Bore and sleeve - Page 4

svxsubaru1 · #46 12-21-2004, 01:32 PM

Just called up a dealer and got the part numbers for the pistons, theses are standard size pistons, not over bored ones.

Ej22t
left side Right side
12018AA340 12013AA340
12018AA350 12013AA350
12018AA360 12013AA360

EG33
left side Right side
12018AA490 12013AA490
12018AA500 12013AA500
12018AA510 12013AA510

EJ22 90-94
Left side Right side
12018AA231 12013AA231

EJ22 97
12006AA420 All the pistons are the same left and right.

EJ22 98-99
12006AA490 All the pistons are the same left and right.

All the part numbers for the ej22t, Ej22 and eg33 are diffrent.

mohrds · #47 12-21-2004, 02:14 PM

Quote:

Originally posted by svxsubaru1
Just called up a dealer and got the part numbers for the pistons, theses are standard size pistons, not over bored ones.

Ej22t
left side Right side
12018AA340 12013AA340
12018AA350 12013AA350
12018AA360 12013AA360

EG33
left side Right side
12018AA490 12013AA490
12018AA500 12013AA500
12018AA510 12013AA510

Very interesting. The ej22t and the eg33 each have six different pistons. There may be some truth to the interchangeability rumors.

They both list on subaruparts.com as $61.14 each.

All right, who has a micrometer and $130 to spend on some R&D???

SVXer95 · #48 12-21-2004, 02:27 PM

Quote:

Originally posted by mohrds

Very interesting. The ej22t and the eg33 each have six different pistons. There may be some truth to the interchangeability rumors.

They both list on subaruparts.com as $61.14 each.

All right, who has a micrometer and $130 to spend on some R&D???

I would imagine that the 6 different pistons is accounted for by the bore size matching subaru did to ensure tight tolerances and smooth running....

I don't see how the numbers really tell us anything

svxsubaru1 · #49 12-21-2004, 03:18 PM

Quote:

Originally posted by SVXer95

I would imagine that the 6 different pistons is accounted for by the bore size matching subaru did to ensure tight tolerances and smooth running....

I don't see how the numbers really tell us anything

I think your right, I think there for a more percisley built enigne in terms of weight also, maybe the rods were harder to machine to a cetain weight so they balence it out with slightley heavier/lighter piston. I specificley asked for pistons that werer not for over boarded engines, when i asked for the part numbers.

mohrds · #50 12-21-2004, 03:18 PM

Quote:

Originally posted by SVXer95
I don't see how the numbers really tell us anything

It was more of a "it wasn't shot down yet". If the ej22t would have had the same piston for all banks, then it for sure wouldn't fit the eg33.

This might kill the thought. The ej22t has a 9.69 cm bore according to http://wac.addr.com/auto/obs/turbo/ejcalcs.html
The SVX has a bore of 9.999 cm.

That would lead me to believe they are not compatible.

Doug

SVXer95 · #51 12-21-2004, 03:25 PM

Quote:

Originally posted by svxsubaru1

I think your right, I think there for a more percisley built enigne in terms of weight also, maybe the rods were harder to machine to a cetain weight so they balence it out with slightley heavier/lighter piston. I specificley asked for pistons that werer not for over boarded engines, when i asked for the part numbers.

Yeah, this is what I was talking about:
http://www.subaru-svx.net/forum/show...bore+tolerance

SVXer95 · #52 12-21-2004, 03:26 PM

Quote:

Originally posted by mohrds

It was more of a "it wasn't shot down yet". If the ej22t would have had the same piston for all banks, then it for sure wouldn't fit the eg33.

This might kill the thought. The ej22t has a 9.69 cm bore according to http://wac.addr.com/auto/obs/turbo/ejcalcs.html
The SVX has a bore of 9.999 cm.

That would lead me to believe they are not compatible.

Doug

Now that definitely puts a damper on things....

oab_au · #53 12-21-2004, 03:48 PM

Quote:

Originally posted by mohrds

It was more of a "it wasn't shot down yet". If the ej22t would have had the same piston for all banks, then it for sure wouldn't fit the eg33.

This might kill the thought. The ej22t has a 9.69 cm bore according to http://wac.addr.com/auto/obs/turbo/ejcalcs.html
The SVX has a bore of 9.999 cm.

That would lead me to believe they are not compatible.

Doug

Don't know about that Doug, my WSM has the bore at 96.9mm,with a stroke of 75mm.

Harvey.

oab_au · #54 12-21-2004, 04:56 PM

Been having a look at the site that you put up Doug. It shows the MY90.2.2, and the MY91,2.2T specs. The cylinder head volume is the same for both, but the piston volume is different, to give the different compression ratio.
So it looks like the pistons are different and are the cause of the lower ratio. Would do the same for the Svx.

The other point is the pistons that are different on each side, is because they use a offset little end pin to reduce piston slap.

Harvey.

mohrds · #55 12-21-2004, 05:13 PM

Quote:

Originally posted by oab_au

Don't know about that Doug, my WSM has the bore at 96.9mm,with a stroke of 75mm.

Harvey.

Interesting...

mohrds · #56 12-21-2004, 05:26 PM

Quote:

Originally posted by oab_au
Been having a look at the site that you put up Doug. It shows the MY90.2.2, and the MY91,2.2T specs. The cylinder head volume is the same for both, but the piston volume is different, to give the different compression ratio.
So it looks like the pistons are different and are the cause of the lower ratio. Would do the same for the Svx.

The other point is the pistons that are different on each side, is because they use a offset little end pin to reduce piston slap.

Harvey.

Now I want to know what the piston volume is on the SVX

According to Wayne, the piston volume on the ej22t is 28cc in volume compared to the 14cc for the ej22.

If we were to guess the SVX pistons were 14cc, that would also lower our compression to 8.0:1

The more I look, the more it appears that the EG33 is a MY90 EJ22 design with two extra cylinders, new DOHC heads and intake.

Doug

drivemusicnow · #57 12-21-2004, 05:29 PM

yeah.. i was pretty sure it as 9.69 for the SVX...
porsche 911 turbo is 9.999 though

maybe it was just wishful thinking.

if we already have forged crank and rods, i believe with a bit of machining these pistons would work. but i do think it will come down to someone trying.

Does anyone know the head volume vs piston volume with from the eg33, ej22, and the ej22t??? this would be mighty helpful

oab_au · #58 12-21-2004, 05:46 PM

Working with the figures posted, the ej2.2 has a clearence volume of 65.7cc to give a ratio of 9.4:1

Working backwards the SVX has a clearence volume of 61cc to give a ratio of 10:1. So if the ej2.2t pistons were fitted ,it wound bring it down to 8.6:1.

Looks good guys

Harvey.

SilverSpear · #59 12-22-2004, 12:58 AM

Quote:

Originally posted by SVXer95

I would imagine that the 6 different pistons is accounted for by the bore size matching subaru did to ensure tight tolerances and smooth running....

I don't see how the numbers really tell us anything

I double that!!! they do not tell us much.
of course they have different numbers, at the end it is a legacy engine and an SVX engine with different specifications, but the bore size is what counts!!!!

SilverSpear · #60 12-22-2004, 01:17 AM

guys why are you all focusing on subaru pistons?? can't we dig up larger bores pistons from other manufacturers? Mitsubishi? Ford?..... the SVX bore as said is 9.99 cm in bore whereas the highest bore of another subaru turbo is 9.96 cm.
I prefer finding a 10 cm or 10.1 cm bore to fit our car, because when dismantling the engine some of you will get surprised to find that they are having some gaps in their piston chambers... so you will need either to fill it or better shave it a little bit to smoothen up and put higher bore pistons...