Hi,
I have an E21 315, and have picked up a second hand engine out of an european automatic 320/4. Is anyone able to tell me some specs on this engine? Mainly wanting to know what compression ratio they are standard, as I've found conflicting information on the net.
Can get engine number if this helps.
Sparkle
320/4 specs needed
- Jeroen
- Site Admin
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- My E21(s): '81 323i Baur
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Re: 320/4 specs needed
Oct 76 M10B20 indeed. We have all the factory info up here http://www.bmwe21.net/?page_id=295
Regards/groeten, Jeroen
-
sparkle
- E21 starter
- Posts: 22
- Joined: Fri Jun 06, 2008 12:11 pm
- My E21(s): 315
- Location: New Zealand
Re: 320/4 specs needed
Hi,
I have found conflicting information on the internet.
Were 320i the only 2ltr m10s in an E21 above 9:1 compression?
Were all 320, including Euro/US specs 8.1:1?
I have found conflicting information on the internet.
Were 320i the only 2ltr m10s in an E21 above 9:1 compression?
Were all 320, including Euro/US specs 8.1:1?

- Jeroen
- Site Admin
- Posts: 29994
- Joined: Tue Sep 14, 2004 12:23 pm
- My E21(s): '81 323i Baur
- Location: The Netherlands
- Contact:
Re: 320/4 specs needed
The E21's equipped with M10B20 all appear to have a CR of 8.1:1 indeed. Unless someone else has different info?!
I can have a look if I have any other data but the info on my specs pages was all taken from official BMW specs lists. Please note that for example the 2 litre M10 from the 2002 is a different engine with a different CR.
I can have a look if I have any other data but the info on my specs pages was all taken from official BMW specs lists. Please note that for example the 2 litre M10 from the 2002 is a different engine with a different CR.
Regards/groeten, Jeroen
Re: 320/4 specs needed
320i (euro) 9.3:1 http://www.bmwe21.net/?page_id=295Jeroen wrote:The E21's equipped with M10B20 all appear to have a CR of 8.1:1 indeed. Unless someone else has different info?!
I can have a look if I have any other data but the info on my specs pages was all taken from official BMW specs lists. Please note that for example the 2 litre M10 from the 2002 is a different engine with a different CR.