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-   -   Trying to identify is my engine ej255 or ej257 (https://www.scoobynet.com/drivetrain-11/1060129-trying-to-identify-is-my-engine-ej255-or-ej257.html)

Gavin Byrne 27 September 2019 01:28 AM
Trying to identify is my engine ej255 or ej257
 
Hi Guys new to the site just trying to ask the age old question trying to identify which is my car ej255 or Ej257 here are the codes I found on the head near the intake manifold on top was 07.. Underneath was LH(lefthand) b07 and on the far side underneath it was b02 any ideas

LewisScoob 27 September 2019 08:30 AM
Is the engine code not on the VIN plate?

Gavin Byrne 27 September 2019 09:12 AM
It is Lewis but engine was swapped out for a 2.5 with classic heads

Don Clark 27 September 2019 09:34 AM
Originally Posted by Gavin Byrne (Post 12062513)
It is Lewis but engine was swapped out for a 2.5 with classic heads
Most classics are 2.0L so asking about head casting marks doesn't seem to equate and the ancilliaries won't match.

The difference between EJ255 and EJ257 short blocks is in the internals and subsequent higher compression ratio due to different pistons. The bare block itself is the same.

Have you checked it has the EJ25 cast mark on the block?

Gavin Byrne 27 September 2019 09:45 AM
Cheers don any idea what compression ratio wrx vr sti... She is classic heads I have seen quite a few done this way tbh

LewisScoob 27 September 2019 09:50 AM
I spent the last 40mins trying to find out what Don just rattled off. :lol1:

I did find a thread stating that the EJ257 will have AB on both the casting halfs where they mate up, Is that right Don or are they the same P/N?

The EJ25 stamp Don refers to is circled red below and the AB stamp in the blue - if thats correct. I'll let Don confirm/deny it :)

https://cimg8.ibsrv.net/gimg/www.sco...bc810ac865.jpg

LewisScoob 27 September 2019 09:52 AM
Originally Posted by Gavin Byrne (Post 12062516)
Cheers don any idea what compression ratio wrx vr sti... She is classic heads I have seen quite a few done this way tbh
CR between the WRX and STI is different but that's a moot point because you're running 2.0 heads, not 2.5's.

I found this on NASIOC. The EJ255 in the WRX ran a slightly higher CR due to the different piston dish.

http://www.sponaugle.com/nasioc/Engi...urations-1.jpg

Gavin Byrne 27 September 2019 10:03 AM
I had to do the same Lewis 😂😂 I will check see what that stamp says on mine I'm doing compression test on it later on in the week so should get some sort of answer either way cheers lads

Don Clark 27 September 2019 10:19 AM
Originally Posted by LewisScoob (Post 12062517)
I spent the last 40mins trying to find out what Don just rattled off. :lol1:

I did find a thread stating that the EJ257 will have AB on both the casting halfs where they mate up, Is that right Don or are they the same P/N?

The EJ25 stamp Don refers to is circled red below and the AB stamp in the blue - if thats correct. I'll let Don confirm/deny it :)

https://cimg8.ibsrv.net/gimg/www.sco...bc810ac865.jpg[/QU
The stamp ringed in blue AFAIK only relates to the grade of pistons fitted (size wise) (Grade A /GradeB) from the factory. (and possible mains clearances)

EDIT: Bore size rather than piston grade.

http://www.teamscream.net/pics/RSTi/...%20markfsm.jpg


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