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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 12-25-2008, 08:09 AM   #1 (permalink)
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Question I and E conversions for 325?

Just curious has anyone out there, or know anyone out there that has successfully taking the head off of a 325i and placed it on the block of the older E motor? I currently have access to both motors for the e30 and am getting ready to attempt this conversion, I am just curious if anyone has experienced any difficulties with this or if it is just a bolt up procedure?
Thanks for any input!
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Old 12-25-2008, 07:20 PM   #2 (permalink)
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I don't think you can do that....I think that it wouldn't work.....
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Old 12-27-2008, 09:03 AM   #3 (permalink)
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Depends on what year 325i, If it's a E30 325i then yes the heads will bolt up on the eta 2.7 M20 engine. However your going to drop the compression ratio on your eta M20 because the i M20 2.5 had different taller pistons then the eta M20 2.7. If you plan on boosting it's a good idea if not your going to lose power from doing the swap. You can however swap the camshafts and valve spring over to the 2.7 eta M20 from the i 2.5 M20 and gain some significant top end power. The i 2.5 M20 has a more aggressive cam grind and stronger valve springs then the eta 2.7 M20. If you want the most bang for your buck I would run the Eta 2.7 M20 motor with the I 2.5 cam and valve springs with a Dinan performance chip or the 325i ecu.

This swap is in the cards for me in the spring, I've already installed the Dinan chip and seen a considerable increase in power.
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