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The Aircraft Spruce Catalog in the ignition switch section shows how to connect certain kind of switches. Dick & Nancy [EMAIL PROTECTED] ----- Original Message ----- From: "Greg Bullough" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>; <[email protected]> Sent: Wednesday, September 17, 2003 8:10 AM Subject: Re: [COUPERS-TECH] Re: [COUPERS-TECH] > ----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]---- > > > Note also that there is wild debate on how ignition switches > should be wired. For example, on my switch, the contacts > are labeled 'Left' and 'Right' If you hook the right P-lead to > the one labeled Right and the left P-lead to the one labeled > Left things don't work like you think they do. > > When the switch is turned to the position on the plate > they included which says 'L', the left contact of the > switch is ON, the left P-Lead is grounded, therefore > you are running on the RIGHT mag! Vice-versa for > the left mag. > > Every second A&P I've asked about this gives the > opposite answer as to whether this is correct labeling > and nomenclature or not :-) > > I've concluded either everyone is confused or it > doesn't actually matter in practice, since when you're > turning the switch you aren't curled up in there with > the motor anyway. > > Greg > > > > At 11:03 AM 9/17/2003 -0400, [EMAIL PROTECTED] wrote: > >----[Please read http://ercoupers.com/disclaimer.htm before following any > >advice in this forum.]---- > > > > > >In a message dated 9/16/03 6:27:27 PM Eastern Daylight Time, [EMAIL PROTECTED] > >writes: > > > > > Is there anything you can think of that could cause the drop or any > >direction > > > you could give me in rechecking or troubleshooting? > > > > > >First of all, confirm the mags are installed correctly and timed correctly. > >The Left mag is supposed to fire the bottom plugs on all 4 cylinders. Many > >Lycoming type mechanics think it should fire top plugs on one side and > >bottom on > >the other. Not so, because the timing of the mags is staggered. Conversely, > >the right mag fires the top plugs. Next, the timing. The left mag should > >be set to 30* BTDC. The right mag is set to 28* BTDC. (The authoritative > >source of these values is the engine Type Certificate Data Sheet) > > > >If all this is correct and the right mag and harness and top plugs are all > >confirmed OK, then it pays to look at the left mag, as someone else > >suggested. > >One thing to try is switching mags. Make sure that the mag that's firing the > >bottom plugs is the one set to 30*, regardless of which side of the engine it > >happens to be on at the time, otherwise you'll just confuse the issue. (Be > >sure to put everything back the way it should be when you're done to prevent > >confusion in the future). > > > >The carb is not likely the cause of this problem, but if it is a C75 carb, > >you'll never make rated power. The throat of a C75 carb is smaller and > >cannot > >flow enough air to make 85 HP at rated RPM. > > > >RSVP > >John > >========================================================================= == === > >To leave this forum go to: http://ercoupers.com/lists.htm > >Search the archives on http://escribe.com/aviation/coupers-tech/ > > ========================================================================== == == > To leave this forum go to: http://ercoupers.com/lists.htm > Search the archives on http://escribe.com/aviation/coupers-tech/ > > > ========================================================================== ==== To leave this forum go to: http://ercoupers.com/lists.htm Search the archives on http://escribe.com/aviation/coupers-tech/
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