2.5 to 2.7

[john-rambo]

right im getting at some point a complete 325i not a sport and im planning on putting all the running gear into my mint 318i auto i realise all the little snags but thats wot modding is all about innit. what i need to know is what extras do i need to build it up into a 2.7 and what is ETA meant to mean regarding the crank? what cars do i need to rip appart for these bits? help much needed.

[Jhonno]

quick search would reveal all..

[fowler]

john i have complet 325i set up ready to go in the for sale section plus i aslo have a eta crank
for the conversion there are two ways to go
either eta crank late 325 pistons 320 head cheap 2.7 = roughly 190bhp + bbtb +6branch may be more
or ete crank any 325 pistons and a machined 325i expensive bexley style 2.7 = roughly 2.10bhp with a few other mods bbtb +6 branch + chipped ecu and maf conversion

[Jhonno]

325i head can be slapped on an eta bottom end also

[fowler]

thought it had clerence issues on the long throw crank

[Jhonno]

nope, none

[fowler]

fair do's why do bexley's machine the head ???

[Jhonno]

extra compression i should imagine dude

[fowler]

well how high do you want i i know eta is up in the 10's with the early 325's

[Jhonno]

yeah but it drops a little when you fit the 325i head as the eta uses a 320i style head as you know..

compression ratio is still more then enough with a 325i head tho!!

[john-rambo]

so i can use a 325 head what car do i get the bottom end from? will a normal 325 diff cope with the power or do i need a 325is diff with lsd

[john-rambo]

how much power can you actually get from a 2.5 without doing the 2.7 thing if i do do the 2.7 am i best off looking for a 320 instead

[toby]

Do a forum search john-rambo- all the questions you have raised have already been addressed - problem is the search facility doesn't seem to recognise numbers (ie 2.5 - 2.7 doesn't come up). Simply posting 'new' topics makes the real information harder to find for everyone. Gentleman known as Argos is the authority on this at the moment and he has completed several different conversions.

here is an example of threads
http://www.e30zone.net/modules.php?name ... ight=argos
http://www.e30zone.net/modules.php?name ... ght=#14128

there are more so have a look

[john-rambo]

right this has got me thinking how much more of a ball ache is it to do the 24v conversion what do i need for this