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  #21  
Old 02-27-2013, 08:54 PM
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Russ McCutcheon Russ McCutcheon is offline
 
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Originally Posted by erikpmort View Post
Good point. Can I add an impulse coupler or whatever you call it to my existing R mag ?
I cant say for sure but I don't think you can, I think you would need a new impulse mag and the gear and the spacer, I think they sell them in a kit. If I had to do that I would just get EI on the non impulse side.
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  #22  
Old 02-27-2013, 11:00 PM
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Originally Posted by Russ McCutcheon View Post
I cant say for sure but I don't think you can, I think you would need a new impulse mag and the gear and the spacer, I think they sell them in a kit. If I had to do that I would just get EI on the non impulse side.
And maybe the hardest part would be replacing the studs in the case to fit the impulse mag.....
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  #23  
Old 03-02-2013, 10:47 AM
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I have a question. If I replace the right non impulse mag with a e-mag model P, what is the relationship between the electronic ignition and my existing mag ? Do I only get 50% of the EI benefits because I don't have both sides ?

So I'm stuck on a broken plane to go get my broken plane today. (Skywest) fun stuff !!
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  #24  
Old 03-02-2013, 11:21 AM
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I think you get 80% of the benefit with one EI.
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  #25  
Old 03-02-2013, 12:56 PM
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Quote:
Originally Posted by erikpmort View Post
I have a question. If I replace the right non impulse mag with a e-mag model P, what is the relationship between the electronic ignition and my existing mag ? Do I only get 50% of the EI benefits because I don't have both sides ?

So I'm stuck on a broken plane to go get my broken plane today. (Skywest) fun stuff !!
I'm not a P-mag expert, but basically what you'll have are two ignition sources that will fire at TDC for start, both will fire at 25° BTDC at takeoff, and the P-mag will advance the timing up to some maximum (on mine it's 42° BTDC) depending on manifold pressure and RPM. So at high altitude you'll get a more efficient and more complete burn. The mag, of course will still be firing at 25° BTDC, but it adds something to the burn such that if you turned it off at high altitude you would probably notice it. I think you would get most of the benefit of having two E.I.'s, I've heard 90%, but 80% sounds reasonable too. Also, with the P-mag, it should be a fairly easy install since you won't have to change studs; you might want to convert to auto plugs for the P-mag, which will require the inserts for the plug holes. But that is strictly your choice, aviation plugs will work too, but you'll have to re-gap them.
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Last edited by Pat Hatch : 03-02-2013 at 01:06 PM. Reason: Typos.
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  #26  
Old 03-02-2013, 07:14 PM
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I have an O-320, first I had two mags, then one each, then two P-Mags. With one each, I got all (as far as I can tell) of the benefits of quick starting, better idle, and saved 1 gph in fuel burn. With two P-Mags, I get perhaps a little better idle (I idle at 400 rpm and it is very smooth) and I gained 4 mph top speed, and a little higher cruise at any setting. I gained very little in fuel burn with the second P-Mag, maybe .2 gph. The first one is the biggest deal, performance wise. YMMV.

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  #27  
Old 03-02-2013, 09:26 PM
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Perfect thanks ! Got my plane home today, and even had nice tailwinds. 175 kts most of the way woo hoo. Looking forward to the upgrade. Gotta pay my darn sales tax first
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  #28  
Old 03-03-2013, 04:14 PM
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What could my right side non impulse slick mag sell for ?
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  #29  
Old 03-03-2013, 04:40 PM
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Quote:
Originally Posted by erikpmort View Post
What could my right side non impulse slick mag sell for ?
How much time on it? Model number? I would look up the new price and figure about 50% for a quick sale, depending on time, of course. I think the current model number would be 4370 for the non-impulse, seems like you might have an earlier model #.

Keep in mind that these are 500 hour mags and used to be called "throwaway mags." However, they can be overhauled for a couple hundred bucks.
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Last edited by Pat Hatch : 03-03-2013 at 04:52 PM. Reason: Added last sentence.
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  #30  
Old 03-03-2013, 05:09 PM
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Quote:
Originally Posted by Pat Hatch View Post

Keep in mind that these are 500 hour mags and used to be called "throwaway mags." However, they can be overhauled for a couple hundred bucks.
People keep saying this and it’s not accurate, these require a 500 hour inspection, they do not need to be replaced or O/H at 500 hours, I have one with about 700 hours, I replaced the points for $50 last year, otherwise it was and is in good condition and running well.

Still 50% price of new at most.
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