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Old 12-08-2003, 07:59 PM   #1
davide30
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e to i conversion

My friend buy a bmw 325e 2.7 and i would like to know how to do the conversion e to i with hes car???

and he would like to know some spec on that kind of modification.
thank you
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Old 12-09-2003, 02:22 AM   #2
KC Ron Carter
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Here is a link

http://www.bmwe30.net/cgi-bin/datacg...129&Section=03

People always ask and talk about putting an 'i' cylinder head on an 'e' block to improve performance. You would think this makes sense because the 'i' and 'e' are both M20s and the parts are interchangeable. This would work out great if it wasn't for one thing; the 'i' and 'e' combustion chambers are completely different.

On the 'i' chamber (head) you have a large, high volume, dome design. This works well on an 'i' block because an 'i' has pop up pistons. When the raised dome piston reaches top dead center (TDC) it fills the dome chamber and results in a compression ratio around 8.8:1. Think of it as two puzzle pieces. The piston fits the shape of the chamber to make a match.

Then there's the 'e' head. The 'e' chamber is a flat chamber and the pistons are also flat (the 'i' design is superior) so when they are at TDC you get solid compression, and a ratio that is actually higher than an 'i' at around 9:1.

Later,
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Old 12-09-2003, 03:06 AM   #3
EMPOWERD
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Re: e to i conversion

Quote:
Originally posted by davide30
My friend buy a bmw 325e 2.7 and i would like to know how to do the conversion e to i with hes car???

and he would like to know some spec on that kind of modification.
thank you
Do you want to swap motors or do the "i" head swap? The older 2.7L pistons will have to be changed in order to maintain a decent c/r. If you plan on Forced Induction, then leave the "e" block alone maintaining a lower c/r.

There are many differences in both motors, mainly in the head. larger ports, different valves, cambers, 7-journal cam, manifold & T-body grace the free flowing "i" head.
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Old 12-09-2003, 09:25 PM   #4
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re:EMPOWERD

he would like to swap the __i head to put on the e block
thank you

Dave
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Old 12-09-2003, 09:31 PM   #5
davide30
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re: KC Ron Carter

yes i would like more info on that modif , do you know the they give on the m20 after this swap???

thank you

Dave
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