Will ea81 pistons fit my ea82? I know the bore and stroke are the same for these engines, but what about wrist pin diameter and placement? are the 8.7:1 pistons notched for valve clearance? does anybody have any pics of them?

It'll work yes, I would recommend putting in new wrist pin bushings and getting them honed. Just dont throw any timing belts, It'll make a mess without the reliefs.

 

-Mike

Carbed EA81's and EA82's use the same pistons I am pretty sure. Except in 86 I think, the EA82 used the 8.7 to 1?

Carbed EA81's and EA82's use the same pistons I am pretty sure. Except in 86 I think, the EA82 used the 8.7 to 1?

 

Specs fro EA82 here list

Carbed 9.0,

SPFI,MPFI non-turbo 9.5.

Turbo 7.7

 

The EA81 carbed are 8.7? If they fit an EA82, and are at all sturdy, they might make good pistons for a turbo EA82. Is the wrist pin position relative to the deck the the same? Same length and diameter wrist pin?

The way I knew it was.

 

EA81 carbed: 9.0

EA81 dual carbed: 9.5

EA81 turbo: 7.7?

EA82 carbed 85, 87 and on: 9.0

EA82 carbed 86: 8.something

EA82 turbo: 7.7

EA82 SPFI: 9.5

 

I'll have to look in my manual.

EDIT: my US service manual does say 8.7 to 1 for the EA81. Interesting. I'll have to go out the the shed to check my Austrailan manual.

 

Ok.. My Australian Gregory's Service manual has this.

 

EA71: 9.0

EA81 79-80: 8.7

EA81 81-87: 9.2

EA82 85, 87 and on: 9.0

EA82 86: 8.7

This is carbed models only.

 

I guess it changed a fair bit around the world.