X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from EXHUB003-3.exch003intermedia.net ([207.5.74.110] verified) by logan.com (CommuniGate Pro SMTP 5.4c3j) with ESMTPS id 4988503 for flyrotary@lancaironline.net; Thu, 19 May 2011 08:54:47 -0400 Received-SPF: none receiver=logan.com; client-ip=207.5.74.110; envelope-from=jwhaley@datacast.com Received: from EXVMBX003-5.exch003intermedia.net ([207.5.74.45]) by EXHUB003-3.exch003intermedia.net ([207.5.74.110]) with mapi; Thu, 19 May 2011 05:54:10 -0700 From: Jeff Whaley To: "flyrotary@lancaironline.net" Date: Thu, 19 May 2011 05:55:23 -0700 Subject: RE: Engine Tuning Thread-Topic: Engine Tuning Thread-Index: AcwWC7h48sEAcJeqTbaZhuQJUhn7JAAFQCyg Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Hi Steve, I always find something interesting in your reports, in this one = I'm most interested in how you know what the Mode 3 and Mode 6 correction v= alues are. Are they displayed by an EM2/3 or do you have something custom o= f your own making? If you start with ALL DEFAULTS then adjust Injector Flow rate with Mode 3, = followed by Mode 6 and maybe Mode 2 your Mixture Correction Table would be = a flat line at either 0 if display is -128 to +128 or it would be 128 if di= splay is 0 to 256. Which in my opinion tells you nothing about fuel deliver= y - the only way to know what your fuel delivery is in this scenario would = be to display the injector pulse width from BIN 1-128 or read your fuel flo= w meter. Jeff From: "Steven W. Boese" Subject: RE: [FlyRotary] Re: Engine Tuning Date: Thu, 19 May 2011 00:58:26 -0600 To: Rotary motors in aircraft Brian and Ed, In order to compare the resulting mixture based on mixture correction table= values, the other EC2 parameters from mode 3, mode 6, and the mixture con= trol setting as well as the injector size and fuel pressure must be compara= ble. As both of you have indicated, the result of all of those variables a= s well as others can be seen in the O2 sensor reading. That reading is fas= t to respond and easy to interpret. With conditions of RPM up to 6800 and MAP of over 29 inches, it is possible= that the fuel requirement exceeds that of the 28 and 40 lb injectors. Thi= s is where knowing the EC2 parameters might be useful. I've attached a sna= pshot of data collected today from my EC2 with the following parameters: Mode 3: 175 (67-255 range) Mode 6: 127 (0-255 range) Mixture control: 256 (full rich -256 to 256 range) Mixture correction table: 127 (-127 to 127 range) MAP: 29.5 inches The green trace is the injector signal where the injector is delivering fue= l when the voltage is pulled low. The white trace is the CAS signal from w= hich the RPM can be determined. The data is from the instant that the tran= sition from pulsed to static injector operation is taking place. Under these conditions, the injectors go static (not pulsed but open full t= ime) at 4000 RPM. At RPM greater than 4000, the mixture will go lean since= the injectors are already delivering all the fuel they can. Keeping the parameters the same as above except for setting the mixture con= trol to zero (mid range), the injectors go static at 5600 RPM. The modes 3 and 6 parameters are just my guesses at what might be reasonabl= e for the injectors in use. If Brian can retrieve the actual Mode 3 and 6 = values from his EC2, I can test those parameters in my EC2 here and see if = his injectors are really be going static. It is not necessary to actually = have the injectors to do this. This would be useful information because if= the fuel flow is limited by the injectors, making changes to the mixture c= orrection table or the mixture control would be ineffective at resolving a = lean condition at high RPM. This may help in determining if mixture is the= problem or if it might be timing. Steve Boese RV6A 1986 13B NA RD1A EC2 __________ Information from ESET NOD32 Antivirus, version of virus signatur= e database 6134 (20110519) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com This message, and the documents attached hereto, is intended only for the a= ddressee and may contain privileged or confidential information. Any unauth= orized disclosure is strictly prohibited. If you have received this message= in error, please notify us immediately so that we may correct our internal= records. Please then delete the original message. Thank you.