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#21
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Tach Attack
Peter Dohm wrote:
I admit that I don't recall who manufactures and sells them; but I seem to recall that Steve Wittman used a "self sufficient distributor" fitting that description, as part of his V8 conversion for the Tailwind, at least 25 years ago. Peter Would that really be a Vertex magneto that fits into the distributor hole? They use Vertex mags on VW engines sometimes... Scott |
#22
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Tach Attack
"Scott" wrote in message
.. . Peter Dohm wrote: I admit that I don't recall who manufactures and sells them; but I seem to recall that Steve Wittman used a "self sufficient distributor" fitting that description, as part of his V8 conversion for the Tailwind, at least 25 years ago. Peter Would that really be a Vertex magneto that fits into the distributor hole? They use Vertex mags on VW engines sometimes... Scott You are probably correct, although I no longer recall the name and do not recall where my copy of the V8 conversion plans might be stored. That was just one of several projects that never came to fruition. And today there are additional choices in the same range of power, weight, and displacement--that would not require the resurection of a 45 year old engine. Peter |
#23
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Tach Attack
Peter Dohm wrote:
"brian whatcott" wrote in message ... Philippe wrote: ... I also use the magnets for CDI electronic ignition. no more magnetos, no more cable for tach, no more copper tube for oil pressure... By Not sure if this is what you mean, but a few high energy magnets spinning on a plate do a great job producing pulses in a few coils spaced close to the spinning magnets. Seems like you could easily arrange two sets of coils to provide a double source for a CD ignition, as well as timing it.... Or perhaps more compact, a source (if rectified and smoothed) for one of those electronic ignition modules that fit inside the car distributor, these days.... Either way that really amounts to a magneto I suppose - but so few components, and double redundant so no battery would be involved..... Brian W I admit that I don't recall who manufactures and sells them; but I seem to recall that Steve Wittman used a "self sufficient distributor" fitting that description, as part of his V8 conversion for the Tailwind, at least 25 years ago. Peter Something that fits in the distributor hole and looks like a distributor, with no battery lead however, is the VW type magneto. Kinda expensive, and sticks up on a VW cowl, but does the job. Kinda like the Wittman approach?? Brian W |
#24
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Tach Attack
"Dan" wrote in message ... Stealth Pilot wrote: On Sun, 09 Aug 2009 21:11:48 -0700, John Kimmel wrote: Ron Wanttaja wrote: Not a real drawback, as the tach also includes a secondary counter that can still be used to keep track of minutes. However, 200 hours is about five years of flying for me, and the built-in battery of the Tiny Tach is only good for 5-8 years. At that point, I'd better hope the company is still operating...or come up with some other solution. Ron Wanttaja Here is a picture of the insides of a tiny tach. The gray stuff is soft potting compound similar to BMS5-95. The battery was a common 3v Lithim Ion button cell welded to the tabs before potting. If I ever find another tiny tach that needs a new battery, I will cut a hole right over the battery with a rotabroach or a mill instead of splitting the case. You can't open the case without breaking it http://tinyurl.com/tinytach John this is incredibly funny. they go to all the trouble of sealing up the case and filling it to make it bullet proof and what is it that the second reader of ron's post does? pull one apart to see what's inside :-) :-) :-) I love it! Stealth Pilot I think most of us have done that at one time or another. The hard part is putting it back together with no parts left over. Dan, U.S. Air Force, retired And making sure that the magic smoke doesn't EVER escape. Flash |
#25
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Tach Attack
Stealth Pilot wrote:
On Sun, 09 Aug 2009 21:11:48 -0700, John Kimmel wrote: Ron Wanttaja wrote: Not a real drawback, as the tach also includes a secondary counter that can still be used to keep track of minutes. However, 200 hours is about five years of flying for me, and the built-in battery of the Tiny Tach is only good for 5-8 years. At that point, I'd better hope the company is still operating...or come up with some other solution. Ron Wanttaja Here is a picture of the insides of a tiny tach. The gray stuff is soft potting compound similar to BMS5-95. The battery was a common 3v Lithim Ion button cell welded to the tabs before potting. If I ever find another tiny tach that needs a new battery, I will cut a hole right over the battery with a rotabroach or a mill instead of splitting the case. You can't open the case without breaking it http://tinyurl.com/tinytach John this is incredibly funny. they go to all the trouble of sealing up the case and filling it to make it bullet proof and what is it that the second reader of ron's post does? pull one apart to see what's inside :-) :-) :-) I love it! Stealth Pilot I pulled it apart years ago. -- John Kimmel So in this world Of the simple and odd, The bent and plain, The unbalanced bod, The imperfect people And differently pawed, Some live without love... That's how they're flawed. |
#26
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electronics [ Tach Attack]
brian whatcott a écrit:
I also use the magnets for CDI electronic ignition. no more magnetos, no more cable for tach, no more copper tube for oil pressure... By Not sure if this is what you mean, but a few high energy magnets spinning on a plate do a great job producing pulses in a few coils spaced close to the spinning magnets. I have two simple magnets one north face and the other south face glue at 0° and 180°. The sensor is one AH287 and I use two automotive CDI boxes as power stage for ignition #2. I use one distributorless box from M&W ignition for #1. For the electric wiring, I copy the following schematic: http://www.jodel.com/index.asp?p=potezwiring&engines My electronics devices are in the the point and distributor ignition place. In fact, I built 2 distributorless ignittions like today cars but still have fix timing. The wish list is one microcontroler for variable timing. No way to built a small generator with my magnets. A batteryless ignition like Jabiru require more start energy than my ignition. By -- « Si tous les poètes voulaient se donner la main, ils toucheraient enfin des doigts d'auteur! » Philippe Vessaire Ò¿Ó¬ |
#27
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electronics [ Tach Attack]
On Tue, 11 Aug 2009 09:26:15 +0200, Philippe
wrote: brian whatcott a écrit: I also use the magnets for CDI electronic ignition. no more magnetos, no more cable for tach, no more copper tube for oil pressure... By Not sure if this is what you mean, but a few high energy magnets spinning on a plate do a great job producing pulses in a few coils spaced close to the spinning magnets. I have two simple magnets one north face and the other south face glue at 0° and 180°. The sensor is one AH287 and I use two automotive CDI boxes as power stage for ignition #2. I use one distributorless box from M&W ignition for #1. For the electric wiring, I copy the following schematic: http://www.jodel.com/index.asp?p=potezwiring&engines My electronics devices are in the the point and distributor ignition place. In fact, I built 2 distributorless ignittions like today cars but still have fix timing. The wish list is one microcontroler for variable timing. No way to built a small generator with my magnets. A batteryless ignition like Jabiru require more start energy than my ignition. the trick with the magnets is to understand that it is the collapsing magnetic field that produces the pulse to the spark plug. if you look at a jabiru magnet there are 3 poles. as the magnet goes whizzing past the coil the coil sees North-South then suddenly South-North. the second magnet orientation is designed to accelerate the collapse of the field through the coil core. The two outer poles are , say, South and the centre one, say, North or vice versa. it is not just magnets on a plate but magnetic pole orientation as well that makes it work. Stealth Pilot |
#28
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Tach Attack
"brian whatcott" wrote in message ... Peter Dohm wrote: "brian whatcott" wrote in message ... Philippe wrote: ... I also use the magnets for CDI electronic ignition. no more magnetos, no more cable for tach, no more copper tube for oil pressure... By Not sure if this is what you mean, but a few high energy magnets spinning on a plate do a great job producing pulses in a few coils spaced close to the spinning magnets. Seems like you could easily arrange two sets of coils to provide a double source for a CD ignition, as well as timing it.... Or perhaps more compact, a source (if rectified and smoothed) for one of those electronic ignition modules that fit inside the car distributor, these days.... Either way that really amounts to a magneto I suppose - but so few components, and double redundant so no battery would be involved..... Brian W I admit that I don't recall who manufactures and sells them; but I seem to recall that Steve Wittman used a "self sufficient distributor" fitting that description, as part of his V8 conversion for the Tailwind, at least 25 years ago. Peter Something that fits in the distributor hole and looks like a distributor, with no battery lead however, is the VW type magneto. Kinda expensive, and sticks up on a VW cowl, but does the job. Kinda like the Wittman approach?? Brian W I believe so. Peter |
#29
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Tach Attack
"Scott" wrote Would that really be a Vertex magneto that fits into the distributor hole? They use Vertex mags on VW engines sometimes... I think it was this beast that I read some very unflattering things about, concerning reliability, about a month ago. It made me wonder if I would want to depend on one of these while above the NC mountains. Anyone else remember anything like that? -- Jim in NC |
#30
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Tach Attack
Morgans wrote:
"Scott" wrote Would that really be a Vertex magneto that fits into the distributor hole? They use Vertex mags on VW engines sometimes... I think it was this beast that I read some very unflattering things about, concerning reliability, about a month ago. It made me wonder if I would want to depend on one of these while above the NC mountains. Anyone else remember anything like that? Especially considering there is only one of them... |
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