Jump to content


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*!
  • Say hello and join the conversation
  • Subscribe to topics and forums to get automatic updates
  • Get your own profile and make new friends
  • Classifieds with all sorts of Subaru goodies
  • Photo hosting in our gallery
  • Meet other cool people with cool cars
Seriously, what are you waiting for? Make your life more fulfilling and join today! You and your Subaru won't regret it, we guarantee** it.

* 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!

Guest Message by DevFuse
 

Photo
- - - - -

quick ea81toea82 swap question


  • Please log in to reply
17 replies to this topic

#1 archemitis

archemitis

    guy smiley

  • Members
  • 3,554 posts
  • the big minnie

Posted 17 October 2003 - 08:26 PM

ok... im bolting a ea82 to a ea81 tranny. a ea82 2wheel drive flywheel, with the clutch to match, will work right?

#2 XSNRG

XSNRG

    Elite Master of the Subaru

  • Members
  • 3,657 posts
  • Olympia

Posted 17 October 2003 - 08:35 PM

I'm pretty sure the clutches are the same diameter but the EA82 probably has a bigger input shaft.

#3 TomRhere

TomRhere

    Certified BRAT nut!!!

  • Members
  • 4,007 posts
  • Hillsdale, Mi. USA

Posted 18 October 2003 - 04:02 AM

You need the pilot bearing, clutch disk, and throw-out bearing for the tranny you're using. Flywheel and pressure plate for the engine you're using.

#4 subarubrat

subarubrat

    1000+ Super USER!

  • Members
  • 1,246 posts
  • Bealeton, VA

Posted 18 October 2003 - 05:33 AM

Exactly.

Get the 8 7/8 inch clutch disk for the EA81 21 spline. This will go between the EA82 flywheel and pressure plate. Watch out on the throw out bearing size. My bearing on the EA81 tranny could pass through the finger hole on the EA82 flywheel. I had to muck around autozone for a throw out bearing with a bigger surface area and the center size that would fit over the EA81 tranny. Just do a quick sanity check of the throw out bearing and pressure plate. :banana:

#5 archemitis

archemitis

    guy smiley

  • Members
  • 3,554 posts
  • the big minnie

Posted 18 October 2003 - 10:28 AM

and...
the splines on the ea81 tranny are the same as the splines on the 2wd ea82 tranny right?

i always thought the ea82 2wd tranny splines and clutch is the same as the ea81.

#6 TomRhere

TomRhere

    Certified BRAT nut!!!

  • Members
  • 4,007 posts
  • Hillsdale, Mi. USA

Posted 18 October 2003 - 02:58 PM

From what I understand, the spline count of the input shaft is different between the EA-81 and EA-82 trannys along with the collar that the throw-out bearing rides on. Plus the throw-out bearing not fitting the fingers of the pressure plate, like Scott mentioned. Add to that, the pilot bearing size difference.
Really thinking that's why the guy that swapped the EA-82 engine into the '82 BRAT I now own, used the EA-81 flywheel, and clutch assembly. He re-drilled the mounting bolt holes to fit the larger ones for the EA-82 engine crankshaft.
Main problem with doing that is, you lose the marks for timing the T-belts. Plus, the ignition timing marks are off a bit, I'm setting ignition timing by ear right now.
If you have both flywheels available, you could enlarge the bolt holes in the EA-81s, stack them atop each other, both facing the same way. Align the bolt holes to their proper postion. Then make your own marks on the EA-81 flywheel, for T-belt and ignition.
Then,
,
,
,
You could send me that un-needed EA-82 flywheel so that I can do my 5 speed swap. Yes/No, maybe so?!?! Just asking is all.

#7 archemitis

archemitis

    guy smiley

  • Members
  • 3,554 posts
  • the big minnie

Posted 18 October 2003 - 03:11 PM

WELL, i know for a fact that the 2wd ea82 clutch disc will not fit on the splines of a 4wd ea82 tranny.

so are there three different tranny splines, or two? im sure i'll find out tomorrow, when i get the ea81 engine out of the car. i am just wondering if i should go pull a two wheel drive engine just for a flywheel i may or may not use.

#8 subarubrat

subarubrat

    1000+ Super USER!

  • Members
  • 1,246 posts
  • Bealeton, VA

Posted 18 October 2003 - 04:10 PM

There are two spline types and two clutch sizes to contend with in this swap (discussing only 4WD components).

The two splines are 21 and 24 being EA81 and EA82 respectively.

The two clutch sizes are 7 7/8 and 8 7/8 and they are spread all over the place.

My combo is as follows:

ER27 engine (exact same as a EA82 as far as splines and mating etc.

EA81 4 spd tranny which has a 21 spline input shaft

EA82 flywheel and pressure plate which have a 8 7/8 design

EA81 clutch disk with a 21 spline hub

Throw out bearing with EA81 sleeve size and EA82 outer size

#9 archemitis

archemitis

    guy smiley

  • Members
  • 3,554 posts
  • the big minnie

Posted 18 October 2003 - 08:23 PM

"EA82 flywheel and pressure plate which have a 8 7/8 design

EA81 clutch disk with a 21 spline hub" quote thingy


so i need a 4wd ea82 flywheel?

and the ea81 has an 8 7/8 clutch disc?

ug... thanks for all your help guys!

#10 subarubrat

subarubrat

    1000+ Super USER!

  • Members
  • 1,246 posts
  • Bealeton, VA

Posted 18 October 2003 - 09:01 PM

Yes, the EA81 comes with both sizes, so when you order make sure you select the 8 7/8 one so it will match the 8 7/8 surface on the EA82 flywheel.

#11 myossfeece

myossfeece

    USMB is life!

  • Members
  • 231 posts
  • UPinAsubaruRX, INDIANA

Posted 19 October 2003 - 03:13 AM

I recently had a 1981 gl-f ea81 2wd and decided to go with the ea82 motor. I had to drill the flywheel bolt holes on the ea81 flywheel to use the ea82 flywheel bolts.(they are bigger) the flywheel kept the 2wd's clutch and pressure plate.
other than the flywheel it basicaly fell into the car with NO MODS. I left the disty out to get the motor around the brake mastercylinder. Pretty much the same setup as tom's brat.

#12 MilesFox

MilesFox

    Catch this Fox!

  • Members
  • 10,571 posts
  • Madison/Milwaukee, WI

Posted 19 October 2003 - 04:14 AM

yeah, i helped

#13 archemitis

archemitis

    guy smiley

  • Members
  • 3,554 posts
  • the big minnie

Posted 19 October 2003 - 08:45 AM

i like the idea of using the ea82 flywheel better, since theres no drilling and you retain you timing marks.

#14 archemitis

archemitis

    guy smiley

  • Members
  • 3,554 posts
  • the big minnie

Posted 24 October 2003 - 07:44 PM

lets asume that some people/companies on the internet are retarded.
would a sure fire way to get an 8 7/8 clutch disc be to order a turbo brat clutch?

#15 VaporTrail

VaporTrail

    Brattitude Adjustment

  • Administrator
  • 11,160 posts
  • Central Iowa

Posted 25 October 2003 - 12:45 AM

Scott,
do you still have the '82 tranny in yours? there are 2 different ea81 D/R trannies. the 81-82 had the 7 7/8 clutch, smaller flywheel, and smaller throwout bearing. when my tranny went out on my 82 wagon, I put in an '83 tranny. starting in '83, the throwout bearing has a bigger diameter, and a bigger clutch 8 7/8, and a bigger holder.... the shaft the holder rides on is larger as well, so an '82 bearing holder won't work on the 83+ tranny...

luckily I had a spare '83 flywheel to go with the tranny.

#16 subarubrat

subarubrat

    1000+ Super USER!

  • Members
  • 1,246 posts
  • Bealeton, VA

Posted 25 October 2003 - 06:27 AM

The tranny in it right now is from an 87. But it is a simple issue to find a throwout bearing with the right ID and OD sizes.

#17 MilesFox

MilesFox

    Catch this Fox!

  • Members
  • 10,571 posts
  • Madison/Milwaukee, WI

Posted 25 October 2003 - 10:13 AM

how about using a flywheel from an ea82 2wd? i believe the ea82 and ea81 used the same 2wd transmission.

#18 archemitis

archemitis

    guy smiley

  • Members
  • 3,554 posts
  • the big minnie

Posted 26 October 2003 - 05:22 PM

ok, i like the idea of the marks, but the ea81 flywheel is alot lighter than my ea82 flywheels.

and for some reason the 4x xt i got the motor out of, had a 7 7/8 clutch.

i figure i'll punch the flywheel since my timing belts are right on.




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users