What to do with those heads ?

[morgie]

According to your experience, what would be the best to do with the ej22T between :

1 - Port & Polish + BluePrinting

2 - Planing the heads to try to get a 8.5:1 CR (or close to.. dont know if it possible without going to "far")? (like a wrx ej20t)

thanx for your advices !

[morgie]

or is the best is to do nothing on them, and use a bit more PSI with some upgraded injectors ?

[Brat4by4]

Port and polish is a super-high horsepower last effort trick to squeeze the last bit of horsepower out of a certain setup. Go for increased displacement or the ability to handle more boost. A mild port and polishing is fine if done cheaply. Don't screw with the compression. I've never heard of any monster EJ engines doing this and wouldn't think it a good idea.

Look into a 2.5 crank, stronger connecting rods, custom forged pistons. Increasing the displacement and boost will get you light years ahead of P&P or increased compression. Increasing the displacement will get you more off-boost power if that is what you are looking for.

[morgie]

Yup that's one of major point.

off boost power. And also, less boost for more power, as we all know that 12psi in a 8:1 CR engine produces less power than 12psi in a 9:1 CR engine. (effective pressure).

I'll do searchs on the forum for that crankshaft swap.. i know we've already talked about that. it gives 2.6l if i remember ?

[Legacy777]

I would tend to dissagree with the port and polish comment.

I think that would make a difference, especially considering that our valving is smaller then the EJ25's and probably the ej20t heads overseas that you would want to swap them for.

You can run more boost, but if the heads don't flow well, you are just making the rest of your intake system that less effecient.

Two guys I suggest talking to is Rod Grosevnor and Larry Witherspoon.

Larry's been up the head route with the EJ25 heads and looking at that option. He eventually scrapped that idea due to differences in the ej22t heads. Rod is basically building an ej22t motor up, and has pretty significant headwork done.

Rod is sometimes on the board, but not too much since starting his new job. Larry is not on the board, but on the bc-bf list.

Rod's email is subiedo@comcast.net
Larry's is ssspoon@aol.com

Email them and ask them about their setup or what they've learned.

And if you get a response, reply back to the group so the rest of us can learn.

[morgie]

Thanx Legacy777, i'll write to them asap.

My big Concern about this modification is ... Are the ej25 con rods as strong as the ej22T ones ?

I don't want to swap them and have them broke and destroy my engine block ... that would be very bad.

I might consider having some custom Forged Conrods built to the spec of the ej25 ones (depend on the price, do you know of any company presently building forged ej25 conrods ?? ), to make sure i wont destroy my engine if i want to push 16-17psi (+++ ?) on it...

[DOA]

Porting the heads is ALWAYS a good idea be the car N/A or turbo but its an expensive job when done properly (think of the price of doing it AND all the bolts, gaskets and so on you have to replace) but if you want to do it then dont skim the head for higher compression as youll probably hole a piston pretty smartish. As far as I know when most turbo engines are tuned most peeps reduce the compression to allow them to use more boost without detonation and pinking, you can do this when you port the head by getting thicker competition head gaskets (and they ARE expensive). If your gonna do the porting then it is a good idea to get some lower compression gaskets so you dont have to strip the heads later to fit em.

[970subaru]

Ok, having ported a few heads myself,(albeit not subaru, a 16v VW) Id say that a mild port can be done by you for the cost of dremel bits. Id try to get a identical head with a crack in it from the JY and cut it across the port to see how much material you can remove. If you really want to go that far. I just knocked down any casting marks, and smoothed the bottom of the port slightly(this is what is in the way of the air). you can narrow the valve seal support too if you want. just visualize what is in the way of the air and go VERY slowly. polish the exhaust to a mirror but leave the intake a little rough. exhaust you just want it out of there, intake the roughness makes turbulence to atomize the fuel better. I think if you decide to port youll have fun. I sure did. just go slow, be consistent between the ports(you dont want one flowing better than another) and dont mess with the CR at all. thats muvh more complicated. wait till you get done porting to have a valve jopb, and BE CAREFUL around the valve seats. sorry for the long ass post.