C'mon Virg. Lighten up!
If a person puts a stock distributor on an engine......... it's got all the "advance" provisions that it was designed with available. Only magnetos, which have no advance mechanism built into them, fall into the fixed timing trap. My engine (a Cont 0-200 derivative) will have one mag (fixed timing) and one electronic ignition system which has full advance capabilities built into it. It is a system similar to Claus Savors (sp) but built by an outfit in Chattanooga Tn. By the name of "Electro air". It sets itself to a retarded position near Top Dead Center for starting, then with increased RPM and higher altitude, slowly advances out to near 43 degrees. Most mags have an "advanced" position which is where they are static timed to..... and then use an impulse coupling to delay firing to aid the engine in starting by stopping the rotation of the mag until the crank nears Top Dead Center and then allows the mag rotor to release and "catch up". This gives the mag a hotter and retarded spark. Most planes produced in the last 3 or 4 decades have use a mag with an impulse. Certainly, the newer electronic units are a vast improvement over them. Especially the ones that can "advance' the timing. John Sickafoose Naples, fl A&P, IA -----Original Message----- From: VIRGIL N SALISBURY Sent: Monday, March 5, 2007 11:30 AM To: [email protected] Subject: Re: KR> VW conversion Aircraft have no advance provisions, Virg On Mon, 5 Mar 2007 10:43:16 +0200 "Eric Evezard" <[email protected]> writes: > Hi, > Can some netters kindly explain why VW manuals give 7 deg BTDC and > aero conversions give 25 to 28 deg BTDC as the timing.?. How does > one "tweak" the VW to use 25 to 28 deg BTDC.? > Best Regards, > Eric. > ZU-BMP > ZS-GML > _______________________________________ > Search the KRnet Archives at > http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to [email protected] > Post photos, introductions, and For Sale items to > http://www.kr2forum.com/phpBB2/index.php > please see other KRnet info at http://www.krnet.org/info.html > > _______________________________________ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to [email protected] Post photos, introductions, and For Sale items to http://www.kr2forum.com/phpBB2/index.php please see other KRnet info at http://www.krnet.org/info.html
