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iamhedgecore
02-01-2007, 01:25 PM
hey guys,
i am trying to get some more power out of my 86 325, so my questions are these...

1 can you use the stock i cam in the e head(along with springs...ect), so you can retain the high compression ratio, or do you have to worry about the valves colliding with the piston?
2 what can you safely rev the bottom end out to? I figure it isnt as high due to the increased stroke and less bearings... i dont mind a little less life, but i dont want it blowing up on me in a couple days either...

what do you think?

carcrazy
02-01-2007, 01:29 PM
Do you have a perf chip and a different ratio LSD in yet?
the HP gain on 325e are more pronounced then 325i with the chip

I did it with a 86 325e with a LSD from a 86 635Csi (3.64) made it pretty quick
geared more for back roads though, it would tach over 4k @ 80mph on the freeway

a dif from a 5 series is what most people go with, 3.25 ratio I think

nefarious7907
02-01-2007, 03:47 PM
You need to PM etasport or is it eta sport?
But He did this swap and I am getting ready to do this.
But you need to drill the oil journals in the eta head to properly lubricate the "i" cam.
The outer valve springs are the same and you should be able to drop in the just the inner valve spring from the"i".

I am going to get new OEM springs but I am tempted to upgrade them, the thing is justifying spending more money on an ETA. This swap could easily be done with used parts for a less than $150. I am going to try and do my swap around changing the head gasket and timing belt this spring.

bearing01
02-01-2007, 04:12 PM
I'm confused. I thought the E and I cams had a different number of bearing journals. To do the swap you had to swap the head.

325e
http://www.autohausaz.com/secure/PartImages/11311276441.jpg


325i
http://www.autohausaz.com/secure/PartImages/11311716138.jpg

Could someone correct me.

nefarious7907
02-01-2007, 04:19 PM
They do have a different number of bearing journals and they are already there in the eta head, as if bmw knew that they were going to used them later. There are four holes that need to be drilled to allow oil flow to the journals. I would find Eta Sports pic on R3v right now but I am kinda busy.

bottlecape30
02-01-2007, 09:28 PM
If you do it make sure you, only drill the the intake side oil jurnals

peerless
02-01-2007, 10:55 PM
If you do it make sure you, only drill the the intake side oil jurnals

Very good advice. Only the intake side gets drilled.

I am running a chip and 3.46LSD and its very respectable perfomance from a 4 door sedan. Revs are 3200@80mph.

Regarding the eta revability. It will take it. In stock form probably not a long time, 100K miles? If you can build engines and have some money then the door is wide open.

I am currently building a 2.7 with a 323 cylinder head and 2.5 272 cam. It should run pretty nicely.

carcrazy
02-01-2007, 11:04 PM
my 86 eta had 150k miles on it when I installed the chip and 3.64 LSD in it
ran it hard (redlined at 120 on the freeway many times)
for another 130k miles before I sold it

I got the car cheap so I ran the same timing belt (replaced at 150k) the whole 130k
when I sold it (at 280k) all it really needed was a minor valve adjustment

man those eta engines are tough :D

bottlecape30
02-01-2007, 11:59 PM
my 86 eta had 150k miles on it when I installed the chip and 3.64 LSD in it
ran it hard (redlined at 120 on the freeway many times)
for another 130k miles before I sold it

I got the car cheap so I ran the same timing belt (replaced at 150k) the whole 130k
when I sold it (at 280k) all it really needed was a minor valve adjustment

man those eta engines are tough :D

Good heavens O:) Please tell me you told the poor guy that bought that car it needed a timing belt change.

I run a port and polished 200 casting head with bored out i intake, big bore i throttle body, JC chip, 3.33 LSD rear end, custom exhaust and a few more things i can't think of right now. I'm running 150whp and 180lbs tq. It goes pretty good.

I'm working on a revised bored i intake and throttle body, and a 731 head with the 323 cam port and polished, and bored exhaust manifolds. I hope to be running around 170whp and that is before i supercharge the sucker.

I will say the best improvments you can make a rear diff and chip (or tuning). I also like the z3 steering rack.(but this is not the right fourm for that.)

iamhedgecore
02-02-2007, 09:16 PM
i was thinking that i would run mega squirt, for the spark and fuel, i fugured that would get me at least what a chip does... esp if there was a port and polish... also a 3.73 lsd... or something close. i want this for an auto x car...

bottlecap. did you say you used the E head? with i valves? and it all worked out? i know its choked upstream still but that can be dealt with.

bottlecape30
02-02-2007, 09:31 PM
i was thinking that i would run mega squirt, for the spark and fuel, i fugured that would get me at least what a chip does... esp if there was a port and polish... also a 3.73 lsd... or something close. i want this for an auto x car...

bottlecap. did you say you used the E head? with i valves? and it all worked out? i know its choked upstream still but that can be dealt with.

No i just used the 200 head with all the 200 parts 8-[ just a port and polish. I was on a budget and couldn't buy any new parts for it, just a set of 323i springs ( they are slightly stiffer).

RIPDOT
02-03-2007, 08:51 AM
I chipped mine, put a turbo and free flow exhaust and it will whoop up on my e36 M3 anyday. I need to change the rear end to an LSD but it is nice to hit 60Mph in 2nd. I would also recommend puttin gstiffer valve springs in as I need to.

iamhedgecore
02-03-2007, 03:26 PM
bottlecap this is for you again...

sorry for being a super noob... but what is a 200 head? where did you source it from?


thanks alot for your help...

e30_325es
02-03-2007, 06:04 PM
200 casting head = 325e head
731 casting head = 323i head
881 casting head = 325i head

bottlecape30
02-03-2007, 06:10 PM
Thanks e30_325es, yup that is it. If you have an eta from any year other then 1988 then you have a 200 head casting.

digger
02-03-2007, 10:09 PM
200 casting head = 325e head
731 casting head = 323i head
881 casting head = 325i head

early e30 m20b23 also used the 200 casting.
also m20b20 is 200 iirc.

bottlecape30
02-03-2007, 10:45 PM
yes but not in the US because, the 323i and 320i where euro models never officaly imported to the US.