mikec03 Posted April 19, 2011 Share Posted April 19, 2011 I was going by the following quote from Wiki: "Beginning in the 1997 Model Year, the 2.2 liter engine for 1997 Legacy and Impreza models has had internal and external changes that yield an approximately 10% increase in power and 3% increase in fuel economy. Accomplishing this involves many factors........ Compression ratio has been increased to 9.7 to 1 by reshaping the crown of the piston. This eliminates the clearance that was available between the piston at TDC and the fully opened valve." Link to comment Share on other sites More sharing options...
johnceggleston Posted April 19, 2011 Share Posted April 19, 2011 ....... Compression ratio has been increased to 9.7 to 1 by reshaping the crown of the piston. This eliminates the clearance that was available between the piston at TDC and the fully opened valve." Maybe some are not aware that the top of the piston should be domed if it is a interference piston. I hope that subaru replies to ocei77, but I doubt that they will. i think the ''the crown of the piston'' refers to the top of it, not the shape of it. Link to comment Share on other sites More sharing options...
mulefoot Posted April 20, 2011 Author Share Posted April 20, 2011 Sorry for not responding sooner but I lost my internet after some strong winds (one of the perils of having satellite internet). I didn't mean for this to turn into a full scale debate but I did find all of the comments interesting. The mechanic that had the car didn't want to do anything with it so I brought it home to play with. I will try to slap on a timing belt and if that doesn't work I will take a look at the valves. I figure it can't be much harder than splitting a 100 hp tractor to replace the clutch and work on the transmission... Thanks again to all who responded to the post! Link to comment Share on other sites More sharing options...
idosubaru Posted April 20, 2011 Share Posted April 20, 2011 yeah if you're okay with doing a clutch replacement, a valve replacement isn't really that big of a deal on one of these. you don't even "have" to pull the motor on this one. you could even just buy a good head from someone and swap heads. that's probably what i would do given the almost unheard of failure rates of EJ22 components in the heads. adjust the valves before you install and you're golden. i even have a 1997 EJ22 i might be convinced to pull the head off of. perfectly good motor i pulled out of a wreck that i got from someone i knew. be sure to use a Subaru head gasket on these. aftermarket gaskets have no faired well on EJ25's and since they're so similar to EJ22's i would not chance aftermarket gaskets on EJ engines. EJ25's and EJ22's have many shared components, the heads and short blocks are even interchangeable they're so similar - you bolt EJ22 heads to EJ25 block and the other way around). Link to comment Share on other sites More sharing options...
Fairtax4me Posted April 20, 2011 Share Posted April 20, 2011 The mechanic that had the car didn't want to do anything with it so I brought it home to play with. I will try to slap on a timing belt and if that doesn't work I will take a look at the valves. I figure it can't be much harder than splitting a 100 hp tractor to replace the clutch and work on the transmission... Thanks again to all who responded to the post! If it runs rough, you can pull injector plugs one at a time to see which cylinder/s are not firing. Or I suppose you could just do a compression test on it. (if you have a gauge) Link to comment Share on other sites More sharing options...
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