View Full Version : i head on e block a bolt on?

04-03-2004, 02:29 AM
ive seen a few vague threads here about this...im wondering if bolting the 90 i head(including the intake, harness,computer) onto the 86 e block involves more than just sockets and wrenches....any clearance issues.....expected gains over an i motor??:confused: :confused:

04-03-2004, 02:49 AM
i've read something about the pistons being different, and will touch or something. not exactly sure, ill go look for something.

04-03-2004, 02:52 AM
2.) What parts are needed?
For a complete and detailed list, see page 2. But generally speaking, for an 84-87 325e you need the entire fuel injection system from a 325i as well as the intake manifold, throttle body, and complete cylinder head (with cam, valves, and dual valve springs. However, the stock 325e pistons will not work with the 325i head because of the different design; the 325i has a domed cylinder chamber to match the domed pistons while the eta has a flat cylinder chamber to match the flat pistons. Throw the flat 325e pistons into a 325i head and you have a mismatch that causes a lower compression ratio, and this for this procedure, lowering is a bad thing. So that leaves you with 3 choices:

more found here:

04-03-2004, 03:02 AM
i heard a good motor is using the 2.7 bottom and a 2.5 top end a good torquey motor !

04-03-2004, 03:23 AM
it won't work unless you change the pistons to but then you lose compression

Read This (http://www.bmwe30.net/cgi-bin/datacgi/database.cgi?file=articles&report=view&ID=00129&Section=03)

04-03-2004, 03:28 AM
Originally posted by BimmerKris
it won't work unless you change the pistons to but then you lose compression

Read This (http://www.bmwe30.net/cgi-bin/datacgi/database.cgi?file=articles&report=view&ID=00129&Section=03) just what i was looking for..thanx

04-03-2004, 04:17 AM
no prob!:cool: