I have searched the forum up and down and have not found any info regarding the conversion from the 3 BBL throttle body(stock) to a large 1 BBL (for example - Ford Mustang) Has any body ever done this or know of any body who has done this, if so...what was the results, how did it idle, cruise, accelerate...ETC.

 

Ya know bastard, lately i've been thinking about this myself. not anytime soon but soon i'll have a project motor that i can do whatever the hell i want to it.

But yeah I was also curious if you could perhaps find a single barrel carb to fit on the 7.

 

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Is there anyway to delete your post? I was going to upload a picture but it's too big. Can anyone tell me how to make the picture smaller?

-Destin

 

try the "resize" option, most programs have them, but if not, then copy it - and when you paste it, hold shift and resize it (holding shift keeps it in the same ratio)

but anyway.....


Why would you want one huge inlet? You'd lose torque - two medium-sized throttle-bodies would be the lowest I'd use. but I'd be tempted to use one for EACH port to maximise air control and torque

 

One big one would also make you lose throttle response.
While the one you mentioned for each port would give you amazing throttle response.

 

I couldn't get the pic to transfer any smaller. Oh well. 1 big throttle body allows more air top end than the 3 butterfly valves or an individual throttle body setup. ITB's are better for response but 1 big throttle body is better for drag.

-Destin

 

Is the image a BITMAP if so... save it as a JPEG

 

It's jpeg.

-Destin

 

I can see how 2 smaller ones would give better throttle reponse if they were staged. One barrel being primary and the other a secondary cuircut that started opening just off idle (somewhere around 1500 RPM). Say you had a TB with two 50MM barrels opening at the same time wouldn't that be like a 100MM single BBL TB opening???

 

ummmm.... πr^2 mean anything to you?

 

Ummmmmmmmm ....No, It means nothing to me

 

hey head, you lookin for this one?

 

found this on another site..there was no information about it other then it fits a 12a

 

I was thinking about posting that but it was a little dirty. I had some up to date pics that where all shinny and cleaned up but can't load them because there too big. But basically the same pic. Anyways it's a 90mm TB from an Infitinit Q45. Personally I can't see why it's being used at my power level. I don't think it's a benefit at all. But I don't know.

-Destin

 

I had a single plate throttlebody on my old 2nd gen. I posted pictures of it here and took lots of flack over. Lots of idiots, some of them who are strangely enough the supposed smarter people here, were telling me that it couldn't work and why it wouldn't work well. I was actually driving the car around though so I knew better. Watch out for these sceptics. Everybody asked for dyno charts to prove it worked but I really didn't care enough about them to get it dynoed. I will tell you how it drove in comparison to the stock system.

This was on a nonturbo car originally. The lowend power decreased but the top end increased. Throttle response was much faster and maybe a little touchy and sensitive at part throttle. Gas mileage went way down due to lack of port velocity at low rpm's. It was a play car so I didn't really care that much.

One thing everyone forgets is that a single plate is not a direct comparison to the total area of all 3 plates on the stock throttlebody. Remember that the dynamic chamber is a dual plane chamber. The single primary throttle plate feeds the 2 primary intake ports while 2 secondary throttle plates feed both of the secondary ports. The flow capability of the primary plate maxes out faster than the secondaries. Imagine how bad this is on a 20B! By replacing the stock tb with a single plate, you now have an equal amount of air available to all of the ports. While this does nothing for low end power, it does help with top end. The downside is that at low rpm's and part throttle, all of the intake ports have air flowing through them and port velocity is slower. The stock throttlebody is setup so the secondary plates don't open until you are at 20% throttle or more. This keeps air velocity high in the primary ports and helps low end power and gas mileage. That is the advantage. If you want street drvability, I recommend to keep it stock. If you are trying to get every last little bit out of the engine on the top end, go for it.

 

Thank you ROTARYGOD, that was a great post...I would love to hear more about your setup...How large was the throttle body, how it attached, what the cable linkage looked like, Did you have the oil pump meter linkage hooked up?. Do you have pictures?
-g

 

It was a 75mm Mustang tb so it was too large for nonturbo use. It was intended for my turbo car though. I used the stock dynamic chamber but cut it in half and hollowed it out into one chamber. Then I rewelded it together and welded on a tb flange. It took alot of grinding. I have a modified T-II plenum lying around somewhere. The cable linkage was really just straight forward. The oil metering was mechanical and took some creativity. I used a bicycle brake cable to pull it open. Works like a champ. Unfortunately I don't have pictures of it on the car or completely done. I do have pictures of the setup but they aren't pictures on the car. PM me for any more details.

 

Very informative Rotarygod!

I`ll be using a Series 5 13B Turbo manifold on my 12A in the near future.Converted the TB to single stage,to make it easier to set up.

Hopefully it will work well.

Karis

 

Here is another setup i was thinking about...I would have to figure out how to mount the upper half to my S4 lower, unless someone knew of a lower half that would mount straight to the block and upper? This set up with the factory TII lower would give me 4 additional injectors...some serious fuel