Are there any simple piston swaps other than the EA71 into EA81?, like for an EA82 maybe?

I've considered using the EA82 SPFI pistons, or maybe the carb pistons. The carb ones are 9.0:1, and the SPFI are 9.5:1. Start milling the heads, and things get complicated.

 

The SPFI ones might actually be too much with milled heads and such. Near as I can figure, with milled heads and EA71 pistons I'll be running close to 9.5:1 anyway.

 

All things considered, I no longer consider the EA71 pistons to be much of an "upgrade". The compression increase is extremely slight. They are about .020" taller than the EA81 pistons. The downside is the ring lands are thinner. I'm not planning any forced unduction for this engine I'm building, and I've already got the pistons and rings so I'm going to use them. Next time I'll probably try out the SPFI or EA82 carb pistons, but this round it's too late to change the plan now.

 

GD

Don't carbed EA82 blocks use the same pistons as carbed EA81 blocks? So wouldn't the EA71 pistons fit in the EA82? That's how I've heard it.

RAM engines (http://www.ramperformance.com) sells high compression pistons for EA81, EA82 and ER27 engines. someone at xt6.net has them in his ER27. he has pictures of them and details of his engine rebuild at http://www.xt6.net if you'd like to see it.

Don't carbed EA82 blocks use the same pistons as carbed EA81 blocks? So wouldn't the EA71 pistons fit in the EA82? That's how I've heard it.

 

No - carbed EA81's are 8.7:1 compression, and carbed EA82's are 9.0:1 compression.

 

GD

Ive seen an Xt fsm and is says that the JDM MPFI XT got 10:1 compression.

 

So EA81 carb pistons were 8.7:1 were they??? So they would be ok in a turbo EA82 block?