1.3 Motronic Up-Grade & 2.7i How To

[whitebulat22]

Block is exactly the same and it is just the 3 mm crank difference that adds the displacement.

[Chilezen]

What is the difference between B25 and B27 block? Is it just the throw of the crank that produces the greater displacement?

[Regnar75]

id love to get a cam.

[Andy.B]

if its any consolation i have the flat top pistons and an 885 head (full motronic 1.3 swap) and i love it. i am putting a new clutch in at the moment, but plan on getting a dyno test to see what its at. even if its not on par with a nice 325i its still a massive improvement over the ETA

I just wrapped up my flat top piston 2.7i build. With a 274 cam, chip, intake, and 3.25 diff, the car pulls much harder than my gf's stock (chipped) 325i with a freshly rebuilt top end, and a million times harder than the eta did (which had the same intake and diff).

[Regnar75]

if its any consolation i have the flat top pistons and an 885 head (full motronic 1.3 swap) and i love it. i am putting a new clutch in at the moment, but plan on getting a dyno test to see what its at. even if its not on par with a nice 325i its still a massive improvement over the ETA

[whitebulat22]

Well I'm definitely not trying to spend more on making a 200 head setup then using the 885 so thanks for warning me. It's my first project ever so the goal is just to build a hot E30 and the 885 seems to leave both NA and boost doors open in the future.

[squidmaster]

You'll probably end up spending more money on getting head work done than just finding a complete swap.

[digger]

It will be easier to slap a 885 casting on there and be done with it than getting the 200 casting up to speed but it can be done.

[Regnar75]

whats your main goal? keeping compression? or budget? for the 200 head if you ported them it would keep your compression the same (flat piston, flat head) but then swap over all the I components into the new head. whatever floats your boat man. itll work it might just cost a bit more. i really like my 885 on eta block its a blast, and a ported 200 and I components and a cam will be a ton of fun, just not in my budget.

[whitebulat22]

I have a 86 eta that's gonna be na for a while, I was always thinking I needed the 885 head to make a 2.7i. Is wiring a bunch of I stuff and swapping the manifold cam valve springs and belts all that's needed? If I port the 200 head to match the intake and throw on larger valves with a 272 cam is it more worthwhile than getting the whole head for now?

[Regnar75]

Andy is correct.
the Oil level, and oil Pressure sensors have different connections from motronic 1.0 and 1.3 harnesses, id recommend just buying a new oil pressure sensor and use that, the oil level might be fine to splice.

[Andy.B]

Alright so i'm starting to collect parts for the 2.7i swap. I thought I read somewhere I need some type of oil sensor? Anybody have any info on that? Also do I need the i timing cover or can i get away with running the eta timing cover.

I believe the issue with the sensor is that the oil level pressure on the e car and I car were different, with different plugs. AFAIK, you can either just cut and splice the I harness connect to the existing e sensor, or replace the sensor.

The difference in timing cover relates to the early vs later style cooling system. If you keep the early dual outlet water pump, then you can keep the early timing belt covers. The late covers have a mounting point for the metal coolant crossover tube.

[scarecrow]

Alright so i'm starting to collect parts for the 2.7i swap. I thought I read somewhere I need some type of oil sensor? Anybody have any info on that? Also do I need the i timing cover or can i get away with running the eta timing cover.

[Overlord475]

So besides the oil passages missing, there's no difference in the actual head between the the i an eta? I was under the impression I needed the whole i head.

Check it: http://www.r3vlimited.com/board/showthread.php?t=283179

[Liquidity]

Damn I just got my hopes up way too much for that.