Return-Path: Received: from [65.33.160.45] (account ) by logan.com (CommuniGate Pro WebUser 4.1b6) with HTTP id 2358998 for flyrotary@lancaironline.net; Thu, 22 May 2003 09:54:10 -0400 From: "Marvin Kaye" Subject: Re: [FlyRotary] Tuned induction To: flyrotary X-Mailer: CommuniGate Pro WebUser Interface v.4.1b6 Date: Thu, 22 May 2003 09:54:10 -0400 Message-ID: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1"; format="flowed" Content-Transfer-Encoding: 8bit Posted for "Marko Bewersdorff" : talking music instruments: a trumpet has a lot of 180 degree turns in the resonace 'tube' but a fine measuring instrument such as the ear seems not to hear bad distortions. An organ pipe looks more majestic straight than looking like a tuba, plus building it straight is easier. The key is to have a large(ish) radius in the tube if it needs a bend. Resonances are a problem when you go to a suden change in diameter like opening up the diameter to the resonance chamber, a sharp right angle turn, or alike. Try to build no cheating radius into the manifold like if you want a narrow wrap over intake, don't cut the 180 degree bend short at the bottom to bring it closer to the engine. Might be old news, but that's all I gathered so far. Marko >>>I question it based of theory; not on fact. There is a reason why pipe organ pipes are straight, and why Mazda used straight-in tubes on their 4-rotor that won at Lemans.<<<