Quote from GrIp DrIvEr :

Also, they are not called butterfly flaps. They are called throttle something (I will research that), and they help the engine get air through the scoop for more power.

Just like every single other piece of a car, they have more than one name. In North America, they are normally called Butterflies, and they do not 'help the engine get air through the scoop for more power.' They close during throttle-off to keep air from forcing its way in.

Quote from senn :

my question tho was, if you have butterflies on the blower hat, why do you also need them on the carby? (obviously some don't but there is pics about of those that do)Whats the advantage of having two sets of throttle bodies...

I've never seen this, myself. Seems odd to me, too. Anyone have an answer?

Ok. Consider what happens as the car is moving through the air. Regardless of the presence of the supercharger, the scoop is providing increased air pressure over the atmosphere (ram air effect). So, the butterflies on the scoop close as the carb closes to that this pressure does not build up. The result is that under closed throttle conditions, the carb will operate consistently no matter what speed the car is traveling.

Wouldn't that create quite a low-pressure zone inside the airscoop that would lead to damage in the supercharger and/or the real carburetor?

Quote from MAGGOT :

Just like every single other piece of a car, they have more than one name. In North America, they are normally called Butterflies, and they do not 'help the engine get air through the scoop for more power.' They close during throttle-off to keep air from forcing its way in.



I've never seen this, myself. Seems odd to me, too. Anyone have an answer?

really? I thought it was to just help the engine get more air. I guess I leared that ir CONTROLS air movement. Pretty cool, thanks!

Quote from bbman :

Wouldn't that create quite a low-pressure zone inside the airscoop that would lead to damage in the supercharger and/or the real carburetor?

I think they let a small amount of air in?

Quote from GrIp DrIvEr :

really? I thought it was to just help the engine get more air. I guess I leared that ir CONTROLS air movement. Pretty cool, thanks!

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funnily enough thats what i was taught too. Throttle body is essentially a restriction or control of the motors air intake (which is either physically or electronically linked to fuel input). Without it, would run flat out all the time..

Quote from senn :

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funnily enough thats what i was taught too. Throttle body is essentially a restriction or control of the motors air intake (which is either physically or electronically linked to fuel input). Without it, would run flat out all the time..

Yeah yeah yeah. but one more thing; I think it's a physically controlled thing. There are a lot of these engines that probably don't have electronic throttle.

yeah my old carby fed corolla all cable and linkages baybeh hehe dual throat carby induction noise ftw

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