ej20 NA and Turbo eng internal differences??

[gtsoobie]

hi all

I recently acquired two ej20 engines one turbo and one NA .. and one 1992 legacy wagon.. The NA has spat out the big end bearing on #1 and half the piston skirt with it..and the turbo ..well its missing a few bits..
knowing the compression ratio is lower for the turbo I need to know which bits I can interchange to make up a working NA engine.. the car it's going in had an NA in it so I dont want to F%$# around converting it to turbo ( I already have a 92gt turbo 5 speed wagon) I am hoping the compression dif is in the heads, and not the pistons .. also is there any site which has info on engine tolerences?? I have the Haynes manual for a "Liberty" model (never heard of it in NZ!but the photo on the cover looks just like a legacy) and of all the 4 engines it covers it does not have my ej20DOHC..

Any help would be awesome
cheers
GWA

[ciper]

As long as you save the NA pistons and heads for the most part you will have an extra strong NA engine. You wouldnt want to create an NA engine using the low compression piston head combo and the turbo cams. It would be seriously dog slow. Imagine infinite turbo lag!

As far as specifics I think your best bet is to take the engines apart and just measure the two parts you plan to trade. For the most part subaru engines are interchangable, there are only a few spots whre you have trouble (like piston to head clearance when changing gaskets).

[gtsoobie]

So The pistons are different then?? cause #1 piston has lost half its skirt on the NA eng

[ciper]

Not knowing about this specific engines the turbo pistons usually have a larger bowl than the NA pistons. Sometimes the increased area is created with head volume.

Can you get an eye dropper and fill the pistons with motor oil and measure the dish between the two?