EFI kits for our engines

[Greg]

With all the troubles tooning the Holley Weber 5200 (32-36) carbs and potential for switching carbs if upgrading to one of the new aluminum heads has anyone looked into throttle body fuel injection?. I was searching the web and came up with http://www.customefis.com/index.html. At about $850 might be an option for some. Any comments on the idea? I figured it would be like having a perfectly tuned carb. I was also thinking it should be able to grow with engine modifications.

Since a TBI system uses injectors instead of venturies is are there still problems if you use too big of a throttle body planning for upgrades. I assume upgrading injectors would be the only issue.

Greg

P.S. I recently purchased an electric choke ("Choke Thermostat") for my Holley/Weber 5200 from Advanced Auto. It was from a 1980 Mecury Capri 2.3L SOHV engine. GP Sorensen Part Number 7791399. Cost $26. You will however need the 3/4 circle metal piece for the electric choke mounting. This mounting piece is not included and I'm not sure where to get one other than from another electric choke Holley Weber carb. I'll post picts when I get time to download them from my camera....

 

[Greg]

Ok I guess no spaces allowed in links. P.S. Cliffords Redline system looks too expensive.

http://www.customefis.com/index.html

 

[Anlushac11]

8)

IMHO sorta, if you have a large TB it is like having a larger carb opening. You will probably see a sizeable difference in mid range and top end but you may lose some low rpm response and torque til the rpms increase and the airflow pics up.

I know several people who gut the 2.3L Mustang EFI intakes and my dad bored the TB on his ZX2 and ported the intake. He lost some low end performance but in his words "The mid range and top end reponse more than make up for it".


Also just my opinion but I would rather buy and build a megasquirt kit and get the needed parts used or from a yard before I would plunk down $850 or more for a out of the box TBI setup.

IIRC Megasquirt kit costs about $150 and hte parts can be had from a yard for probably less than $100.

If you cant build a Megasquirt your probably looking at about $75 for someone to build it for you.

 

[Greg]

Has anyone done a Megasquirt's setup to a Ford I6? How hard was it to setup? What additional parts did you use (TB, sensors, etc.)?

 

[Anonymous]

Machining the intake to accept six injectors would be the hardest part. Everything else is easy.

 

[XFlow_Fairlane]

linc-

I was thinking that the angle of the injectors would almost be vertical on the head. would be pretty easy to get some weld bungs and drill the head to take them and then epoxy them in place.

 

[CobraSix]

I have a spare Aussie intake manifold that I've look at for modifying for a MPFI set up. It's one of those "on-hold" projects while I try to clarify my vision for my engine set up. While part of me would like to go MPFI or EFI in general, the carb is nice, simple, and not prone to weird electrical issues.

Another option I may look more into is building an EFI manifold insert for the Aussie head. Biggest problem is space as I only have 2 inches between the end of my manfold and the shock tower making it a very tight fit to get a TB in there if I move it out for an injector manifold. I got that idea from some of the older BMWs that have EFI set up that way.

Slade

 

[LaGrasta]

I'm really tired of only getting 16-19 mpg. I thought the efi would be a smart idea. I have an aussie head sitting in the garage. hmmm...

 

[Anonymous]

linc-
I was thinking that the angle of the injectors would almost be vertical on the head .

I was thinking mill flat the outside of the log and bolt on a machined aluminum plate. The injectors would all be in that, horizontally, spraying at the port.

If I have some time I will make a prototype and post pictures.

 

[pedal2themetal45]

linc-
I was thinking that the angle of the injectors would almost be vertical on the head .

I was thinking mill flat the outside of the log and bolt on a machined aluminum plate. The injectors would all be in that, horizontally, spraying at the port.

If I have some time I will make a prototype and post pictures.

I don't think putting the injectors in the manifold on the outside of the log would work very well.... I think between the intake and the head would be better as the incomming air would pull the fuel past the injector in to the cylender. Where just putting the injector in the outside edge of the intake would be harder to get a good fuel mixture... just my .o2
Tim

 

[CobraSix]

I'm really tired of only getting 16-19 mpg. I thought the efi would be a smart idea. I have an aussie head sitting in the garage. hmmm...

Something is off. I was getting 27MPG on my autolite 1100 with the T5 transmission and 24-25MPG with the old 2.77 3 speed. My aussie gets around 24-25 MPG oon the highway since I can't seem to keep my foot off the gas.

Slade

 

[Anonymous]

I think between the intake and the head would be better as the incomming air would pull the fuel past the injector in to the cylender.

I was just thinking of "keep it simple". If you ever see an injector spray, I don't think it would be too much of a problem, but you are right, air flows past the injectors as it travels along the log.

Sequential EFI is less of a problem, but you may have problems with simple "batch fire" injectors where they all spray at the same time.

Something is off. I was getting 24-25MPG with the old 2.77 3 speed.

Agreed, something is way wrong if MPG is that bad. My old 170 Maverick had no compression and burned a quart of oil every 100 miles, and I still got 27 MPG with 3-speed and 3.00 rear.

 

[LaGrasta]

My car runs so great, but I guess something may be off then.
I have a rebuilt 2 speed and an 8" rear running 3:00 gears (IIRC). I have a 2:79 center section in the garage if I ever decide to use it. My ignition is pertronics running at about 25° (IIRC). I know that's really advanced, but I pushed it until it pinged, then backed it off and it runs like a champ. No overheating either. I have about 17-19 lbs vaccume (IIRC).
One factor that may be different than yours is I drive about 60 miles a day to and from work, all highway. I cruise at about 70--75 mph.

 

[Nathan289]

Take a look at a 4.0L jeep manifold.
I would imagine that you could make a manifold like that to bolt up to a Aussie or new aluminum head.
Hasnt someone here modified a jeep set up to work on an I-6 and said the head wasnt worth the outcome??

Nathan

 

[CobraSix]

My car runs so great, but I guess something may be off then.
I have a rebuilt 2 speed and an 8" rear running 3:00 gears (IIRC). I have a 2:79 center section in the garage if I ever decide to use it. My ignition is pertronics running at about 25° (IIRC). I know that's really advanced, but I pushed it until it pinged, then backed it off and it runs like a champ. No overheating either. I have about 17-19 lbs vaccume (IIRC).
One factor that may be different than yours is I drive about 60 miles a day to and from work, all highway. I cruise at about 70--75 mph.

Those figures were me driving 40 miles one way to work every day, top down or from 300 mile road trips. 3.20 open rear end. Until this year my car was a daily driver. Now I am still working on brakes. I'm hoping to at least get it on the road before it snows if only for a short trip around the block.

You advance may be hurting your mileage some. I know people like to push that, but personally, I keep mine at 8-10* to stretch the mileage out of it. 1-2 more HP to me isn't as good at 2-4 more MPG. But that is just me.