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ed_ma61 Forums Junkie Location: Lost in the K hole Registered: May 2002	Re: Help needed with designing... Tue, 16 September 2003 15:41 What is the best Air horn ( / Trumpet / Stack / Bellmouth )? The air horn serves three main purposes; 1) To convert the pressure difference between bore and mouth into air speed with the minimum of energy loss. 2) To act as the interface between the induction system and the atmosphere, i.e. the point at which pressure waves change sign and direction. 3) To complete the system to the required overal length. For ease of description the air horn may be considered in two parts; the 'flare' and the 'tube'. The main job of the flare is to spread the low pressure zone over the largest possible area - to reduce local pressure reduction - whilst guiding incoming air into the tube with minimum disruption or induced vortices. The flare should be shaped to encourage air to enter from the sides, but not from the rear, of the mouth. This is acheved by either finishing the mouth with a sharp edge when the arc is a little beyond 90 degrees from the air horn axis or by folding material back, parallel to the axis, when the arc is at, or just below, 90 degrees to the axis. The main job of the tube is to accelerate the airflow smoothly and progressively. This is best achieved by an exponential shape - i.e. one where the radius of curvature is increasing constantly until the angle of the sides matches the next part of the system, usually the throttle body. At the intake end this should blend smoothly with the flare. It should be noted that the requirements for fuel injection and carburation do not always coincide and the best horns for one may not suit the other. [Report message to a moderator]

	Subject	Poster	Date
	Help needed with designing...	Jayem	Mon, 15 September 2003 15:35
	Re: Help needed with designing...	shinybluesteel	Mon, 15 September 2003 23:24
	Re: Help needed with designing...	Steve M	Tue, 16 September 2003 04:48
	Re: Help needed with designing...	ed_ma61	Tue, 16 September 2003 06:12
	Re: Help needed with designing...	oldcorollas	Tue, 16 September 2003 11:07
	Re: Help needed with designing...	ed_ma61	Tue, 16 September 2003 11:12
	Re: Help needed with designing...	Jayem	Tue, 16 September 2003 13:15
	Re: Help needed with designing...	oldcorollas	Tue, 16 September 2003 13:56
	Re: Help needed with designing...	ed_ma61	Tue, 16 September 2003 15:41
	Re: Help needed with designing...	ed_ma61	Tue, 16 September 2003 16:11
	Re: Help needed with designing...	ed_ma61	Mon, 10 May 2004 08:26
	Re: Help needed with designing...	takai	Mon, 10 May 2004 08:38
	Re: Help needed with designing...	ed_ma61	Mon, 10 May 2004 09:15
	Re: Help needed with designing...	YelloRolla	Mon, 10 May 2004 08:46

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