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Old December 21st 04, 11:44 PM
Mr Fix It
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Yep ... in my case i'll be using my 323i head ... or maybe my 520i
head, hmmm ... maybe even my 320i head, i already have these in
the workshop!!
They are all pretty much the same, with the 323i head having the bigger
ports (or rather ... ports the same size as those on the eta's head).
I've not decided what camshaft to use ... i might go for an aftermarket
285 degree cam, which should go quite well on an L-jet system.
(A 285 degree cam on motronic v1.0 is asking for an earthquake
on four wheels by the way, because it won't adapt).

There is an issue with matching the corrct head to the correct block,
people in the states have ended up with 8.8:1 compression prior to
adding a turbo, simply by using later 325i heads with american pistons.
In my case i should be retaining the 11.0:1 compression as the 323i head
has identical combustion chambers to the standard eta head .... whereas
the later 325i head has double semi-hemispherical chambers in the head,
which adds a few cc's but reduces compression a bit.
I intend to time the cam to keep the power band low down ..... and will be
keeping the eta's inlet tract the same, although by using conventional bmw
valve springs it will be able to rev to 6500rpm .... rather than its present
5000rpm.
All good fun .... plus it uses up the spares i have!!


--
Regards....
Steve

"John Burns" > wrote in message
...
> > 1/ The manual box i have has no provision for the two sensors which plug
> > into the bell housing which connect to the motronic v1.0 box.

>
> Now that IS odd. Even on boxes from Jetronic-L cars I thought there were
> blanking panels or obvious parts in the casting that could be drilled
> and threaded. Must be a very old box!
>
> > Bearing in mind the existing motronic box probably won't even run
> > this hybrid engine (its non-adaptive as well) its better all round if i
> > change to L-jetronic now, prior to fitting the manual gearbox.

>
> Jet-L is still a good system, it lived on for a long time after BMW
> converted everything to Motronic. I'm sure my mate's 97 Seat Ibiza is
> Jet-L!
>
> I'd have thought you'd use the eta block with a 325i Motronic head
> though. I thought the 323i head conversion was mainly done to early US
> etas before they got the super-eta Motronic version. But I dare say
> you've researched this more than I have!
>
> --
> Who needs a life when you've got Unix? :-)
> Email: , John G.Burns B.Eng, Bonny Scotland
> Web :
http://www.unixnerd.demon.co.uk - The Ultimate BMW Homepage!
> Need Sun or HP Unix kit? http://www.unixnerd.demon.co.uk/unix.html



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