M10 Intake Manifolds (for EFI)

[jonbem]

Happy Friday to all....

 

I'm looking to better understand the hardware required for conversion to EFI. I did try searching and while there is a lot of great info I cannot find a definitive answer to my question.

 

I'm wondering if the old style mechanical FI manifolds are the same as the EFI versions - or maybe asking if they are "the same" is not what I should be asking. I'll re-phrase to ask if a Manifold typically found on a Mechanical set-up can be used for an Electronic set-up.

 

Many Thanks in advance...!

[Schnellvintage]

This is what I recommend. 1984-1985 e30 318i.

 

fwiw,

Matt

[TobyB]

Yes- the tii manifold CAN be converted to EFI,

but what most do is take the early 320 CIS manifold, which looks

the same as the tii, and inject THAT.  The CIS throttle body is small, but there

are many that easily adapt, and often have position sensors integrated.

CIS only has a switch, iirc.  You have to machine the manifold to suit

injectors, and make a rail, but when you're done, especially if you're careful,

it can look cosmetically like a tii, but perform like modern EFI.

 

OR they go to the E30 M10 setup which comes pre- rigged for electronic injectors

with a rail and other parts, as Matt shows above.  From there you can keep the

early Botch system, or go to an aftermarket ECU.  The Botch does not do ignition

(much) and relies on a distributor.

 

There are a lot of threads on this, but most of them are from quite a while ago now,

and may even have been on 2002list@ids.net...

 

t

 

[jimk]

 A early 320 CIS manifold is satisfying if are not "plug and play" oriented.

Manifold does not have to be "machined".  A hand drill and a reamer will make the mods with an injector insert. 

The stock fuel rail can be used, no need to build another.

A 50mm Ford throttle body works fine, it has an attached TPS, and has a cable operator with brackets included.

[drew_step]

I'm planning on using the 320 CIS manifold with no machining/reaming at all by using larger OD orings. I found some orings for converting Ls1 injectors to work with Ls2/3/7 manifolds (https://www.ebay.com/itm/325317817635?hash=item4bbe73f523:g:QakAAOSw7C5cTomo) which seem like they will work.

[jimk]

If not, here is the bushing.  JB weld it in.

Injector Boss.pdf

[jonbem]

Thank you to all who replied - very helpful....!

 

I  had always been under the 'impression' that the Mechanical and Electronic Manifolds were completely different but it seems that is not the case and the Mechanical version can be used for a EFI set-up.

 

Cheers!

[SydneyTii]

What sort of power does a setup using the 320 CIS kit yield?

[d.hitchcock]

I had the 318i (e30) intake for two years. Made roughly 120 lb-lbs, 125 whp.

It's a solid setup.

Added a photo for fun.

 

[jimk]

1 hour ago, SydneyTii said:

What sort of power does a setup using the 320 CIS kit yield?

The same power as a 318 manifold.

The two use different space in the engine compartments.

The 318 cost less to produce.

[TobyB]

Quote

The stock fuel rail can be used, no need to build another.

...the CIS system has no 'fuel rail', you know, Jim, just 4 plastic pipes that come from the distributor.

 

That looks like a later E30 rail.

 

t

since we're 'correcting' each other...

[jimk]

2 hours ago, TobyB said:

That looks like a later E30 rail.

That's what I meant, but not said.

Space above the rail is tight with the 1st generation EFI (60mm over all length, OAL) injectors.  Modern injectors can be had in several lengths. 34, 48 and 60 mm.  The 48 would work better, the fuel rail mount needs fabrication for either.  Nee 14 mm orings for both top and bottom.

It's necessary to know the physical details of the injector desired.