EFI- single dual throat throttle body preview

[beast02er]

I'm procrastinating right now, so I thought i'd show some pics of my future EFI set up. Right now my Megasquirt is being a BI**H and has a short somewhere, my electronics major friend couldn't even find it, so I don't know what to do with that right now. The plan is to use the single weber sidedraft manifold like pictured, cut holes in the runners to put injector bungs (not in picture, but done now), and then i'm making a basic air valve sort of like the one in the picture, except the aluminum bore part will only be 40mm long, and then i'll have nice long curved carbon stacks coming out of it.

The TB pictured was a study I did 2 years ago. Its based off Weber parts. It would of been cool to use, but the aluminum tube I used had too thin a wall, so when I clamped on it to do that machining, the bores got out of round. So with the 40mm butterflies in and closed, there are some slight air leaks around the butterfly which is not good. So they are pretty much cool looking paper weights right now, prototypes I guess you could say. For this set up I'm doing I was planning on using a Lynx manifold, but we all know the deal about those right now. This one came up so I snatched it as quick as I could so I could get the project rolling.

Later,

Bryan

red73

[oz_tom]

(nt)

[Guest Anonymous]

Has anyone done an injection system using a single injector going through the side of an Exhaust Gas recirculation port with the carb plate capped off?

[dapbmw]

in europe or from twm in california......they bolt in direct to your weber side draft manifold. you can also get the tps potentiometer.

[Guest Anonymous]

(nt)

[Guest Anonymous]

Just tried to google TWM & couuldnt' find it. Do they have a web site? I want that manifold. I didn't know it was available but I think it would be great to run one 40 Weber sidedraft....

[oz_tom]

http://www.twminduction.com/Home/Home-FR.html

[Guest Anonymous]

(nt)

[2002maniac]

Looks neat. Have fun getting equal airflow to all 4 intake ports!

[Zenon]

Looks neat. Have fun getting equal airflow to all 4 intake ports!

Yeah, that's exactly what I was thinking.

To the OP: No disrespect 'cause I really dig experimentation, but... What problems are you trying to solve with this? It actually seems to be the worst of both worlds - very little of the low-rpm torque benefit of a common plenum and 4 long runners, and almost none of the top-end breathing benefits of individual throttles and independent runners. And then the manifold itself seems very uneven with the middle two cylinders getting a straight shot and the outer cylinders' flow having to do almost 120 degrees in bends and ~50% more length. One of the big advantages of FI is the flexibility in intake layout design it allows - so that each cylinder's tract can be identical - but that is apparently not being taken advantage of here.

That manifold layout reminds me of something for a BMC ex-irrigation-pump engine. [sideshow Bob shudder]

regards,

Zenon

[beast02er]

Well the idea was the mate the characteristics of a single sidedraft (lynx style) with the added bennefit of FI.... So unless all the people with Lynx are lying about how they perform, then i'm sure this should do just fine. The original plan was to use a lynx, but since those aren't really available I had to settle for this one for now. I'm going to do some flow bench work and try and even out the airflow to all throats if possible.

For those saying I can get TWM's, I know that, but why Pay $300-500 for one when I can make one for $50 and some time, and then be a little more different.

For the guy wanting to know where to get this manifold, I have no idea, I just bought it off a guy on the For sale board here. If you can, get a lynx as this one does seem like a pretty shitty design heh.

Bryan

red73