M20 freaks...

[bimmer_E30]

i need help, i have another 325i for parts that has about 240,000KMS thats about 150,000miles or somthing. it runs good but it was involved in a front end accident . so should i swap the complete engine into my 325e along with the wiring harness and trans, or just do the 327i conversion???

[indecline]

Don't be a sleaze and use the 2.7L Bottem-end (ETA)

[bimmer_E30]

hmm.

[bimmer_E30]

i need help homies.

[kenika65]

2.7i all the way, If it was me I would even leave the eta head on and just bolt on the i parts to run the 1.3Motronic

[e30bmlover]

i thought a 2.7 could be made from a 525e bottom end and a 325i head??

[bimmer_E30]

325e , and 528e have the same engine.

[kenika65]

so 2.7i it is?

eta bottom end with all i parts that is the only way to go well if you love torque!

[submwar]

so 2.7i it is?

eta bottom end with all i parts that is the only way to go well if you love torque!

you're better off this way, you'll thank yourself in the end for the extra effort

[bimmer_E30]

but ,how about the lack of compression ratio???

[yberther]

use custom pistons or seta domed pistons...

http://www.r3vlimited.com/board/showthread.php?t=100939

[kenika65]

just leave the eta head on and you will have 9.0:1 compression and a perfect idle like im running.

[bimmer_E30]

but can i rev more than 5000rpm with the e head??

[SpecM]

-Yes etas are good for about 5300.

[kenika65]

Alright the only thing slowing the eta down is the 1.0basic Motronic so what you need to do is read this and hope fully it will help.

http://en.wikipedia.org/wiki/BMW_M20

All eta engines used Bosch Motronic engine management systems that were calibrated for maximum fuel economy. The result was a very conservative spark advance curve and fuel delivery curve. In addition, the Motronic had a built-in rev limiter that engaged at about 4750 rpm. This very low redline was the result of the four bearing cam, soft valve springs, intake manifold and camshaft design. Due to the very low overlap and short duration of the cam and the intake manifold tuning, the motor does not make any power over about 5,000 RPM.
Late 1987 cars produced between December 1986 and September 1987 featured larger valves but were mostly unchanged compared to previous models. Starting in cars produced from September 1987 for the 1988 model year, the eta cars got a more substantial refresh from the factory. This included the more recent Bosch Motronic version 1.1/1.3 with adaptive idle control and revised circuitry, the "885" head casting with the larger valves, ports and revised combustion chambers, new pistons to fit the 2.7 L stroke with the 2.5 L head, a special one year only intake manifold with even narrower runners that opened up at the flanges to match the larger ports of the new head, a dual exhaust system and a 5300 RPM rev limit. A new 6000rpm tachometer was also used. Though it only made slightly more power in stock form, it could be easily boosted by installing a 325i cam and springs, a complete 325i intake manifold and throttle and plugging in the 325i engine control unit. Depending on which cam, chip and intake is used, the combination can make over 180 horsepower with the stock compression ratio.
In aftermarket modifications that are inspired by custom versions of Alpina and AC Schnitzer, the long-stroke eta engine block is often combined with a 325i head to a so-called 327i that combines the high low-rev torque of the eta with the top-range power of the 325i.



Simply put just do what I have done and swap the 1.1/1.3M harness in and get to burning them tires.


I take my stock eta (w/ i double valve springs) to the 6800 redline all the time. Of course I couldn't do it with out 1.3M and all the i parts. Remember the eta has 9.0:1 compression.

If you still have questions then click on every LINK in my 2.7i how to in my sig.