butterfly geometry?
08-03-2008, 06:42 PM
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butterfly geometry?
Hey, here is a newbie question. What is the geometry of the butterfly valve in the throttle body? I was looking at the TB and since the butterfly rests at an angle it's either the butterfly that is an oval or the Tb is somehow milled in an oval shape? I tried to take it apart but could not get the screws loosened. Thanks. No wise cracks please.... 
08-03-2008, 08:49 PM
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It would be very nice if it was a circle. The reason why I think it might be an oval is that it sits on the wall of the TB perfectly. Chances are that the inner surface of the Tb is a perfect circle since it would be the harder part to machine if either should be an oval. Since the butterfly touches the circumference of the TB surface at all points it must be oval shaped??? That's what my logic tells me and I would like someone to confirm this.
The butterfly valve does not sit on an angle to let air in at idle, we have the Idle air control valve for that. If anything it is designed in such a way as to minimize the friction area between the TB surface and butterfly valve brass plate and possibly due to thermal expansion issues.
As to why I want to know this, I am designing an diy itbs setup. Previously I was going to use Hayabusa TB's, but after cutting the plenum I came to the sad realization that the ID of the tbs is slight smaller without a possibility for boring out. So now I am looking to make the TB's myself. I have access to all the required machinery(cnc, mills, lathes, etc..), but need to know the geometry before I burn some time with solidworks.
The butterfly valve does not sit on an angle to let air in at idle, we have the Idle air control valve for that. If anything it is designed in such a way as to minimize the friction area between the TB surface and butterfly valve brass plate and possibly due to thermal expansion issues.
As to why I want to know this, I am designing an diy itbs setup. Previously I was going to use Hayabusa TB's, but after cutting the plenum I came to the sad realization that the ID of the tbs is slight smaller without a possibility for boring out. So now I am looking to make the TB's myself. I have access to all the required machinery(cnc, mills, lathes, etc..), but need to know the geometry before I burn some time with solidworks.
08-04-2008, 07:32 AM
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sounds like a plan! you should def make a thread about it including all solidworks drawings etc. be very interesting!!
the intake will be circular due to easier machining(trying to match a perfect oval ID with butterfly....), uniform flow etc.
the intake will be circular due to easier machining(trying to match a perfect oval ID with butterfly....), uniform flow etc.
08-04-2008, 07:50 AM
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Originally Posted by Nickamsweet,Aug 4 2008, 11:32 AM
sounds like a plan! you should def make a thread about it including all solidworks drawings etc. be very interesting!!
the intake will be circular due to easier machining(trying to match a perfect oval ID with butterfly....), uniform flow etc.
the intake will be circular due to easier machining(trying to match a perfect oval ID with butterfly....), uniform flow etc.
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