is definately cause for concern.

-- Ed
can't agree more. that 60%, i am concerned.

Originally Posted by Krinkov
lol of course he just wants you to just install it rather than return it, would else would he say??

where did you get it from BTW? Also 02-03 should be the V7s, and 04-05 are the V8s. The V8 has no TGVs, better cams, and the twin-scroll turbo/headers. Does yours have TGVs?
sorry, it's v8...04-05. motor is from canada.

Originally Posted by Hoofus
If it had sleeves put it it could have a touch of rust. Have you tried running the engine then re-doing the test after its cool?
stock motor, so i don't think it's been sleeved. engine is on engine stand and just want to be sure before it gets put back in.
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Old 10-12-2011, 12:18 PM
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I really wouldn't put it in with a 60% leakdown on a cylinder. Do you know where the leakage was going? You can listen to the oil filler neck, intake, and exhaust to tell where the air is going.

-- Ed
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Old 10-12-2011, 12:27 PM
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Originally Posted by Krinkov
lol of course he just wants you to just install it rather than return it, would else would he say??

where did you get it from BTW? Also 02-03 should be the V7s, and 04-05 are the V8s. The V8 has no TGVs, better cams, and the twin-scroll turbo/headers. Does yours have TGVs?
The v7's don't have TGV's neither. And ver7 is 01-02 ver8 03-06? I don't think the JDM hawkeyes where considered ver9. Should have shared the same twin-scroll 207.
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Old 10-12-2011, 12:57 PM
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Originally Posted by LOL VTEC
The v7's don't have TGV's neither. And ver7 is 01-02 ver8 03-06? I don't think the JDM hawkeyes where considered ver9. Should have shared the same twin-scroll 207.
yes, the V8s were 04+, and the V7s had bare TGV bodies, while the V8s hadthe TGVs deleted altogether. thanks for the correction.

Originally Posted by EQ Tuning
I really wouldn't put it in with a 60% leakdown on a cylinder. Do you know where the leakage was going? You can listen to the oil filler neck, intake, and exhaust to tell where the air is going.

-- Ed
this, just send it back and get another one.
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Old 10-13-2011, 11:38 AM
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Originally Posted by LOL VTEC
I bought mine from a member. Did the leakdown test. Numbers came back as if the motor was off the Subaru assembly line. So I put it in.

Not like it matters, but what version did you get? sounds like a good excuse to go built!
Same here
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Old 02-28-2012, 12:53 PM
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this test was taken yesterday with the motor installed.....

Cylinder 1 = 144 psi with 3% leak down

Cylinder 2 = 144 psi with 5% leak down

Cylinder 3 = 138 psi with 16% leak down

Cylinder 4 = 145 psi with 1% leak down

question now is. can the leakdown numbers improve with the motor running a bit longer on idle and drive it a bit?
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Old 02-28-2012, 12:57 PM
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A little bit but not much. The high number three would scare me since that's a common source of failure.
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Old 02-28-2012, 01:03 PM
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Originally Posted by chochocho
this test was taken yesterday with the motor installed.....

Cylinder 1 = 144 psi with 3% leak down

Cylinder 2 = 144 psi with 5% leak down

Cylinder 3 = 138 psi with 16% leak down

Cylinder 4 = 145 psi with 1% leak down

question now is. can the leakdown numbers improve with the motor running a bit longer on idle and drive it a bit?
I think Ed asked earlier in the thread but where is it leaking from? intake? exhaust? rings?
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Old 02-28-2012, 03:59 PM
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Originally Posted by wrxBRAH
I think Ed asked earlier in the thread but where is it leaking from? intake? exhaust? rings?
didn't verify where it was leaking from or leaking to......

in any case, it's looking like the only way to know and fix the problem is to get the motor out and do a teardown.
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Old 02-28-2012, 04:51 PM
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Originally Posted by chochocho
didn't verify where it was leaking from or leaking to......

in any case, it's looking like the only way to know and fix the problem is to get the motor out and do a teardown.
^This should have been done in the beginning after the leakdown test.
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Old 02-28-2012, 04:57 PM
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Originally Posted by chochocho
didn't verify where it was leaking from or leaking to......

in any case, it's looking like the only way to know and fix the problem is to get the motor out and do a teardown.
It may be worthwhile to check where the leakage is going before pulling the engine.

-- Ed
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Old 02-28-2012, 05:41 PM
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Originally Posted by EQ Tuning
It may be worthwhile to check where the leakage is going before pulling the engine.

-- Ed
For real!



Just drive it to you local shop and have them give it a once over.
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Old 03-01-2012, 04:05 PM
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Originally Posted by strider327
^This should have been done in the beginning after the leakdown test.
i cannot agree more. live and learn.....

at the time though........supplier insist that it's good and teardown would void the not so useful warranty.....
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Old 03-01-2012, 04:07 PM
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Originally Posted by OneManArmy
For real!
Just drive it to you local shop and have them give it a once over.
originally, i wanted to put in some new plugs and run it some more and see if the results gets any better.....but i am going to get to the bottom of this 16% leakdown in cylinder #3.
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Old 03-26-2012, 08:39 AM
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caked on carbon buildup in both pistons and valves causing the bad numbers, i was told. was running rich for a long time as cylinder #1 and #3 was worst.

everything else looked okay. no headgasket failure.

getting a rebuild..........

gotta write a review on my engine supplier (not local).
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