MSefi.com read only forum (Jan.15,2018)

Hi, I have a 63 Falcon with a 200 CID inline six with the head modified to mount a weber DGAS or DGEV directly. Now I want to try building a throttle body injection for it and the main candidate for the TB is the GM TBI. Does anyone know of a weber to TBI adapter plate available off-the-shelf? If not, has anyone made one, and do you have a schematic handy?

I am also open to alternative suggestions for throttle body injection systems.

Thanks,
James

Anybody? I can't be the only person who has gone down this road.

Just guessing, you may be the pioneer on this! I've a little (very little but my creation works fine) experience in fabbing up something similar. If you're interested in that approach, let me know and I'll post my trials, tribulations, what I did and, most importantly, what not to do.

-Mike

I do not know of any plates, but we made one for a Fiat X1/9 that uses a similar carburetor.
We drew the bolt patterns for the carburetor along with the opening in the intake manifold on paper. The intake manifold had a single plenum – just a large hole as opposed to a dual plane set up. We then added the outline / bolt holes and openings for the throttle body (early 1.8L Subaru unit – fit our flow rate and space constraints). The bolt holes for both units did not overlap, which made the rest pretty easy. Because it was easy to do and we had the time, we made one from a block of wood to check out the space constraints. We then took the drawing to a machine shop and they used a ~ 3/4 “ block of aluminum, drilled all of the holes and counter sunk the bolt holes half way so that the bolt heads were not in the way. Cap screws would have been a better choice, but we had lots of room between the different bolt patterns, so it did not matter too much. We did not spend a lot of time working on the inlet / outlet smoothing, for what the car was going to do, it did not matter. It was not real pretty, but it did the job and was quick. End result was similar to some of the Weber conversion kits I have seen. After the conversion to fuel injection, the car ran much better.

Just using the gaskets from the manifold and the throttle body should make a pretty quick template – if the bolt holes clear with the center bores lined up, it should go pretty easy. Try to take into account where the throttle linkage is going to connect to make the final installation a little easier.

- Charles.

Thanks, pretty much what I figured. i just picked up a gasket for the TBI last night, so this afternoon I'll get my other gasket and some paper and get to work. I guess I'll mock up some wood versions and then have the machinish make me one. I also have a slab of corian, which might make for an interesting phenolic version. i wonder how it holds up to heat...

The Fiat had a phenolic spacer originally in there. This is a mid-engine car, it gets really hot in the engine bay. I think the spacer was in there to help keep the carb cool. There was also a fan to blow external air on to the carb after it had been parked for a while.

http://www.sdplastics.com/phenolic.html
These folks indicate that depending on the type it can run 250 ^F continuously. Not sure what the inlet manifold temperatures are... water jacket is at 200^F or so.

Here is a little more information on corian from DuPont:
http://www.centerdesignbusiness.org/par ... index.html
Interesting - I did not realise that it was a thermal plastic - nice for protoype work. Looks like the temperature may be a little on the cool side, but it might work just fine.

- Charles.

Yes, 300* seems low for extended use inside an engine compartment. Especially on a ford inline where the intake sits above the exhaust manifold. At any rate, I've revised my plan to begin prototyping by using a Ford Tempo throttle body. It's smaller than the GM unit and only has one injector, so I seriously doubt I can take it very far in terms of power, but I'm hoping it'll be good for around 175 with the right injector. In the meantime, it'll be much easier to implement, and I can always upgrade to something bigger once I get the basic fuel system and management operating properly. Here is a nice example of the type of setup I'm looking to duplicate:

http://fordsix.com/forum/viewtopic.php? ... &start=200

Check out

http://www.tdperformance.com

They had the adapter I needed to mount a GM TBI to holley 2300 2bbl carb. (I mounted a GM TBI to a Ford 351W )

I >think< I used P/N 2204.

How goes this project? I haven't shopped (the salvage yard) yet, but I'm headed down the same road. Webber DGV to TBI.

My application presents the problem of limited height above the manifold, so I need to find something that is as low-profile as possible. Aside from that, it should be pretty simple.

Loren,
The Fiat X1/9 (1.5L engine) had the similar height constraints. We went with the throttle body from a ~'85 - ~'90 Subaru 1.8L single point fuel injection setup. It had a nice bend in the air duct to keep it flat over the top of the throttle body. Worked very well for us - the car has been using it for years and never misses a beat.

- Charles.

Found a brilliantly simple solution last night, I think. Similar single-barrel TBI from an 87 Ford Tempo. Better still (for me) is that it will bolt up to a stock Spitfire (sidedraft) manifold VERY easily, thus eliminating the height clearance issue altogether.

So, I don't have to use the Webber manifold and can sell it complete with the carb... more money back in the budget!