can i install EA81 pistons in my ER27? if you know that they will work in the EA82, that's just as good since that has the same pistons as the ER27.

 

is there a good link to the specific differences between EA81 and EA82 blocks - like the pistons?

I have been told that pistons interchange. People often run EA71 pistons in their EA81 to bump up compression. I looked into that and it appeared from everything that I found that you can also interchange with EA82 pistons. Others know more about this and I'm sure they'll chime in soon.

from searches i've seen EA81 - EA71 comparisons or mention of EA82 pistons in EA81 blocks, but not lots of solid info on the other way around....using EA81 pistons in EA82 or ER27 blocks. i'm looking at aftermarket forged EA81 pistons i'd like to use in the ER27, they have valve reliefs cut into them as well.

 

i could look into aftermarket EA82 pistons - but i'm fairly set on these EA81 pistons unless i see some really solid feedback on something else.

 

thanks,

 

gary gross

moderator - http://www.xt6.net

1989 Subaru XT6 AWD Auto w/ High flow converter, dynomax muffler, locking center transfer clutch and rear LSD

1989 Subaru XT6 AWD Manual

i could look into aftermarket EA82 pistons - but i'm fairly set on these EA81 pistons unless i see some really solid feedback on something else.

 

Why are you so set on EA81 pistons? Just curious

well, since the ea81 is just a stroked ea71, the pistons for the ea71 give you more compression because of the location of the wrist pin. i dont know for sure, but the ea81, and ea82 pistons should be very close to the same.

 

spfi pistons give you 9.5 to 1 right... so if you used them in a er27, you should have more than 9.5 to 1?

isnt the er27 a little more compression than the ea82 spfi?

 

if the er27 run the same pistons as the carb/mpfi ea82, why wouldnt the spfi pistons be the ones you want to use?

I believe that the ER27 is only 8.5 or 8:1 not the full 9.5 like the Ea-82

know one knows for sure or where i can find out if they swap?

 

the XT6 uses the 9.5 compression ratio pistons (same as EA82), of this i am sure.

 

i want to use aftermarket EA81 pistons that are forged, 88 grams lighter than stock, with repositioned wrist pins for slightly higher compression. they have valve reliefs in them as well. don't know that i can find that combination in after market ER27 (or EA82) pistons. if there is a supplier of high quality after market forged pistons for ER27 pistons, let me know.

 

thanks and have fun

Give CCR a call, they should know for sure if the pistons swap and what it does with compression.

 

 

www.ccrengines.com

I did a lot of searching to try and find forged EA82T pistions and nobody had any thing not evin cast. so your best bet probably is the ea81 pistons but I have not explored the details my self as to the swapability.

SubaruBrat has forged pistons (I think) in the ER27 in his brat.. wonder where he got them..

anyone have subarubrat email address or point him to this thread?

i'll call CCR and post any good...er not so good, information,

 

thanks kids and have fun,

anyone have subarubrat email address or point him to this thread?

i'll call CCR and post any good...er not so good, information,

 

thanks kids and have fun,

Good luck Gary! You got PM at the other board.

 

the XT6 uses the 9.5 compression ratio pistons (same as EA82), of this i am sure.

 

thanks and have fun

i thought there were carb/mpfi pistons, spfi high compression pistons, and the turbo pistons. 3 different ea82 pistons, right?

i thought there were carb/mpfi pistons, spfi high compression pistons, and the turbo pistons. 3 different ea82 pistons, right?

correct. the ER27 pistons are the exact same as the EA82 spfi pistons.

I hate to contridict, but i'm almost positive that the XT-6 has lower compression then the EA-82

contradict away, i'm trying to track this down. the EA82 spfi motors use the exact same internals as the ER27. same pistons, rings, valves, springs....just more of them. the other EA82 motos, i don't know. but the different EA82 motors are beyond the scope of my question - i'm really wanting to know if the EA81 pistons fit in the ER27. since it's the same set up as the EA82 spfi, i figured that might help since people know more about the EA82 than the ER27. if one of the EA82 motors has different compression, it's likely the later model mpfi EA82 motors - but that's irrelevant to this thread.

 

CCR seemed to think the EA81 pistons would fit, but i don't know that they were 100 percent sure of that.