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Old 04-11-2004, 05:21 PM   #1
supercompact
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Default Has anyone broken a rod or cracked a sleeve yet?

So far I have only seen people break pistons in the STI shortblock but everyone seems to think you have to upgrade the rods and sleeves to make mild power (~400hp). I know the sleeves are thinner than the other EJ's but how do we know that the quality of the iron used in the sleeves are not better than the EJ20. Aren't the rods forged from the factory? Even though the rods are smaller than a set of aftermarket rods, who is really going to make 1000hp to push the limits of aftermarket rods? I would just like to know what the limit is of the other parts of the shortblock.
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Old 04-11-2004, 07:24 PM   #2
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Good question.............
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Old 04-11-2004, 07:49 PM   #3
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I've only seen piston failures so far but then again, no one has gotten to over 450 whp yet.
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Old 04-12-2004, 12:11 AM   #4
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All I have heard of is piston/rod bearing failures so far for the 257. People aren't pushing enough power to oval even the thinner liners...yet.

The weak link in most subaru motors is by far the rod bearings from what I have seen. Followed by the pistons.
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Old 04-12-2004, 12:15 AM   #5
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The rods are identical to ver7 or 8 2.0 sti rods. They are forged and have the cap locating pins to keep them inline. These rods will take increased boost, but what's the magic number? Would the cylinder ovalise before the rod snaps?

The rods are probably the nicest internal component on that engine. The crank is identical to 2.5 NA motor, have only 1 oiling hole per journal, and sometimes are out of balance by enough to make a difference.

And we all know about the pistons already.

Ron
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Old 04-12-2004, 12:37 AM   #6
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Ron,
I thought that we talked about the rods being conventional castings. I probably misunderstood ya. Hey, that makes me feel better too. Maybe I might start saving for some nice CP's this summer maybe before imprezafest if I get a good job, haha.

Richard
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Old 04-17-2004, 04:53 PM   #7
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i snapped the number one rod. I took it to the dealership, and the wouldnt cover it under warrenty because of abuse. The car had 10,698 miles on it. They said that my intake and blow off valve caused it. Then the procedide to tell me that if i wanted to prove them wrong to pay them to pull the engine apart. What should i do????????????
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Old 04-17-2004, 05:03 PM   #8
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ask to test drive one of their stock cars and really show them what abuse can be..
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Old 04-17-2004, 09:25 PM   #9
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Quote:
Originally posted by killersti
i snapped the number one rod. I took it to the dealership, and the wouldnt cover it under warrenty because of abuse. The car had 10,698 miles on it. They said that my intake and blow off valve caused it. Then the procedide to tell me that if i wanted to prove them wrong to pay them to pull the engine apart. What should i do????????????
So are you sure that you broke a rod... like you can see it sticking out of the block or is that what they told you it was? I'm willing to bet it was a piston instead of a rod, unless it is obvious.
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Old 04-18-2004, 09:16 PM   #10
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I have run 500bhp for quite some time on a stock STI short block with out any problems.

If you are breaking the ring lands on the piston or loosing a rod bearing, It is because of poor tuning not poor parts.

If you snap a rod, that is because of to much cylinder pressure.

And yes, when the rod breaks, It pokes holes in every thing that it can reach.

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Old 04-18-2004, 09:37 PM   #11
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How many miles at 500bhp? What heads are you using? Its always nice to hear good numbers like that and still running.
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Old 04-18-2004, 10:06 PM   #12
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I do not know how many miles are on the motor because there is no odometer in this thing! What I can tell you is that it has been out to the desert eight to ten times for an average of three days per trip. The heads are off a 2.5 n/a motor, Twin cam style. It runs on 110 octane fuel at 20psi. It dose wheelies in fourth gear as easy as it dose in second gear. Bla-Bla-BLa.
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Old 04-18-2004, 10:28 PM   #13
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Oh, Nice. I was thinking it was a street car. LOL!
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Old 04-18-2004, 11:06 PM   #14
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awesome pic
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Old 04-18-2004, 11:38 PM   #15
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Quote:
Originally posted by supercompact
Oh, Nice. I was thinking it was a street car. LOL!
Well,,,,,,,,I drove it on the street once, dose that count?
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Old 04-30-2004, 04:07 PM   #16
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Quote:
Originally posted by Crawford Performance
Well,,,,,,,,I drove it on the street once, dose that count?


Close enough...
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Old 05-01-2004, 04:19 PM   #17
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Quirt... did you pop any wheelies on the street?? HAHA I bet the paddles dont hook too well on concrete though, LOL.
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Old 05-01-2004, 09:36 PM   #18
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Quote:
Originally posted by eightballrj
Quirt... did you pop any wheelies on the street?? HAHA I bet the paddles dont hook too well on concrete though, LOL.
First, Second, Third and Fourth gear wheelies to be exact

But not with the paddles. On the street, they make my teeth chatter and blurrrrrrrrr my vision.
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Old 05-02-2004, 02:54 AM   #19
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Quote:
On the street, they make my teeth chatter and blurrrrrrrrr my vision.
LOL

They probably also make a really annoying whappity whappity whappity sound too !!

If your beating out bearings due to poor tuning, does this engine tend to be more prone to killing a specific bearing?

Larry

Last edited by hotrod; 05-02-2004 at 03:24 AM.
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Old 05-02-2004, 03:38 AM   #20
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Quote:
Originally posted by hotrod
LOL

They probably also make a really annoying whappity whappity whappity sound too !!



Larry
Ya, its kidney killing fun... I remember going down a street on a quad a few times.... besides the pain it causes you the road kills thoes rather expencive tires real quickly.
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Old 05-02-2004, 12:00 PM   #21
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Quote:
Originally posted by hotrod
LOL

They probably also make a really annoying whappity whappity whappity sound too !!

If your beating out bearings due to poor tuning, does this engine tend to be more prone to killing a specific bearing?

Larry
I usually see #4 to be the first to go, followed by #1. This failure is usually caused by some other form of abuse, not just poor tuning.

I pulled down a motor last weed that detonated so hard, the wrist pin broke in half It just happened to be #4, but every piston in the motor was cracked.

Quirt Crawford
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Old 05-02-2004, 12:26 PM   #22
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Quote:
Originally posted by Crawford Performance
I pulled down a motor last weed that detonated so hard, the wrist pin broke in half It just happened to be #4, but every piston in the motor was cracked.
Wow... any chance of a pic of the broken wrist pin? I've NEVER thought anyone could break one of these Subaru wrist pins...
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Old 05-02-2004, 12:36 PM   #23
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Quote:
Originally posted by 8Complex
Wow... any chance of a pic of the broken wrist pin? I've NEVER thought anyone could break one of these Subaru wrist pins...
If Nick has not broke on yet, I call BS



JP
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Old 05-02-2004, 03:44 PM   #24
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Quote:
Originally posted by 8Complex
Wow... any chance of a pic of the broken wrist pin? I've NEVER thought anyone could break one of these Subaru wrist pins...
I got one even better than a broken Subaru part.
The broken parts that I am speaking of are from CP

When I get them back from CP, I will post the pictures for ya.

Quirt Crawford
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Old 05-02-2004, 03:47 PM   #25
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Ahhh, no wonder... Subaru piston pins are BEEFY. I bet CP lightened them a bit and made the walls more thin (a good idea, but not if they're made too thin).

Quote:
Originally posted by hondaslayer
If Nick has not broke on yet, I call BS
Ain't that the truth.
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