2.7 eta block

Mon Dec 17, 2007 3:03 pm

Hi all,
ive heard that if i mate my 87 325 head with a 2.7 eta block it will have some nice figure's. is this right and if so does anyone know what i could be looking at figure wise?

many thanks Ashley.

Mon Dec 17, 2007 3:18 pm

It will work but you should check the valve to piston clearance if using a diffrent cam.
You would be best fitting 325 pistons that will work better with the head.

Mon Dec 17, 2007 3:22 pm

will the 325 pistons fit properly and will it give me a good enought power increase to bother?

cheers Ashley

Mon Dec 17, 2007 3:37 pm

This is a bit of a myth, using an eta block and a 325 head.
From what i understand it can be done but i think you need something like an eta block that needs to be cut down along with a 325 head a 324td crank and 325 high comp pistons.
It doesnt work putting a bottom end from an engine that produces 122bhp alone with a high comp head and ending up with anywhere near 200bhp.
There are various other ways of doing it, if you can read german it on e30.de

Mon Dec 17, 2007 4:19 pm

Several have been done on the zone mate. Depends on the money you throw at it. Gains can be had from 180/190 BHP through to the low 200's. Very torquey. Can use a 320 head or a 325. Vernier pullies get mentioned a fair bit in the company of the eta block.

IIRC Ant built a Ninja 2.7 with lairy cam and ecu work for an undisclosed sum. Think this made 225.6bhp

^hehehe sorry dude, had too has since had a standalone ECU suite fitted .Ant,

Mon Dec 17, 2007 4:21 pm

A 325i head fits straight onto an Eta block and gives a 9.2:1 compression on a later (post 8/85) Eta engine. Been there, done it! A 2.7 gives a noticeably more torque than a 2.5.

Mon Dec 17, 2007 4:29 pm

There is a thread running at the moment in the conversions section, 2.7 my touring or similar,our friend from Italy is asking the same questions,have a read through and ask if you still have questions.My 2.7 makes around 180bhp,depending on which dyno you belive.....

Tue Dec 18, 2007 8:34 am

many thanks to everyone for the info but ive now decided to go for the standard 2.5 lump

Cheers anyway Ashley