Advice on EFI injector to replace MFI

[Bobboloo]

Injectors spray in a wide pattern. If you mount those injectors there I believe you will disrupt the pattern. The spray will hit the sides of the tapped hole and turn to dribble.

If you notice the MFI injector has a long snout that places the tip of the injector inside the port.

You should get some turbo blocks to mount the injectors and then notch the heads port like a CIS or MFI head.

[Fdalgas911T]

Chuck, The rails appear to be homemade, see the pictures above, not sure about the length issue you question but assume you mean the length of the injector in the threaded port. This intake unit is from an engine that allegedly performed well (I have no real proof). We will see how well it works when I get it all going.

Mr Beau, I too am concerned with the "injector-hold-adapter-thingy".

Bobboloo, I too am concerned about the spray pattern and hitting the threads inside the bore. I'm not familiar with the CSI head you mentioned... nor do I know what a turbo block is... By notching the head are you suggesting to further inset the EFI injector deeper into the head? if so there is only a quarter inch or so that can be further recessed. What I have heard but not confirmed is these injectors have a more narrow pattern... just not sure it is narrow enough to avoid the current injector port threads.

Thanks for the interest guys.

[Bobboloo]

I've attached a picture of a CIS head so you can see the notch for the injector. It's on the leftside in the picture.

I can't find a pic of a turbo block. They're not expensive. They mount between the intake runner and the head on a turbo motor. This would be between the throttle bodies and head on your motor. All the block does is hold the injector and isolate it from the heat of the head.

They come in 32mm I believe since that's the turbo port size but they should be easy to port.

[irnwill]

This was my solution a while back; Turbo injector blocks. The injector blocks would have added 2 inches to the overall height.

[Bobboloo]

I see that the blocks Will R. has raise the injector higher than the old stock Turbo CIS blocks. With his you don't need to notch the head.

Will, are those aftermarket?

[irnwill]

The blocks are made for the Turbo EFI conversion. They replace the oem plastic blocks. These are made from aluminum and accept EFI injectors.

[Chuck Moreland]

Sounds like there are a couple "turbo" block options out there. What are the sources?

I have a similar MFI -> EFI conversion in the works and will consider this option.

[A Quiet Boom]

Hmmm, those blocks look like a good project for my CNC mill, of course I've been toying with the idea of just building ITB's but getting the throttle plates right is a lot of work. Where can I get one of those blocks to look at?

[Mr Beau]

I think the Ford injectors have a 30 degree spray angle so there will be a lot of wall wetting with the original solution. When I was looking into this I had bought some motorcycle injectors that were small in diameter and seemed to have a more extended tip which could possibly work in the existing MFI injector holes. I then moved to Europe and wasn't able to continue with the project.

There's a picture in Bruce Anderson's book that shows EFI injectors placed at the top of the stacks. This isn't ideal from an emissions standpoint but is great for power (lots of evaporation and cooling going on).

[rvanderpyl]

Bump back to the top for an update?

[jdm61]

I am a complete amateur in these matters, but with injectors that close aren't you almost going to have the same potential problems as you would with direct injection? Among other things, needing VERY high pressure injector rails, if modern diesel engines are any kind of example.

[lateapex911]

My understanding was that Direct in jection injected directly into the pressurized cylinder. It looks like these are injecting abobe the valve, so they won't see the elevated cyclinder pressures.

[rvanderpyl]

Anything new on this?

[shbop]

enrolling

[rvanderpyl]

Bump for an update?

[Fdalgas911T]

Bobboloo... Thanks very much for the lesson on CIS heads
IRNWILL... Thanks for sharing the turbo blocks idea I will keep that concept in mind
Mr Beau... Thanks for the info on the ford injectors and sharing the info from Bruce Anderson's book

The fuel rails are now complete. Have added all the sensors for the Motec, air temp, engine temp, baro pres, throttle pos, O2 sensor (indy car version), wired them all and the injectors plus the MSD unit. Everything is ready to go and back in the car. Now need to program the Motec unit and fire her up.

She is looking good to me, here is a pic just before putting her in the car.

[rvanderpyl]

All right, keep us updated I have pieces all over just waiting to decide how to go forward with fuel injection on my engine, and this seems to be a nice combination of 'old' and new

[Fdalgas911T]

Update: I'm back on the road again! Total time spent to remove, rebuild and reinstall the engine has been exactly a year. The EFI appears to be working fine however we are still tweaking the fuel maps in the motec unit. I am in the breakin period and anxiously awaiting a full dyno test and expert tuning in the near future. The engine feels very different from its original state 2.4T with MFI. Much more throaty sound and acceleration is also better but I am keeping it below 5K RPMs during breakin. Now I need to take some time to drive and evaluate things overall. Here is a picture of the car and the engine.

[Fdalgas911T]

Whoops, here are the pics

[Chuck Moreland]

Looks good, but I think we jumped over a couple steps. Looks like you did not use injector blocks between tbodies and heads, and have installed EFI injectors into the original MFI holes.

Can you explain what you did (injectors used) and post some pics with closeups of the injector mounting.