Seta engine to race engine

[SNEAK413]

I am working on a n/a race engine build. Now when I say race engine I'm not talking about spending lot of cash mainly because a lot of the research has been done on these engines. The engine is a seta with all of the b25 top bits. The money has went to suspension, safety, and tires tires tires. It runs strong but the rules are really free.

I have a folder with almost all know n/a stroker discussions so I know about all of that stuff. However I want to build this engine myself mainly
Because it is fun. And the local junkyard has many e36s in it. So the rules

1) the bore can be 1.52mm bigger which brings it from 84mm to 85.52mm
2) unrestricted c/r along with pistons
3)unrestricted crankshaft
4)unrestricted rods
5)unrestricted valve train(rockers springs etc)
6) unrestricted camshaft
7) unrestricted intake as long as it doesn't run into the runners

[digger]

how much power are you after? how much $$$?

[SNEAK413]

your the man I was looking to talk to
Ideally 200+ at the wheels

right now im at
84mm crank m50b28
135mm rods s50
some sort of piston, size I do not know

[SNEAK413]

That's 200Hp (sae)
I love your 3.1L build but I do not know of having that bore of 85.52mm what options this now brings. I also plan to document this build like what you have done with dyno proof. The thing is when I get into the piston squish and things like that I get lost. But from what I have read and seen, any one can do one of these builds. I know I can throw money at this and get ridiculous power. However I just want to do as much of the work as I can. It gives me peace.

[digger]

why 85.52mm?

you can use custom pistons which allows a higher CR, clearance for better camshaft, 135mm rods etc.

10.5 to 11:1 with lightly ported head, schrick 288 or similar then good to go. i would use a RHD ITB kit and PNP MS. a nice set of headers and free flow system with Y-pipe or X-pipe and 200whp is easy and its relatively cheap

[SNEAK413]

The rules state that the engine can be bore by .060 inch or 1.52mm that's why I didn't know if it would be worth it to bore it out or just go with the custom pistons and leave it at 84mm.

[digger]

if you are getting custom pistons then 84.5mm would be the best idea

[SNEAK413]

Awesome well I better get to work on sourcing parts. Any word on the dyno with your new exhaust I'm curious about that x pipe placement?

[digger]

its much better location for the X-pipe for my setup, id like to try even further back but wont happen. ive been playing with different injections and ignition setup so getting a proper back to back other than the one i posted before wont happen as too many changes other than the exhaust. need to sort my TPS out as im getting a bit of drift and noise so not getting a full retune with load sensor that isnt 100%

[SkiFree]

I won't go into details publicly quite yet, but I will have a pretty neat piston ready soon for the 84mm stroke. PM me for now if you might be interested .... m142 alloy, offset dish, slipper skirt, $975 range.

Motivating reason I am having them made ....... is so I can use a set.