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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 06-21-2004, 11:18 AM   #1 (permalink)
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"Some guy" told me I could use the head off a 2.5 on my 2.7 eta engine and improve performance. Is that right and if so, which head.
Thanks.
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Old 06-21-2004, 11:56 AM   #2 (permalink)
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Well the 318 head sure as heck wouldn't work.
It's got two fewer cylinders.

But yes, the 2.5 i-spec head can be switched out to the Eta engine, along with some other pieces to combine the low-end of the 2.7 and the revability and horsepower of the 2.5. If you stroked it to 2.8 liters, you'd have a real monster.
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Old 06-21-2004, 02:04 PM   #3 (permalink)
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Thanks. That shows how much I know about BMW's! If I make the switch, will I lose compression? Another thread said the compression ratio would go down to 7.5 due to different pistons?
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Old 06-21-2004, 02:39 PM   #4 (permalink)
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I don't know if it'll drop or not, but it's not going that low.
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Old 06-21-2004, 04:03 PM   #5 (permalink)
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Thanks. Where should I look to find one already rebuilt?
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Old 06-21-2004, 08:14 PM   #6 (permalink)
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www.bmwengine.com

or check out bavauto.com

or check out r3vlimited.com
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Old 06-22-2004, 01:28 AM   #7 (permalink)
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compression will drop and u will need to get custom pistons, or accept the lower compression ( i believe it drops to 8:8:1) and pick up pistons from a 528e or a Super ETA...

or shave the top of a 325i piston
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