hey guys, just got done with an exam this morning, but i believe i killed it.

anyway back to my idea and questions.

i have an old school offenhauser dual quad intake that i got from a car show. it is in really nice shape and the looks are killer.

but it is of course for carbs. how would i go at modifying it so that it can become fuel injected? i know i can go TBI but i would like to go with port injection. do the injectors have to be aimed a certain way? or can they just go in at whatever angle is convienent?

i am thinking of having each tubo have their own throttle body and intercoolers.

i am off to take a nap

later
andrew

 

optimal is pointing toward the intake valve but I have seen some straight up and down. spraying the fuel straight down, causes poor fuel delivery at low speeds (idle) quality suffers. but in really short duration, wide lope sep cams with little overlap it seems to be less of a problem. the answer is attempt for the easiest angle to achieve without killing yourself

 

do something similar to this:

http://members.telocity.com/~89proch...oc/intake.html

 

that is how i would do mine, but with two throttle bodies instead.

i don't know how far toward the valve i can aim the injector, but i think i can get pretty close, have to look at that next time i am home.

thanks

andrew

 

why two TB's?

 

because it is a dual quad intake, and if i use it i don't want to loose the nostalga of it. i could make an upper plenum, but too much work

i am going to take a bunch of pics this weekend and you will see what i am talking about.

 

in your case I think THIS SYSTEM has serious merit, Im even curious how it would run on a roots

 

Your intake looks great! Did you do it yourself?

 

I was just thinking about something, would tuning a setup like that not be a complete pain in the ***? I mean with each turbo feeding its own TB and everything. maybe its just me being ignorant of a system like that....

 

Wish i said i could

Honestly...i was going to do most of it myself. The same shop that did this particular conversion was just going to drill the holes for me and i was going to have a good bud of mine who has tig welded with aluminum for over 10+ years weld it in and i was going to finish grinding away the injector bung and do the fuel rails.

BUT

i was running out of time to do and knew that it would be less headachne and turn out nicer if i let this shop do it. They run a small machine shop out of their garage but they do a ton of stuff for one of the top supra tuners in the country (aka Sound Performance) and they also make the billet LS1 fuel rails available through www.ls1speed.com

I asked them if they could get it done for me and with everything you see in those photos with me supplying the fuel rail and bungs which cost me $60 total i paid $410 for what you see. $350 in machine/welding and $60 in material.......that also includes the milling of the elbow and the intake itself

Almost every place i called up wanted between $400-450 for just the conversion ALONE and that didn't include any milling and i guarrantee it didn't include the cool way they mounted my fuel rails

 

ahh.... well now I'm discourged!! Maybe I will try ordering the Accel

Scott

 

inside of the intake the whole bank of 4 ports can see both carbs.

inside it splits the two banks from each other.

i would do it this way because i believe it may be easier to locate two small intercoolers much like the way on the sticky at the top of this board.

one of my goals with this project is to be able to make the turbo setup a somewhat clean install. if it even takes modifying stock parts, i believe the extra effort will be worth the outcome.

tuning shouldn't be a problem if i were to go port injection. i like the idea behind the tbi quite a bit tho, i am gonna give some serious thought into a setup like that. i may want to see how i can make one myself using junkyard parts to bring the cost down. i really want to get this thing going.


later

andrew

 

Dont be......the only things you really need to get this done cheaply is:

1)drill press
2)someone who can tig weld aluminum very well
3)$70 in material
4)3/8 NPT pipe tap
5)37/64" drill bit
6)machine shop to drill holes in intake

you need #1 to drill the holes in the fuel rail.....its quite simple actually, just drill it to the size you need and then go up one drill size to chamfer the hole

you need #2 to have someone tig weld in the bungs and actually to do it even CHEAPER they make some bungs that you can EPOXY in

you need #3 for the injector bungs and fuel rail. I got the bungs from youngs perforance for $40 + shipping and i got the fuel rail from force efi for $10 a foot (both were the cheapest i could find for each product)

you need #4 to tap the fuel rails to 3/8 NPT to use a -8 to 3/8 NPT fitting on the fuel rail

you need #5 to drill out the hole slightly on the .500 inner diameter fuel rail to be able to tap it to 3/8 NPT

you need #6 obviously to drill the holes on a bridgeport to set the bungs in

----Only thing left to do really is after the bungs are either epoxied or welded in, grind down the excess in the intake port and also figure out a way to secure the fuel rails. So as you can see, this can be done with some inginuity for pretty cheap

 

get a weiand, they have an awsome selection of SBC EFI capable manifolds, (with the bungs cast in), I will try to find my catalog, and scan. many of the part #'s are still available. the manifold used in the 950 kits his horrible, I owned one made by haltech (I think it was) and sold by "force" (force is a good place though). the accel is $mucho dinero$

 

that interesting!

Yea if you could get some part number that would be great I searched weiand's site and got "that page no longer exsists"

I found the Accel for 356.00 @ summit (no fuel rails) take 2- 3 weeks to get

The Holley is about 250 @ summit (no fuel rails)

I'm still thinking of doing my own I have a good friend that does awesome tig welding!! I guess I need to talk to a machine shop. I'm not really trying to be cheap, just think it would be kinda cool to do my own!!

Is PTE the only people making that 90* elbow?

Thanks scott

 

build yours, or buy the weiand, I will work on it.

 

Wilson Manifolds also makes one and i believe there are a few companies out there like Youngs Performance and Livernos Motorsports that sell sheetmetal elbows also

I have BlownBird's old PTE elbow and i had it cut down significantly to clear my stock hood

The only reason why i didn't go with the accel manifold is because i wasn't sure whether or not there would be enough room on the ports to fit my track 1 head where with a victor junior i knew there would be and it still comes pretty close to the port roof

 

would it be possible to use a tpi fuel rail out of a junkyard???

from what i can remember the runners were pretty wide and i belive i can make a TPI rail fit.

 

The problem is that the spacing for the injectors is probably different......

It isn't hard to make your own fuel rail at all

all you need is a drill press really and some bar stock fuel rail

By about 2 and a half feet of rail @ 10 bucks a foot and make your own

Mark on the fuel rail where the injector is going to sit and drill a small hole. Then do the same for the other three. If you are off some it is ok because the hole you drilled is small enough so that you can move it over some without screwing up if you get my point

Then when you get about the size you need, go up one bit size and chamfer the hole and you're set

Then you need to drill out the .500 inner hole of the fuel rail to 37/64" and tap it for 3/8 NPT

boom done

 

okay it doesnt sound that bad anymore.

what size drill bit do i need? or are injectors different sizes externally?

for the injector bungs, you drilled out a hole and then welded in the bungs ontop of that?

 

the weiand part# is 9901-119 and price is 342 W/o Rails. But he said it "should" be avaliable for shiping nov 1. That sounds like to me it could be nov. 1 or nov. 1 2003-04-05 who knows!

This guy also does the conversion. he has some awesome pictures. He quoted me 550ish for a victor jr.

http://kevthompson.homestead.com/intakesEFI.html


Scott

 

Wow, some nice stuff there but $550 is a lot in my opinion

If you would like i can give you the number to the place that did mine