ok, i've been lookin to get an xt6 for offroading purposes..... now, i was wondering if you could do a piston swap from an ea82 to get higher compression......... i have heard that the two motors are basically the smae, just one has two more cylinders.............i was just thinking on it, thought it would be an easy way to get a whole heck of a lot more power, and for cheap too.........

Contact CCR, they can get a piston for the compression you need. Paeco can as well and in any shape you want but beware you may move into an interferance engine schema.

The ER is already at the top of the compression line as far as the EA motors are concerned. If you go any higher your talking 10:1 plus, and it does turn into an interference good for power, bad if a T-belt goes. If you really want to raise the compression, without a whole lotta work, then 5psi will do that for ya, and an IHI RHB5 will more than put out enough, least with the stock compression ratio.. . . . these are things I've thought of many times already.

ok, i've been lookin to get an xt6 for offroading purposes..... now, i was wondering if you could do a piston swap from an ea82 to get higher compression......... i have heard that the two motors are basically the smae, just one has two more cylinders.............i was just thinking on it, thought it would be an easy way to get a whole heck of a lot more power, and for cheap too.........

Contact Paul Singer in the Yahoo XT6 forum. His XT6 is supercharged. I figured a supercharged XT6 would be great for off-roading purposes.

ok, i remember reading in the fix all book, that the xt6 has the 7.7:1 pistons, not the 9.5:1 pistons, that is the whole reason why i was looking into doing this, because it would be easy, and the parts are easy to find....... i could be wrong, but if i were to use the 9.5:1 pistons, it would not be an interference motor, because it has the same insides that an ea82 has....... right? im kinda lookin at keepin it naturaly aspirated, i dont want to go into turbo or superchargers yet because that requires a lot more work than what i have time and money for......

That was most likely an XT turbo with 7.7:1, as the turbo motors are the only ones with that low of compression, even the old EA81's had a little over 8:1. I'm almost definate that all the MPFI(non-turbo) engines had at least 9:1 compression, but I think that the SPFI and er27 had 9.5:1.

I am running a piston with a slight dome and a smooth surface. With the cam belt off and rotating the engine by hand I can get the valve stem to bump back against the cam follower by just the smallest ammount on the first rotation (valve set to full open) and nothing after that. I think I would be OK if I lost a timing belt but I am not interested in testing it. In the end, I am not facing any more risk than any other interferance engine such as my EJ25.

 

You dance, you pay the piper.

ok, i remember reading in the fix all book, that the xt6 has the 7.7:1 pistons, not the 9.5:1 pistons, that is the whole reason why i was looking into doing this,

That's incorrect! A typo perhaps. I do remember reading the same thing myself either online or in a Chiltons (or like) service manual. The FSM (Factory Service Manual) states the compression ratio for the XT6 is 9.5:1.

 

On the good side, I've read online that it's a closed deck engine, which really surprises me.