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07-04-2015, 06:33 PM | #1 |
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wico jem 1590 magneto by ford
need help finding parts break down - parts list - break down ... for a ford magneto (air plane & stationary) 1930's wico jem 1509. thanks .. steve
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V4f Last edited by V4F; 07-07-2015 at 09:01 AM. |
07-04-2015, 07:27 PM | #2 |
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Re: wico jem 1590 magneto by ford
Try one of the racing magneto service companies like
Tom Cirello Don Zig Joe Hunt. |
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07-04-2015, 07:49 PM | #3 |
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Re: wico jem 1590 magneto by ford
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07-04-2015, 08:33 PM | #4 |
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Re: wico jem 1590 magneto by ford
found a good place for parts , just need a diagram for reference
good link ... thanks
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07-05-2015, 05:46 AM | #5 |
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Re: wico jem 1590 magneto by ford
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07-05-2015, 12:02 PM | #6 |
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Re: wico jem 1590 magneto by ford
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Rudy Calin www.rebuiltmags.com 651-233-6655 **********
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V4f Last edited by V4F; 07-05-2015 at 02:32 PM. |
07-05-2015, 01:17 PM | #7 | |
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Re: wico jem 1590 magneto by ford
Quote:
These 'up top' mags that fit A/B Ford 4 cyl engines, have a tendency of work loose and they have more resistence/wear on cam gear due to impulse mech operation. I've had a few of that type mag. Have you considered the 'side drive' mag for such engine ? |
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07-05-2015, 01:49 PM | #8 |
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Re: wico jem 1590 magneto by ford
no I haven't , but I like the ford mag . ill try it for awhile & see . do you know of a parts catalogue for the jem 1590 ? thank you .. steve
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07-06-2015, 02:40 PM | #9 | |
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Re: wico jem 1590 magneto by ford
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I'm thinking that you have a Wico jem 1509, rather than a 1590, eh ? |
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07-06-2015, 04:45 PM | #10 | |
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Re: wico jem 1590 magneto by ford
Quote:
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07-06-2015, 06:30 PM | #11 |
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Re: wico jem 1590 magneto by ford
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07-07-2015, 09:02 AM | #12 |
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Re: wico jem 1590 magneto by ford
yes mine is a "1509" . I miss printed . found out they are very rare . not made since 1943 . a collectors item maybe ? LOL
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07-07-2015, 03:57 PM | #13 |
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Re: wico jem 1590 magneto by ford
I hope you get it like you want and run it ! I'd like to know what you think of the experience of using it for the street. Collector item, yeah, I had 'collected' several 1509s , before seeing that they went to another collector... I've been looking for one that has automatic advance from back in the day. Been told that there ain't such an animal, so FS dist is doing just great , eh
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07-08-2015, 08:46 AM | #14 |
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Re: wico jem 1590 magneto by ford
apparently the have a "lag angle" . at start they are retarded 9-12* . soon as it starts it is back to where you set it . mine has that . if I get it together & in I will let you know how I like it .......... steve
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01-14-2020, 10:18 AM | #15 |
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Re: wico jem 1590 magneto by ford
I just picked up a 1509 for my banger...anyone using one on their car?
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01-14-2020, 12:23 PM | #16 |
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Re: wico jem 1590 magneto by ford
Just a comment, I agree with hardtimes about it may not be a good idea to run a top-drive mag, especially while up in the air. If it slips or jumps time you could be stuck up there all day waiting for a tow! It would be especially likely to be a problem with the impulse still in the mag, it would put a lot of strain on that little drive gear. I run a side-driven mag in my Bonneville engine without an impulse, and it fires up with no problem.
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01-14-2020, 01:19 PM | #17 |
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Re: wico jem 1590 magneto by ford
Jim,
you may want to discuss removing the impulse mechanism and talk about starting the motor. John
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01-14-2020, 01:27 PM | #18 |
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Re: wico jem 1590 magneto by ford
Here is a freeby. https://oldcroak.com/jem-manual/
Parts are not easy to get for the older Wico Jems. Most of the Pietenpol aircraft that used the model A engine ran an crankshaft driven magneto that was more conventional is design. The Pietenpol kit for the engine used a special head for cooling so they moved the mag. An impulse coupling was built in to the Jem 1509 for starting. There is no other provision for a starting aid unless the mag body can be rotated and connected to the spark control in some way. Starting at full advance will eventually damage the starter due to kick back. |
01-15-2020, 01:07 PM | #19 |
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Re: wico jem 1590 magneto by ford
John, The mag must be partially disassembled to remove the impulse, it looks similar to advance weights. In our lakester we use a starter off a Toyota or something, but I also have run that engine on the street using a stock Model A starter running on 12v. In both cases the engine starts right up, no problems. I engage the starter and when the engine is spinning, I flip the ignition switch to 'on'. I'm running 35 degrees advance, it has never kicked back or failed to start. Simple, like me!
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01-15-2020, 04:07 PM | #20 |
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Re: wico jem 1590 magneto by ford
Yes, Thanks Jim,
The impulse mechanism I am told was to assist in starting airplanes. Not to retard the timing, but to give a quick snap of the mag to actually make spark. And for what its worth, not having to disassemble something to improve it seems like cheating. After all, having left over parts is the whole idea! John
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01-15-2020, 06:18 PM | #21 |
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Re: wico jem 1590 magneto by ford
The impulse coupling is there to delay the spark to a more retarded position so the starter won't get busted when it tries to kick back at full advance.
Mags are great for aircraft since they only run at a certain rpm most of the time. When there are large variations in rpm such as driving on the street, a mag is not as friendly to the overall function. Street cars need some spark control to prevent detonation and to increase fuel mileage. The aircraft engines can be leaned for altitude so having two magnetos is no big deal with them. They are set for full advance. Impulse couplings are not used much anymore due to their tendency to fail and cause problems. Most aircraft have one or two electronic starting aids that run through a set of retard points built into the magneto just for the start phase. The starting aids only work when the starter is actuated. This thread is a few years old & brought back up by a newby that doesn't want to post a new thread. |
01-15-2020, 06:46 PM | #22 |
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Re: wico jem 1590 magneto by ford
What is the purpose of the impulse coupling on a magneto?
A mechanical device, known as the impulse coupling or starter, is installed between the engine drive and the magneto proper on a majority of rotary magneto installations. Its primary function is to intensify the ignition spark at low rotative speeds in order to facilitate engine starting. Learned this from an old aircraft mechanic, as he said, hand propping ain't easy. J
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01-16-2020, 09:54 AM | #23 |
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Re: wico jem 1590 magneto by ford
It just delays it. It doesn't really make the spark any hotter than it normally is. The aircraft type mags that I'm more familiar with, do have a spring effect that flips the mag through E-gap to reverse the polarity quicker which give a tad bit more effective spark than just slowly turning it through e-gap would. Once the engine starts, the couplings flyweights deactivate the retard sequence and return the spark to full advance.
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