Welcome to Ultimate Subaru Message Board, my lurker friend!
|Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.
We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
* The joy of participation and being generally awesome constitutes winning
** Not an actual guarantee, but seriously, you probably won't regret it!
Serving the Subaru Community since May 18th, 1998!
SVX / STI Piston Swapping......
Posted 17 June 2003 - 08:05 PM
Posted 17 June 2003 - 10:13 PM
Posted 18 June 2003 - 06:16 AM
If you want to lower compression, just look for some aftermarket pistons or custom ones. I don't know enough about the differences between the svx motor and the sti one to know whether that would work or not, but it's probably likely you can find something if that's the route you want to go.
Posted 18 June 2003 - 09:08 AM
So find yourself a dealer with a Legacy parts book, order 6 Legacy 2.2 Turbo pistons and put them into an SVX engine.
BTW, the SVX uses the same injectors (according to my parts CD-ROM) as the n/a EJ22 engines. They're good for up to 250-260 hp (on 6-cylinder engines). If you want more power, use early EJ20 turbo (Legacy Turbo, Legacy TwinTurbo or Impreza WRX) side feed injectors. MY99 and after WRXs have top feed injectors which do not fit the pre MY99 fuel rails.
Posted 18 June 2003 - 11:25 AM
First, there is a difference between manual & auto trannys. Second the injector type in the 90-91 autos are definitely different then the 92-94 models. I can't tell you for sure whether the manuals had a similar change or not.
Posted 19 June 2003 - 02:02 AM
Posted 20 June 2003 - 10:09 AM
we are also thinking of putting ej22 heads on a sohc ej25 block. anyone tried this?
Posted 20 June 2003 - 11:34 AM
Posted 20 June 2003 - 08:10 PM
any one have an idea if the timing would still be right w/the different heads? cuz there are no adjustable timing gears for the subaru motors as far as we know.
Posted 23 June 2003 - 01:05 PM
Regarding compression ratio: the EJ25 engines that I have seen, all have dished pistons to reduce compression ratio, probably because the volume of the combustion chamber in the cylinder head is the same as with the normally aspirated EJ20 and EJ22 engines. However, I have no hard evidence of that.
Please be aware that (early) SOHC EJ22 heads have smaller valves than the EJ25 DOHC heads. I have no information on EJ25 SOHC heads at the moment.
Posted 24 June 2003 - 02:51 PM
Posted 24 June 2003 - 07:01 PM
Posted 25 June 2003 - 03:46 AM
Posted 25 June 2003 - 06:45 AM
EJ25 either has shorter rods or change on the crank. One of the two.
Posted 26 June 2003 - 12:04 AM
Posted 09 September 2009 - 06:09 PM
0 user(s) are reading this topic
0 members, 0 guests, 0 anonymous users