Hilborn 2 and 4 Port 6-71 Injection - Need Info

I have questions! I didn't see what I was looking for doing a search, so maybe you guys can help.

First general question: is there a difference between 2 and 4 port/throat 6-71 injection tops that are used in the upright position vs. horizontal position, as used in a Potvin application?

Next question: what is the intended difference between the 2 and 4 port/throat injection manifolds? Do they flow the same but simply offer a lower profile in the 4 port arrangement? Or were they really intended for 2 totally different applications?

Third question: are any of you running an EFI converted vintage injection top?

Forth question: any chance someone would have dimensional information? (Port size, length(s), injector locations and size, port centers, etc.) An accurate 3D CAD model would be REALLY cool, if anyone has cooked one up that could be dropped into a mock-up assembly.

and last but not least: to make this thread less than boring, let's see some 2 and 4 port 6-71 setups!

And for those of you that have been under a rock and have no idea what I'm talking about, here's a couple reference pics...

 

No real different in vertical and horizontal just mounted different. They don't care they have no float bowl.

8th grade genious ran a 4 port on the injected small block in his Willy a few years back, he probably has a lot of insite into them.

 

Thanks p-beaner! I figured it wouldn't care one way or the other, just got to thinking about orientation of the injector itself.

 

Call Hilborn, they will answer most of your questions!

 

[FONT=arial,geneva]WEST COAST OFFICE & FACTORY
For mechanical systems sales and support[FONT=arial,geneva]
Address: 22892 Glenwood Drive, Aliso Viejo, CA 92656[/FONT]
Phone: (949) 360-0909
Fax: (949) 360-0991[FONT=arial,geneva]
Office Hours:</B>[/FONT] Monday - Friday 9:00am - 5:00pm PST [/FONT][FONT=arial,geneva]EAST COAST OFFICE - EFI SPECIALIST
For EFI sales and support
Phone: (215) 643-4607
Fax: (215) 643-4608[/FONT][FONT=arial,geneva][FONT=arial,geneva]
Office Hours:</B>[/FONT] Monday - Friday 9:00am - 5:00pm EST [/FONT]

 

True. I could to that. But, I seriously doubt they're going to talk to me about converting an older injection body (without asking for my credit card number first), and I feel pretty confident they wouldn't offer up much in the way of dimensional information suitable for CAD recreation. So may as well ask all the questions in the same place... for now.

Besides... this could be a good discussion here, for those experienced and/or interested. And who doesn't like discussing fuel injection?

 

I just had my 4port converted to efi, its on its way to me from the east coast, ill post pics when I get it, look up Fran from fox engineering, he is out by you

 

If you are looking to convert it to EFI, you might consider talking to Fran Olson at Fox Engineering:

http://www.foxinjection.com/hilborn-enderle-efi-kits.html

oops! I'm slow-

 

Well make that 3 for fran, I don't know him yet but I have heard good things about him and no bad things.

Scoot,
I wish I had more information to give you. I have played with one that needed to be made to run but I don't have enough knowlege to give you dimensions or have one to measure for you.

 

Yep! Fran lives about 20-30 minutes from me. I hear great things and have been meaning to stop by. BUT... Prices are big. Plus, it's seems like something someone could put together with the right tools, parts recipe, and know-how. But, that's a whoooole nother topic, unless someone want to show how it's done.

Here's a loaded question... Anyone MAKE a 2 or 4 port injection body for a 6-71 from a block of aluminum? Always wondered about something like that. Doesn't LOOK terribly complicated to machine, from a functional stand-point (neglecting exterior non-functional details of the body that would be better created with a casting process).

Marknkimberlys29, what are you planning on using for a controller for your EFI? Like a megasquirt or something?

 

I'll bet that Enderle, hilborn and alagon all did at one time or another.

I don't see any machining problems with one. Just take your time. It would be nice to have one for a pattern.

 

We are going to use a FAST system, my buddy is a master tuner and he likes those, BTW, Frans price wasn't bad for everything he did

 

Fran Olsen is a great dude ! & Major hemi nut too. He built my blown hemi
Took me for a ride in his Lamborghini powered t bucket.
Take ride and go visit. You guys will shoot the shit for hours

 

Im happy to hear some fellow HAMBers know him, he was great to deal with

 

Yep! My thoughts exactly...

 

Brandon

 

check with alkydiggers.com they have some cool stuff

 

So who else made these types of injection bodies for GMC blowers? Just Hilborn? I couldn't find much else on Algon having made one and Enderle appears to be an entirely different design.

 

Scoot,
Didn't SCOT make a 4 hole upright? I think it was the type that was on the "Mad Max" Falcon. My old boss has one high up on a shelf in the back of his shop. (Edit: Nevermind, it looks like all the SCOT units were barn doors, although I did see a pic of a 2 port)

I think the 4 hole design was to cut down on the height of the injector (don't need as much room to swing the smaller butterflies). The Hilborn ad in your OP lists it as the "low profile" design, anyway.

As far as getting one in billet, contact Dzuari. I'm sure it's on his "to do" list as soon as he finishes the 6/71 blower. He may even have a Solidworks model of an injector done up already.

 

Thanks for the input! And yeah, it seems the lower profile 4-port would make sense. Doesn't seem like it would matter how tall the body is as long as it could flow the same volume. Is that a false statement? Is there a boundary layer/fluid dynamics recipe that says the body should ideally be a certain height to mate well with the mouth of a GMC 6-71 and it's rotating assembly? Can't see why it would matter as long as it flows, the injectors can squirt, and the butterflies can open. Fill me in if there's things to consider.

I've just really been thinking this would be a fun machining project. I only need one and there's not a whole lot to it, that I can see.

 

FWIW, a guy I know wanted a 4-port-look EFI. He said most of the old Hilborns he found were high priced and/or clapped out. Instead, he used four Ford EFI throttle bodies, mounted them tight together on a single billet baseplate, connected the throttle shafts with set screw couplers, modified a four-hole scoop. Most under fifty years old are convinced its a Hilborn. He's a talented guy, but he had next to no money in it; pick'n'pull parts and some machine time. I'll see if I can get a photo.

jack vines

 

I was thinking about this also! GREAT! I would love to see the setup. If nothing else, it might be cool to rob the working parts off of it and machine up a nice single 4-port body. Very cool idea, though. Let us know if you can find some pics...

 

Yeah, I'd entertained the same thought with 2 of the dual Ford pickup TBs.

As far as the "correct" height for the injector, remember the GMC is a positive displacement air pump. That means it's sucking as hard as it's blowing. As long as you have a big enough hole, it will flow the same.

 

EXACTLY! That was the assumption I was making...

 

Scooter why wouldn't you just ask me? I have all of them including the original potvin. Check Kenny's page the potvin is on there. kenny@ gbones32coupe. Goldy

 

Really, give Fran a call. You wont find a nicer guy to talk with, and he wont ask for your credit card number. Tell him I said so.

 

Goldy!!! Hey buddy! Oh man... I don't know why I didn't think to ask. Geesh... Been following Kenny's build too. I'll shoot you guys a message. Is email or PM best? I never know which to chat with you at...


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bring it back form the dead. really hoping to see some more info on efi conversion

 

Well like scooter was saying earlier, just some general dimensions are needed like bolt patterns(top and bottom) and bore spacings, injector nozzle locations, etc...

 

Ill post up some pics of my Hilborn that I had Fran modify, hopefully tonite when I get to my home computer. It has 4 injectors on each side plumbed with stainless hard lines