EA82 is 9.0 CR

ER27 is 9.5 CR

 

97 hp EA82 (@5,200 rpm)

145 hp ER27 (also @ 5,200 rpm)

interesting that both are 24 hp per cylinder, but different CR's.

 

where is that CR difference coming from? pistons/headgasket?

Correct me if i am wrong, but i believe the ea82 mpfi non turbo engine has a 9.5 compression, also

ea63- 8.5:1

ea71fe-10.0:1

ea71- 9.0:1

ea81t- 7.7:1

ea81- 8.7:1

carb ea82- 8.7:1

spfi ea82-9.5:1

mpfi ea82-9.0:1

ea82t 7.7:1

er27 9.0:1

ej22 9.5:1

 

Source subaru owners manuals 74-91

Sweet!. We should make a sticky, or post this in the USRM

thanks, that made me look it up again, silly rabbit.

 

1988 Subaru XT FSM lists MPFI EA82 and ER27 as 9.5:1

 

so that corrects/adds to his information above and answers the question about the misinformation I had to begin with.