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 Post subject: Re: Sh fxt possible big end bearing failure
PostPosted: Fri Jan 04, 2019 9:36 am 
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Vehicle: MY09 XT

Posts: 39
Location: Canberra
Good luck!

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 Post subject: Re: Sh fxt possible big end bearing failure
PostPosted: Mon Jan 07, 2019 8:46 am 
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Vehicle: My09 XT premium

Posts: 13
Location: Traralgon
Took a video of car running briefly



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 Post subject: Re: Sh fxt possible big end bearing failure
PostPosted: Mon Jan 07, 2019 9:33 am 
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Vehicle: MY08 XT (SH)

Posts: 1378
Location: Brisbane
Wow, that's quite a loud knocking sound.

Did it start quiet then progress to that volume, or kick-off at full racket all of a sudden?


Also - cheers for sharing the details of all this on the forum. I know it's more fun to post details of kick-@rse mods, but this engine failure stuff is need-to-know for Subaru owners. :thumbs:

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 Post subject: Re: Sh fxt possible big end bearing failure
PostPosted: Mon Jan 07, 2019 9:40 am 
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Vehicle: My09 XT premium

Posts: 13
Location: Traralgon
It started soft and processed to this by the time I limped it home. Sitting at idle it's bad as you can here sitting on about 1500 rpm the sound is alot nicer.
Doing a call around today to get some quotes as most shops reopen today after the Christmas / new year break.

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 Post subject: Re: Sh fxt possible big end bearing failure
PostPosted: Tue Jan 08, 2019 8:32 am 
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I Say: What goes around comes around
Vehicle: MY12 S-Edition Forester

Posts: 228
Location: Old Reynella, SA
Wow!


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 Post subject: Re: Sh fxt possible big end bearing failure
PostPosted: Thu Jan 10, 2019 11:44 am 
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Vehicle: My09 XT premium

Posts: 13
Location: Traralgon
Just an update.

I have decided to go down the route of purchasing an Ej257 short block and having my local mechanic build that up.
This morning i ordered the short block and hope to see it by the end of January depending on shipping speeds from Adelaide to Melbourne.

One question i do have is regarding compression ratios...
from what i am reading and understanding the stock sh fxt is about 8.4:1 compression whereas with the EJ257 short block bolted up it will lift to to about 8.8:1
Is anyone having any issues running that little bit higher compression in an otherwise stock motor?
i plan on getting it tuned at gotitrex after about 1500km run in on the new short block.

cheers


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 Post subject: Re: Sh fxt possible big end bearing failure
PostPosted: Thu Jan 10, 2019 2:26 pm 
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Vehicle: MY08 XT (SH)

Posts: 1378
Location: Brisbane
MrRaySt wrote:
Just an update.

I have decided to go down the route of purchasing an Ej257 short block and having my local mechanic build that up.
...

One question i do have is regarding compression ratios...
from what i am reading and understanding the stock sh fxt is about 8.4:1 compression whereas with the EJ257 short block bolted up it will lift to to about 8.8:1
Is anyone having any issues running that little bit higher compression in an otherwise stock motor?
i plan on getting it tuned at gotitrex after about 1500km run in on the new short block.

cheers


Watching the answers to this question with great interest.

Assuming you're not switching to E85 fuel, in my estimation the answer is probably a combination of exclusively using 98 octane and having a quality tune to keep knock under control.

The result could be a car with plenty of power and responsiveness (off and on boost) in the fat part of the torque curve but limited in terms of running the kind of maximum boost levels (and peak power) that most people assume is ok for a stock block :dontknow:

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 Post subject: Re: Sh fxt possible big end bearing failure
PostPosted: Thu Jan 10, 2019 3:43 pm 
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I Say: There's no 'i' in Team, but there is in Winner!
Vehicle: MY10 XT

Posts: 1854
Location: Mealbun Orstraya
Just pick up the phone and call Aleck at GIR :ok:


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 Post subject: Re: Sh fxt possible big end bearing failure
PostPosted: Sat Jan 12, 2019 8:51 pm 
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Vehicle: MY08 XT (SH)

Posts: 1378
Location: Brisbane
Also, the budget option:-

https://www.carmodsaustralia.com.au/per ... billet-alu

Willall/IAG Stage X EJ25 Subaru Billet Aluminium Short Block $25,999.95

On the topic of compression ratios:-

"Compression Ratio:
•8.5:1 on D Cylinder Heads (EJ255)
•8.2:1 on B, V and W EJ257 Heads with standard thickness gasket."


This seems to indicate that the heads (stock forester or otherwise) contribute to final compression ratio.

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 Post subject: Re: Sh fxt possible big end bearing failure
PostPosted: Sat Jan 12, 2019 11:14 pm 
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I Say: Car mods are like OddBodz, you got to collect them all! -------------------------------------
Vehicle: MY05 STi swapped sled

Posts: 17845
Location: Spearwood Perth WA
Yowie wrote:
Also, the budget option:-

https://www.carmodsaustralia.com.au/per ... billet-alu

Willall/IAG Stage X EJ25 Subaru Billet Aluminium Short Block $25,999.95

On the topic of compression ratios:-

"Compression Ratio:
•8.5:1 on D Cylinder Heads (EJ255)
•8.2:1 on B, V and W EJ257 Heads with standard thickness gasket."


This seems to indicate that the heads (stock forester or otherwise) contribute to final compression ratio.

Yes. There are diffent combustion chamber volumes in Subaru cylinder heads.

In the EJ25s, STI usually has larger combustion chamber volume than WRX and Forester, Except for the 1st generation SG9 Forester which had the large combustion chamber heads like the STI.

The way to tell is to look at which cylinder heads you have. Eg : B25, D25, V25, W25 etc etc etc. It will be clearly visible on the casting.

B25 : has larger 55-56cc combustion chamber. It is used on 1st generation SG foresters. And 2.5L GD STi.

D25 : has smaller combustion 50-51cc chamber, and is used on 2nd generation SG forester onwards. Aswell as 2.5L WRX.

Then the there is V25, which is like B25, except has provision for secondary air injection.

Then there is W25, which is D-AVCS and is used on 3rd generation onwards STi.

As far as I know. ALL turbo 2.5L Foresters EXCEPT the 1st generation 03-05 SG have the small combustion chamber D25 heads.

It doesnt really make that much difference in a subaru engine re-build, as you will typically be using better pistons, and having the car tuned to suit. But it is something to consider if you are planning out the build.

You really need to look at the piston dish volume from the manufacturer, as different aftermarket piston manufacturers base thier pistons off different cylinder heads. And then spit out a estinated C/R. Which will be wrong if you are using the other type of cylinder head to what they base it off. But if you look at the piston dish volume, then calculate the ratio from there, then you will get a more accurate C/R. But there are many variables like head gasket thickness, and number of slices off the deck surface that will alter the numbers.

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