ECUtune Stage III development

[Hocrest]

Originally Posted by longassname

the hydraulic lash adjusters are expensive and we have 24 of them. $35 * 24 = $840

I'm not sure if they have them to fit the EG33 but folks that have used them in their EA82's and ER27's have been very satisfied.

Cheap HLA's

[longassname]

Originally Posted by Electrophil

And I have one clattering... Can you "replace just one" or is this a all or nothing thing?

Well I doubt you're going to take your engine apart to replace one. My question is what is the difference between the svx lash adjusters and the lash adjusters for the other dual over head cam subarus? The lash adjusters for some of the other models go as cheap as $15.

[longassname]

Originally Posted by Hocrest

I'm not sure if they have them to fit the EG33 but folks that have used them in their EA82's and ER27's have been very satisfied.

Cheap HLA's

good link, thanks

$4 rebuilts sound like a good idea

[longassname]

all of you, good links

That's a plethora of information

I myself enjoy reading this stuff, just for the fact that i'm learing so much too.

[longassname]

Can we get a link to that discussion here?

The bore and stroke are the same 96.9 x 75 for all 3 engines
The per cyllinder displacement is the same for all 3 engines

The compression ratio is 9.5 for the na 2.2 and 8.0 for the turbo.
The pistons are different between the turbo and na
The heads are different between the turbo and na

How was the legacy piston debate ended without knowing the volume of the combustion chambers? With the heads being different I would think you would need that info or to have the pistons in hand to measure them.

Originally Posted by NeedForSpeed

Michael,

I believe that someone posted pictures of the 2.2L piston tops. There has been much discussion of 2.2 pistons, and I believe all debate was settled once and for all. I believe Harvey discussed the probable compression ratio using 2.2L pistons. My feeling is that the combustion chambers are of the same volume.

I have seen 2.2L pistons, and they have a significant dish, such that no valve reliefs are necessary. The SVX pistons have a bulge. Definately, 2.2L pistons will drop the compression ratio. 2.2L pistons are an alternative piston for use in the SVX supercharged engine.

I have two core engines, well, most of two core engines, but not handy. I have access to an automachine shop. If you keep me in the loop, that may benefit us all.

The shop belonged to my dad. I did engine machine work and engine assembly to earn spending money while in high school and to make dollars for college. That was a long time ago.

I also plan to build an engine for supercharging.

Please tell me what the octane rating is for premium in Florida.

Thanks

[SVXtasy]

This is all very good info I have a lot of reading to do... keep it up guys it is nice to see a thread with real info on it here in the SVX forums.

[NeedForSpeed]

I don't believe that the heads are different between the 2.2L NA and Turbo.
I can't say for sure, but I believe all three heads have the same chamber size. The SOHC and DOHC have very similar cc, so I can't see Subaru offering different chambers for DOHC engines. Too costly. The pistons also reflect that the chambers are probably nearly identical in volume.

The NA 2.2L pistons probably look more like the SVX piston, four reliefs and flat, than the turbo piston. The bottom line is that the SVX chamber size is fixed, the SVX piston has four reliefs and a bulge while the 2.2L Turbo piston has a deep dish. The compression ratio is going down with these pistons!

The debate never ends, just different people are new to the 'debate'. The latest discussion seemed recent, this year maybe. Maybe in the Turbo thread? Do a search on Harvey's posts, you should find it easily enough. Compression ratios are estimated, and I believe close estimations.

Originally Posted by longassname

Can we get a link to that discussion here?

The bore and stroke are the same 96.9 x 75 for all 3 engines
The per cyllinder displacement is the same for all 3 engines

The compression ratio is 9.5 for the na 2.2 and 8.0 for the turbo.
The pistons are different between the turbo and na
The heads are different between the turbo and na

How was the legacy piston debate ended without knowing the volume of the combustion chambers? With the heads being different I would think you would need that info or to have the pistons in hand to measure them.

[svxsubaru1]

Over on the legacy board i read a post saying that the only difference between the NA head and the turbo head was the cam that came in it.

[NeedForSpeed]

That I believe

Originally Posted by svxsubaru1

Over on the legacy board i read a post saying that the only difference between the NA head and the turbo head was the cam that came in it.

[TomsSVX]

cams have the same specs on my mitchell cd. Infact they don't list a non turbo or turbo so from that I assume they are the same for all 2.2l. I have only one concern with the pistons. Our engines are not like chevy small blocks, the pistons are made to fit. Not all the pistons are exactly the same diameter. The svx has gradings A B and C where as the 2.2lt only has A and B. This would be my only concern as with swapping off to the 2.2l pistons. Anyone have information that would negate my worries? If so be more than adimate as to put my concerns to rest. I remember going over this in a previous thread but cannot remember the solution.

Tom

[longassname]

According to both the factory service manual and the parts breakout from the above links the heads are in fact different for the na and turbo 2.2. That doesn't mean the combustion chambers are different--just means they could be.

Their combustion chamber shape definitely is different than ours because their spark plug is in a different place unless I missread the picture, not that that has any genuine relevance to the volume question.

Anyway we need to sort this out with factual #'s I can enter into an egine simulator. Of course I have nothing against the visual inspection and any previous talk. I'll see if I can find the thread and link it. If someone else can, please go ahead and put the link straight to the relevant info here.

[longassname]

Actually, the cams are different between the 2.2 turbo and na. See the factory service manual above. That means nothing to us though.

Piston sizes: They have all the same sizes. A B C and oversizes for rebore 10 and 20 over and all are available. Even if they didn't you could just rebore to fit the next largest. You don't use different size pistons hodge podge. The block and the pistons are labeled for which of the standard sizes they are..a, b, or c. When you rebuild the engine you take measurements inside of all of the cyllinders to see if they are true and if they aren't you overbore the minimum amount necessary to make them true...if 20 thousands over isn't enough to make them true you scrap the block. If you read through the engine service section of the factory service manual it describes the process...good info for those not familiar with machine shop work. So anyway, you do the machine work on the block first then order the appropriate set of pistons and rings to match your machine work which may or may not be the same size as what you had originally.

Originally Posted by tomssvx

cams have the same specs on my mitchell cd. Infact they don't list a non turbo or turbo so from that I assume they are the same for all 2.2l. I have only one concern with the pistons. Our engines are not like chevy small blocks, the pistons are made to fit. Not all the pistons are exactly the same diameter. The svx has gradings A B and C where as the 2.2lt only has A and B. This would be my only concern as with swapping off to the 2.2l pistons. Anyone have information that would negate my worries? If so be more than adimate as to put my concerns to rest. I remember going over this in a previous thread but cannot remember the solution.

Tom

[TomsSVX]

thnx for the info. I guess I was putting 2 and 2 together a little too much rather than reading more in depth.

Tom

[longassname]

try to get me that manifold and fuel lines soon; we will need them very shortly here.

Another shout out to anyone with an extra manifold and hard fuel lines. I need them. If you have them let me know please.