Finally decided on an engine configuration. originally thought i would just copy the 2.3 setup in my evo1. but decided a really smooth idle and smaller displacement for better gas mileage might be more important. so i was leaning toward just a high compression 2.0 for a couple months. ultimately decided on a 2186 using:
OEM 93mm 4d68 crankshaft. 86.5mm wiseco assymetric pistons and generic 147mm rods. the rods caught my eye on ebay. these aftermarket eagle copies are finally getting beefier. more meat in all the critical areas. and the 147mm length allows choosing any aftermarket 2.0 piston for use with 93/94mm stroke crankshaft. the pistons are 9.0 for evo 8, but will be about 9.3 in this motor. just what i am looking for to get good mileage and have crisp off the line feel. and no need to run big boost, rod ratio ends up at 1.56. same as a long rod 2.3 engine which is so popular these days. will rev to 9000 safely and squirt around quiet nicely on 25psi.
I also pickup up new OEM 2g manifold off ebay. it came in but was actually evo 3 manifold cut for 16g. I wanted a new manifold so i could machine a seat into the manifold to bolt the turbine housing directly to bottom of manifold. the wastegate will be mounted on top of manifold in between runners 2 and 3. I figure venting the two shorted runners will help equalize heat between the four runners. I also pickup up a second 6758 just to get the compressor cover. I dont want to run an aftermarket BOV on IC pipes. I want to keep clean and simple as possible.
