boring 2.5 to 2.8

[spieluhr]

ok, if im going to bore a 2.5l engine to 2.8l can i use oem pistons, etc. from a 328? if so where is the best place to get them for a good price?

[spieluhr]

also, if someone could give a detailed list of the parts needed to replace, or a site where i can find that that would be great.

[Kevin325i]

I've not heard of a 2.8l conversion, but I have heard of a 2.7l that uses a 2.7l crank and the normal pistons. It would probably have to be a custom job, but it might be possible to use the 3.8l crank and pistons and find out the bore diameters.

I assume you're attempting to build one of these? The engine is based on the m50 so it is possible.

[spieluhr]

so if i bore it to 2.7l i can use factory pistons, etc. but need a new crankshaft. anything else? Any other ideas or diameters that people know have happened or have info on.

i have a 93 325is btw, thought it might help for you to knwo.

[buuhh99]

u do relize that the 328 i had a 2.5 liter in it

[mikester328]

I'm pretty sure the 328 had a 2.8L in it... you can see a huge jump of torque over the 325's torque... they had to do this because of the OBDII so that the car's performance would suck...

[buuhh99]

i think your right i am mistakin the 323 my bad

[e36_m3_Turbo]

i heard u can bored it 2.9l. not sure if thats true. but worth a try