2.5 head
Posted: Wed Apr 27, 2011 1:32 am
Hi guys, my m20 2.5 has 2.5/2.7 stamped on it, where my mates just has 2.5? What's the difference? Thanks
Page 1 of 1
Re: 2.5 head
Posted: Wed Apr 27, 2011 2:44 am
just that.
Re: 2.5 head
Posted: Wed Apr 27, 2011 3:35 pm
Gunni wrote:just that.
Re: 2.5 head
Posted: Wed May 18, 2011 10:41 am
It may be the 325e 
Re: 2.5 head
Posted: Wed May 18, 2011 11:16 am
The late eta engines(post'85,I think)are known as 'super eta's' and used the same 885 head casting as 325i.
We only saw E28 525e in the UK,and very few,if any,of these super eta's came here.Most found their way to the USA in the form of 325e.
But all post '85ish 325i heads will be marked 2.5/2.7
We only saw E28 525e in the UK,and very few,if any,of these super eta's came here.Most found their way to the USA in the form of 325e.
But all post '85ish 325i heads will be marked 2.5/2.7
Re: 2.5 head
Posted: Wed May 18, 2011 12:04 pm
Super eta in the 5 series are the 528e
Re: 2.5 head
Posted: Wed May 18, 2011 12:59 pm
The 528e before march 1987 was a normal eta (with a 200head) with 9:1 CR. Post march 1987 528e became "super eta's" with an extra 6 hp using the 885 head with a 4 bearing cam. These have a CR of 8.5:1 I believe.