simpson36

New toys!

I still need to finish up the Offenhauser thread, but I'll be coming back to detail this dual quad setup and have lots of photos of how it came to be.

For now, just a pic of the finshed project, recently shipped off to it's owner in Canada.

simpson36

OK, here's the story from the beginning:

A fellow found me by reading a thread I did on converting Crossfire TBs to use a single IAC motor. He was planning to put two TBs on an in-line dual quad manifold and needed to get rid of one of the IACs.
As we talked about the project, it got interesting to me and we decided I would help out with some TB mounting plates. One thing led to another.
The objective was to put these:

on this:

The owner send me the manifold and as soon as received it and stared at it for a while, it occurred to me that the best placement of the single throttle plate of the 4 banger TB would be here:

So I took some measurments and because of interference btween the manifold and TB bolts, I could not quite get where I wanted, but within about 1/4" was good enough:

Now to make the adapter for the other TB with the same relative location:


Next post . . mount TBs and fab linkage.

simpson36

Looking at possible linkage options. This is just nasty. Dropped this idea in a hurry:

I'll get back to that later . . moving on to the TB mounting we think we're cruising along nicely.
Oops, find a new problem distibutor clearance:

No way, Jose. OK, spin it 180 and try again. Better, but still might be a problem. Communicated this to owner in Canada:


Hmmm throttle brackets?:


Got the scoop on the dizzy and . . well . . if we want to have a distibutor CAP, we have an isue here:

Solution:

OK so far so good. We've got the TBs situated and have started thinking about the fuel setup a little bit. Time for a couple beers:



Next post . . linkage . . should be a pice of cake . . right?

graebz28

iTrader: (5)

The work so far looks awesome. What hp range are you expecting with BBC injectors?

simpson36

The pair of bored TBs are touch over 900CFM, and the manifold is single plane and friggin' huge.

The HP would depend on the motor, of course, but you have the capacity to go over 500 HP with 900 CFM I would think.

simpson36

Linkage for this project turned out to be quite a challenge. The owner had already done a beautiful job modding two Crossfire rear TB arms for the linkage so I used those.

The tie bar had to be on the right side because of the orientation of the TBs and the throttle had to pull from the left side because of the cable routing. That meant the shaft had to be longer on the cable side to mount an arm on it.

I considered adding an extension to one of the stock shafts, but decided it would not be reliable enough. I like everything bullet proof, so it looked like I'd have to make an entire new shaft.

Start by cutting a length of 3/8" dia steel rod and prepping the end to receieve the arm:



Next, remove the arm from the original shaft, put it on the new shaft and peen the end over . . to match the original shaft. Note the original pull stud has already been ground off at this point:



Now we need an arm for the throttle cable and trans TV cable on the other side of the shaft . . . Hmmmm . . well, sometimes you just gotta have some bling:



OK, actually it was not just a matter of bling. Modding a stock late model TB arm would have been as much work and would have looked pretty mangled up by the time I got it to fit and clear the manifold.



Throttle shafts of course have throttle plates, so there's a little more work to do. Note that I had to also cut the original shaft for the new bigger plates and then knurl the original shaft to bring the diameter up to .375" for the ball bearings:



The completed new shaft:



Can't attach a tie bar to a throttle stud, so the stud ends were grund off, and drilled and tapped for a new threaded studs to mount the little stainless steel rod ends. Cute little buggers:



In order to balance this setup, the two rod ends are opposite thread . . like a turnbuckle. Balance is achieved by turning the hex tie bar. Here's the completed setup:



Once the TBs were moved apart, there was room for both IAC motors, but by the time we got to that conversation, the owner had impaled himself on the idea of a single IAC, and wanted to keep that mod in the project.
That's a very interesting mod . . . up next . . .

simpson36

I made a separte thread out of this one so detour over here:

https://www.thirdgen.org/forums/tbi/...ml#post3845829

I'm not going to cover the injector pod build and mods here because I have a tech article on that.

So . . next up . . fuel system

KITT1983

iTrader: (3)

Any updates?

Wife'sCar

iTrader: (1)

After almost 7 years I'm doubting it. But it was looking pretty good, kinda dissapointed to read to the end and then see how long it's been since last post.

3rdgenmaro

iTrader: (9)

Considering he last logged on 6-5-12......................