X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 1 [X] Return-Path: Received: from [68.202.132.19] (account marv@lancaironline.net) by logan.com (CommuniGate Pro WEBUSER 5.1.3) with HTTP id 1635738 for lml@lancaironline.net; Sun, 03 Dec 2006 15:31:25 -0500 From: "Marvin Kaye" Subject: Re: hp/gph constants To: lml X-Mailer: CommuniGate Pro WebUser v5.1.3 Date: Sun, 03 Dec 2006 15:31:25 -0500 Message-ID: In-Reply-To: <003501c71714$067a4690$0202a8c0@Notebook> References: <003501c71714$067a4690$0202a8c0@Notebook> X-Priority: 3 MIME-Version: 1.0 Content-Type: text/plain;charset="iso-8859-1";format="flowed" Content-Transfer-Encoding: 8bit Posted for "Jonathan Fuller" : """ "cblitzer" wrote: I always thought that LOP, if one multiplies the GPH by 14.7, that will get you almost right on to your percent horse power. ------------------------------------------------------------------------ ---------- I believe that the multiplier is 14.2 Robert M. Simon ES-P N301ES """ My understanding (the source is the operating instructions on the Tornado Alley Turbo turbonormalizer available for review on their website) is that the constant for the IO-550 (with 8.5:1 compression ratio) is 14.9 hp/gph. The TSIO-550 (with 7.5:1 compression ratio) is 13.7 hp/gph. This can be checked on your own engine by leaning to peak at the engine's max rpm and mp and dividing the rated power by the fuel flow. If you accept the constants, you'll observe that your engine will make a little better than rated power when the air is cold and a little less when hot. These constants depend most on compression ratios, but there is a little minor variation among different engine types. Secondary effects probably include factors like camshaft profile and induction and exhaust characteristics. Jonathan Fuller