1.8i head for Megasquirt?

[TobyB]

Also, the benefit of having the injector ports in the head is that I wouldn't need a new throttle body, I'd just use my DCOE carb body (on the Lynx manifold, my current settup) as the throttle body, as opposed to getting a TWM throttle body for it and trying to run with just 2 injectors.

Well, heck, there's your reason! Use it!

The cis injectors pushed in with a stiff rubber bushing.

You will have to open the holes in the head up a bit and make a rail.

The 318 rail fits the 318 manifold... although the spacing will be

about the same- might be worth getting one and trying.

If you use flattop pistons, now you need a turbo! The 8.very little

compression ratio would be great for a bar or so.

If you want more compression, talk to Jeff Ireland-

they have a few solutions to get some dome in there.

It's a good head design.

t

[AustrianVespaGuy]

Wait, are you sure that the injector ports need to be 'opened?' I thought I would just need to install new bungs for the EFI injectors, such as these:

http://www.bitzracing.com/products/injector_bungs/injectorbungsdetails.html

It looks to me as if the CIS bungs have already been removed from this head, and that I would simply have to press these EFI bungs into the ports and be good to go; does anyone agree/disagree with this? Thanks!

-Carl

[TobyB]

Hard to tell. The Porsche CIS rubber injector plugs don't really look like the BMW ones-

there's a relief machined into the port in the BMW head to retain the plugs,

and the Porsche ones look straight. But it's hard to tell from the pix.

However, I played around with some parts before I left this afternoon,

and the holes in the head are just about the right size for the

318 injectors. In fact, if that relief wasn't there, they'd be a good fit.

As it sits, you might be able to get some larger injector seals (they look like

chubby o- rings) and get them to sit nicely in the relief.

And you heard right- the 318 rail spacing and angle are good.

There's interferece with the regulator mount, but that's no big deal.

t

[AustrianVespaGuy]

Hey, those are some great pics, thanks for checking that for me! I still think the Porsche bungs have a good chance of fitting correctly, but it looks like either way it could be made to work. I'm just glad the spacing/angles for the fuel rail work! One other question now though. It was mentioned that the 1.8i head has a bit lower compression than the other combustion chamber geometries, so would it be possible to just have the head shaved a little bit to get back to the ~8.5 'stock' compression? Or would so much have to be removed that valve/piston and/or cam chain length issues would come up? Thanks again for all of the great help guys, the 2002 forums are the best!

-Carl

[fiftytakedowns]

how much does the head really lower compression?

say a tii with 9.5 pistons were to switch to that...