hay tell me what you think,

i want to build a performance engine to put in my brumby. ultimatly i would like a 500Kw EJ25 twin turbo but for now i want to build a performance N/A EA81 with the current motor i have to minamise fuss. this is what i have in mind. Boreing, stroking, full head porting and polishing, custom intake and exhaust manifolds, webber carb, titaunimun valves and heiver valve springs, stronger con rods and push rods. i'm hoping to get at least 120hp over the standard 60 - 70hp. so let me know what you think and im open to sugestions. and for thoese of you that are going to ask why an EA81 to thoes i say because i can and want to work on a push rod engine

Right on! I love the EA81 engine, it is highly durable, with careful building and tuning this should be quite possible, I would also reccommend balancing the engine, smooth power and a few more rpm's, keep us posted!!

save up a lot of money..... the people that I know that have done that same thing (about 150hp out of an ea81) spent big $$ to accomplish it.. not to mention a lot of accurate measuring and professional machining of parts... it would actually be cheaper and easier to cram an EJ22 out of a liberty wagon, and then you would have MPFI too! trust me.. i did the EJ22 swap on my previous 1980 GL wagon (look here! http://usmb.net/gallery/album292 )

Local advice: www.ausubaru.com

get ahold of the Hatch Patrol guys as they have built ea81 with spfi pistons for higher compression and such. dont know all the details about the buld but i have seen one example in person, they also used a turbo crosspipe and built up an exhaust from it, instead of using a y pipe

Thank for all your help this should all be very helpfull but maybe ratty is right and i should just do the EJ22 conversion but if i go that far i will be turboing it with a worked EJ25.

Ever heard of RAM engines, they make engines for small aeroplanes out of EA81's that output 140HP http://www.ramengines.com

 

This should give you some ideas of inspiration

Yeah i had a look at them the other day and i realy dont want to justify that sort of money plus id rathed do the engine build myself as a learning experince.

you dont need to worry about things like con rods. They will be just fine unless your planning on running at over 9000-10000 rpm.

 

As for boring, theres not much room for that.

 

I think if your going to the trouble of making custom inlet and exhausts, you should get some heads from sub4. They are twin spark and have non siamese ports. Not too expensive just for the heads, and they are a New Zealand company so not too far from you.

 

Would be a good project, the ea81 is certainly strong enough for much more power than it comes with.

thanks i'll have to look into that