Return-Path: Received: from [65.33.166.31] (account marv@lancaironline.net) by logan.com (CommuniGate Pro WebUser 4.2b1) with HTTP id 3149644 for lml@lancaironline.net; Tue, 06 Apr 2004 20:24:44 -0400 From: "Marvin Kaye" Subject: Re: [LML] Alt air Induction system To: lml X-Mailer: CommuniGate Pro WebUser Interface v.4.2b1 Date: Tue, 06 Apr 2004 20:24:44 -0400 Message-ID: In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1"; format="flowed" Content-Transfer-Encoding: 8bit Posted for "George Braly" : Larry, Something is "wrong". Unexpectedly HOT induction air should not make the CHTS get hot enough to require a power reduction when one is in icing conditions. If you are ROP, hot induction air must makes the mixture RICHER and the CHTS would normally get cooler. If you are LOP, then hot induction air would make the mixture get richer and, conceivably make the CHTS get warmer, but going to full rich climb power would solve that problem. Regards, George > > > Question... Scott, have you looked at the "automatic" alternate air system specified in the IV construction manual and found it deficient? Answer... YES, it's deficient. The alternate air door does open if operating correctly; however the hot cowl air causes hot CHT's even at full rich in most installations. So unless you want to toast your engine you have to pull back on the power, not what you want when you're taking on ice in the soup. I've been there many times. Larry Klaas < < <