Mustang Exhaust
- Kit
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| 9/21/2008
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Posts: 877
Joined: 1/20/2002 From: Norristown,
PA, USA Status: offline
Hi Bill,
I know there is nothing wrong with the sensor set-up Bill. I just find it a "beautiful thing" not have to mount the sensors and worry about the possibility of them comming loose. I know they won't, but to me... there's one less "weak link". I'm still a few months away from flying so waiting a bit isn't going to hurt me, I have soooooo much to do on this bird yet. Here's a pic of my motor and pickups. What do ya think about the wires?
-Dave (Mustang51)
< Message edited by Mustang51 -- 1/20/2008 6:35:10 PM >
Posts: 877
Joined: 1/20/2002 From: Norristown,
PA, USA Status: offline
quote:
ORIGINAL: yl5295
Mustang51,
Do you know what the output of the third wire looks like? If it is the same as the ZDZ then I have some prototypes that should work. If it is like the Zenoah then it will be a month or two before I have something that will work. There is nothing wrong with using the sensor and they are the cheapest way to go.
You asked me... Output of third wire looks like? This is my wire. Am I making sense?
-Dave
< Message edited by Mustang51 -- 1/20/2008 6:45:24 PM >
Not the hall senor wire. What does the electrical signal look like on the third wire between the ignition and ignition battery?
Some ignitions have a third wire going to the ignition battery that it outputs a TTL level signal (0-5V) out on that it pulses every spark. If 3W has the third wire is it 5V when on and 0V pulse when it sparks or 0V when on and 5V when it sparks.
Posts: 877
Joined: 1/20/2002 From: Norristown,
PA, USA Status: offline
Heres the 3W instructions. Wire are described at bottom.
...Cable information . blue wire to sensor red / black with bigger dia, with socket to battery red / black with plug connection for red LED, long contact + yellow / white with socket connection for 3W tachometer and other options
What do you think about the yellow\white wire being used with the "Twin Sync"?
-Dave
< Message edited by Mustang51 -- 1/20/2008 7:45:13 PM >
Posts: 877
Joined: 1/20/2002 From: Norristown,
PA, USA Status: offline
It looks like it is about .80v when on. 0 when spark fires. A note... After the spark plug fires, the meter reads 0 for a few seconds, then about .59, then about .70, then .80. As though a capacity was being built up. Is this reading off of the capacity being built up in the ignition module possibl? -Dave
I don't think that is what is happening. I am willing to bet that it is an open-collector or open-drain output. What that means is that it connects it to ground when it sparks through a transistor. Otherwise it is "floating" ie the transistor is turned off. This is the same as the hall effect sensors that the Twin sync uses. A quick and easy way to check it to plug the white and yellow wire into the black/brown and orange sensor connector on the twinsync. Try it and see if the green led functions correctly.
Although I suspect that you might likely be able to connect the white and yellow wire directly into the twinsync and it will work fine, I don't recomend it. The reason is there is probably spark noise in the ignition ground that you don't want getting into the receiver ground. You could determine this with range tests with the engines running - but in general not a good practice. The right way to do this is with an optocoupler.
If it is as I suspect then the optical couplers I built for the ZDZs will not work on 3Ws. You will have to wait on month or so until I have the new ones.
Posts: 877
Joined: 1/20/2002 From: Norristown,
PA, USA Status: offline
Thanks Bill. I'll wait until I am absolutely ready to go. I figure first runs will be late spring. Mean time I'll keep an eye on the thread. I appreciate your time.
Posts: 260
Joined: 12/1/2003 From: Tallmadge,
OH, USA Status: offline
So this sensor could hook directly to a magneto engine and be opti isolated?
I have 2 new stock G-38's with magnetos, and wanted to use the fema on board starters that hook up to the crank @ the rear. No room for the recomended sensor install at the rear, cant get the standard hall effect sensors anywhere near the magneto up front for a spinner setup. Cant put up front, cant put in back, dont want to spend $400 to swap out to electronic ignition on 2 new engines.
Could you make a opti iso pulse sensor that piggybacks on the plug wire for me?
Posts: 260
Joined: 12/1/2003 From: Tallmadge,
OH, USA Status: offline
I think that ring gear is after the one way bearing, i.e. its dosent spin with the crank, it only spins when the starter is engaged. The free-wheel one way bearing sits right on the rear crank output shaft. From what I can tell from the parts views from FEMA.
Posts: 877
Joined: 1/20/2002 From: Norristown,
PA, USA Status: offline
Bill and everyone with ideas,
The sensor is a very small seamingly fragile piece. Does anyone (BILL) have any suggestions (pics would be great) of just how to mount the sensor to the motor?
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