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> EFI project has started
Superhawk996
post Jan 12 2023, 05:04 PM
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Anyone priced a MFI rebuild? (IMG:style_emoticons/default/blowup.gif)
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mb911
post Jan 12 2023, 05:06 PM
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QUOTE(mate914 @ Jan 12 2023, 02:15 PM) *

I would like to see a complete list of parts needed.
Thanks, Matt


I have a spreadsheet that I can share
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mb911
post Jan 12 2023, 05:10 PM
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QUOTE(Superhawk996 @ Jan 12 2023, 03:04 PM) *

Anyone priced a MFI rebuild? (IMG:style_emoticons/default/blowup.gif)



Yes it’s silly expensive.


For everyone questioning why I am doing it this way.

Well I had great experience with a 3.2 ss turbo engine I built years ago that produced 400 whp and ran a rising rate fuel pressure regulator and mega squirt that was an adaption of Tony’s @ Bitz racing.com system though I used a 3.2 intake. I was impressed with that setup as it worked all the time with a simple turn of the key and ran perfectly in all weather.

That and I am trying to do this cost effective

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Superhawk996
post Jan 12 2023, 05:21 PM
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QUOTE(mb911 @ Jan 12 2023, 06:06 PM) *

QUOTE(mate914 @ Jan 12 2023, 02:15 PM) *

I would like to see a complete list of parts needed.
Thanks, Matt


I have a spreadsheet that I can share

(IMG:style_emoticons/default/first.gif)
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mb911
post Jan 12 2023, 06:20 PM
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QUOTE(Superhawk996 @ Jan 12 2023, 03:21 PM) *

QUOTE(mb911 @ Jan 12 2023, 06:06 PM) *

QUOTE(mate914 @ Jan 12 2023, 02:15 PM) *

I would like to see a complete list of parts needed.
Thanks, Matt


I have a spreadsheet that I can share

(IMG:style_emoticons/default/first.gif)



Email sent to you
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mb911
post Jan 12 2023, 08:19 PM
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For you viewing pleasure Attached Image
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Root_Werks
post Jan 12 2023, 11:10 PM
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(IMG:style_emoticons/default/blink.gif)

According to my wife, boss, coworkers and kid, I'm kinda slow.

This is a FI system that look like carbs?

If true, kinda cool!
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mb911
post Jan 13 2023, 06:07 AM
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QUOTE(Root_Werks @ Jan 12 2023, 09:10 PM) *

(IMG:style_emoticons/default/blink.gif)

According to my wife, boss, coworkers and kid, I'm kinda slow.

This is a FI system that look like carbs?

If true, kinda cool!



Yes sir
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gereed75
post Jan 13 2023, 09:34 AM
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Ben. On your motor, what was covering/plugging the injector port prior to installing the injector adaptors??
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mb911
post Jan 13 2023, 11:16 AM
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QUOTE(gereed75 @ Jan 13 2023, 07:34 AM) *

Ben. On your motor, what was covering/plugging the injector port prior to installing the injector adaptors??



Plugs that were a kit I remember be sold through automotion back in the day.
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mb911
post Jan 13 2023, 03:14 PM
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Vacuum fittings selected. I will have to drill and tap each manifold to get a good signal for the MAP sensor Attached Image
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gereed75
post Jan 13 2023, 04:38 PM
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QUOTE(mb911 @ Jan 13 2023, 04:14 PM) *

Vacuum fittings selected. I will have to drill and tap each manifold to get a good signal for the MAP sensor Attached Image


Here is what I did for vacuum fittings on the mag throttle bodies. The little brass tube at an angle on the far left throat next to the idle air bypass screw is the single stock vac port. I machined the middle and right throats for insertion of brass tubes and then used JB Weld to form a boss to seal them that mimics the stock boss.

I’ll run the six vac lines to an accumulator to smooth the vac signal. I hope to run a TPS driven alpha N and MAP signal to the Motec. Hoping to get throttle response as good or better than MFI.

Attached Image

You can see the injector ports on this engine I am using for mock up have been sealed with JB Weld or similar by the PO. I think the ports on my actual engine are sealed with the screw in plugs you mentioned.
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mb911
post Jan 14 2023, 05:54 AM
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QUOTE(gereed75 @ Jan 13 2023, 02:38 PM) *

QUOTE(mb911 @ Jan 13 2023, 04:14 PM) *

Vacuum fittings selected. I will have to drill and tap each manifold to get a good signal for the MAP sensor Attached Image


Here is what I did for vacuum fittings on the mag throttle bodies. The little brass tube at an angle on the far left throat next to the idle air bypass screw is the single stock vac port. I machined the middle and right throats for insertion of brass tubes and then used JB Weld to form a boss to seal them that mimics the stock boss.

I’ll run the six vac lines to an accumulator to smooth the vac signal. I hope to run a TPS driven alpha N and MAP signal to the Motec. Hoping to get throttle response as good or better than MFI.

Attached Image

You can see the injector ports on this engine I am using for mock up have been sealed with JB Weld or similar by the PO. I think the ports on my actual engine are sealed with the screw in plugs you mentioned.



That’s an idea for vacuum ports. Might look at that
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r_towle
post Jan 14 2023, 01:43 PM
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I’m a bit confused.
Newbie to modifying a 6 here, but I have webers and will be doing some sort of fuel injection going forward due to car sitting for months in winter, not DD etc etc

So, mine is a 3.0 that I assume was using the old FI, but that is all gone.
Motor came with webers.

My question is, can I follow you, copy you, without modifying my heads in any way? I’m happy to get adapters for the injectors…but I’m concerned with head changes.
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gereed75
post Jan 14 2023, 04:51 PM
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The 930 heads do not have an injector port like the earlier MFI "E" heads had. From what I have read there is no room on the later 930 heads to even machine a port to accept an injector.

The 930 used an injector block that bolts to the inlet port to house the injector. Those would work to hold an injector but at that point the carburetor throat spacing does not match the intake sport spacing.

Don't think that could be made to work with carbs.. Clewit makes EFI systems that use that injector block but then they use ITB' s or the stock CIS intake manifold with the correct spacing to match the inlet ports
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rhodyguy
post Jan 14 2023, 05:04 PM
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What becomes of float bowls and other carb related items? Does everything other than the vac ports you’re putting in get plugged? Do the triple Webers have progression circuits?
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mb911
post Jan 14 2023, 05:30 PM
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QUOTE(r_towle @ Jan 14 2023, 11:43 AM) *

I’m a bit confused.
Newbie to modifying a 6 here, but I have webers and will be doing some sort of fuel injection going forward due to car sitting for months in winter, not DD etc etc

So, mine is a 3.0 that I assume was using the old FI, but that is all gone.
Motor came with webers.

My question is, can I follow you, copy you, without modifying my heads in any way? I’m happy to get adapters for the injectors…but I’m concerned with head changes.



Sorry you would need MFI heads to do this or some machine work
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mb911
post Jan 14 2023, 05:30 PM
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QUOTE(rhodyguy @ Jan 14 2023, 03:04 PM) *

What becomes of float bowls and other carb related items? Does everything other than the vac ports you’re putting in get plugged? Do the triple Webers have progression circuits?



Just plugging the fuel inlets. I might remove the floats just so they don’t rattle.
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mb911
post Jan 16 2023, 04:42 PM
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Went a different route on vacuum tubes. Drill .100 hole and used 3/32 brass sleeved inside 1/8 brass and used loctite 638 cylindrical bonding and pushed them in the holes and for good measure so epoxy on the outside. Then connect the 1/8 vacuum tubing only to realize that I need to run individual lines to a manifold to ensure no reversion. I did also start on the injector harness as well. Attached Image
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mb911
post Feb 11 2023, 07:30 PM
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Equal length vacuum lines and manifold for a clean signal. Making headway Attached Image
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