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02-27-2013, 08:54 PM
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Join Date: Oct 2005
Location: Vancouver, WA USA
Posts: 908
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Quote:
Originally Posted by erikpmort
Good point. Can I add an impulse coupler or whatever you call it to my existing R mag ?
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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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02-27-2013, 11:00 PM
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Join Date: Mar 2007
Location: Sonoma County
Posts: 3,821
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Quote:
Originally Posted by Russ McCutcheon
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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And maybe the hardest part would be replacing the studs in the case to fit the impulse mag.....
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VAF #897 Warren Moretti
2019 =VAF= Dues PAID
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03-02-2013, 10:47 AM
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Join Date: Oct 2012
Location: logan, utah
Posts: 405
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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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Erik Mortenson
Rans S-20 low and slow
14 build working on wings
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03-02-2013, 11:21 AM
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Join Date: Sep 2006
Location: Townsend, Montana
Posts: 3,179
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I think you get 80% of the benefit with one EI.
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Retired Dam guy. Life is good.
Brian, N155BKsold but bought back.
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03-02-2013, 12:56 PM
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Join Date: Jun 2006
Location: Vero Beach, FL
Posts: 881
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Quote:
Originally Posted by erikpmort
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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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.
Last edited by Pat Hatch : 03-02-2013 at 01:06 PM.
Reason: Typos.
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03-02-2013, 07:14 PM
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Join Date: Jan 2005
Location: Near Scipio, in Southern Indiana
Posts: 1,779
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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.
Bob
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Bob Kelly, Scipio, Indiana
Tech Counselor
Founder, Eagle's Nest Projects
President, AviationNation, Inc
RV-9A N908BL, Flying
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03-02-2013, 09:26 PM
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Join Date: Oct 2012
Location: logan, utah
Posts: 405
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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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Erik Mortenson
Rans S-20 low and slow
14 build working on wings
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03-03-2013, 04:14 PM
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Join Date: Oct 2012
Location: logan, utah
Posts: 405
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What could my right side non impulse slick mag sell for ?
__________________
Erik Mortenson
Rans S-20 low and slow
14 build working on wings
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03-03-2013, 04:40 PM
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Join Date: Jun 2006
Location: Vero Beach, FL
Posts: 881
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Quote:
Originally Posted by erikpmort
What could my right side non impulse slick mag sell for ?
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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.
Last edited by Pat Hatch : 03-03-2013 at 04:52 PM.
Reason: Added last sentence.
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03-03-2013, 05:09 PM
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Join Date: Oct 2005
Location: Vancouver, WA USA
Posts: 908
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Quote:
Originally Posted by Pat Hatch
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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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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