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Old 03-19-2008, 12:31 AM   #1
lilbill
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Default morris single fire module ?

what makes these plug wires worth $152 ?? anybody ever take one of these apart ? i believe all they are is a pair of wires with one or two diodes soldered in there.
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Old 03-19-2008, 12:37 AM   #2
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Default Re: morris single fire module ?

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Originally Posted by lilbill View Post
what makes these plug wires worth $152 ?? anybody ever take one of these apart ? i believe all they are is a pair of wires with one or two diodes soldered in there.
Becouse it says Morris on it.
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Old 03-19-2008, 04:25 AM   #3
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Default Re: morris single fire module ?

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Originally Posted by lilbill View Post
what makes these plug wires worth $152 ?? anybody ever take one of these apart ? i believe all they are is a pair of wires with one or two diodes soldered in there.

I can probably reverse engineer it, what exactly do these wires do. Do they give a single fire spark from an otherwise dual spark mag?
If so, how do you dictate which of the cylinders is going to get the spark first...second.
Or do these just allow you to use a single mag for dual plug application? Meaning they split each wire into 2 allowing for dual plug/per head use.
I was looking at these a while back and any clarification appreciated?

Joe
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Old 03-19-2008, 08:53 AM   #4
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Default Re: morris single fire module ?

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Originally Posted by lilbill View Post
what makes these plug wires worth $152 ?? anybody ever take one of these apart ? i believe all they are is a pair of wires with one or two diodes soldered in there.
What is in there i can't say, but it somehow alternates the spark from one wire to the next. look like they are made and slid into the cylinder on the wire and then filled w/ gel (or some substance) to keep them safe and dry, or at least so no one can see what's in there.

jbco2, i could see using them in the following ways (if it's of any help):
  • dual plugs, dual magnetos- each magneto as a single fire mag, running two plugs each
  • dual plugs, single mag-running all four plugs off of one magneto
  • single plugs, single mag-standard single fire arrangement
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Old 03-19-2008, 09:01 AM   #5
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Default Re: morris single fire module ?

you can use a single msf to single fire a single set of plugs, or a pair of them for dual plugged heads.

when you use a single, there is a special plug wire for the second hole that gets grounded to the magneto body.

it senses the polarity of the spark, and uses that to determine which plug to fire. you hook it up one way, then if it doesn't work you try it the other way.

dual msf's work the same way, except opposite msf leads will fire together, since they are working off opposite polarity. you get it running on a single msf, then hook up the second with the wires opposite the first one.
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Old 03-19-2008, 11:38 AM   #6
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Default Re: morris single fire module ?

yeah, they have a diode in them (maybe 2 ?) and work on the pricipal that a mag reverses the polarity of the high tension spark with each revolution. on a stock mag like a hunt the plugwire towers are connected together in the coil to fire as one, just like a regular dual fire points coil.
but a mag has two permanent magnets on the rotor spaced a little less than 180 apart. i guess the polarity of the magnets are reversed because when magnet "A" passes the induction coil it creates a current in one direction and when magnet "B" passes the coil it creates a current with opposite polarity.
so in operation, magnet "A" fires for the front cylinder and magnet "B" fires for the rear cylinder. however in stock dual fire configuration both plugs fire at the same time with one plug firing on the exhaust stroke of one cylinder every time.
what the msf wires do is sense the polarity of the high tension spark at the mag coil and only allows passage of one polarity at a time so that when say magnet "A" makes it's pass at tdc #1 only that polarity spark is allowed to reach the plugs of #1 cylinder. then when magnet "B" makes it's pass only it's polarity spark is allowed to reach the plugs of #2 cylinder.
anyway, that's my understanding of the theory behind them but somebody with a better background in electrical engineering might be able to break it down or explain it better.
if indeed all they are is a couple diodes and some solid core plug wire then they should be able to be made at home pretty cheaply.
any engineers out there ???
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Old 03-19-2008, 01:11 PM   #7
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Default Re: morris single fire module ?

In the morning I will ask one of the electrical engineers working with us.
Maybe he can she some light.

Joe
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Old 07-16-2014, 10:17 PM   #8
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Default Re: morris single fire module ?

Yes I know this is an old thread. I thought it better to bring it back up than clutter the board with more threads of things already asked.

Did anybody ever end up figuring this out?

And besides that, anybody have this module that can say how well it works?
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Old 07-17-2014, 11:01 PM   #9
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Default Re: morris single fire module ?

It uses 2 diodes.....
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Old 07-18-2014, 12:34 AM   #10
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Default Re: morris single fire module ?

Whoops I wrote the last part in confusing language. I meant to ask if it's a worthwhile upgrade. Does it make a good positive change?
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Old 07-18-2014, 12:39 AM   #11
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Default Re: morris single fire module ?

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Originally Posted by Robicycle View Post
It uses 2 diodes.....
yeah, we know but what value diode ?
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Old 07-18-2014, 12:42 AM   #12
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Default Re: morris single fire module ?

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Originally Posted by LivingCanvas View Post
Whoops I wrote the last part in confusing language. I meant to ask if it's a worthwhile upgrade. Does it make a good positive change?
single fire ignition is a good upgrade for a points or electronic ignition because it lets you time both cylinders individually for a better burn. i'm not sure how much timing control you would get with a mag.
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Old 07-18-2014, 09:27 AM   #13
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Default Re: morris single fire module ?

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Originally Posted by LivingCanvas View Post
Yes I know this is an old thread. I thought it better to bring it back up than clutter the board with more threads of things already asked.

Did anybody ever end up figuring this out?

And besides that, anybody have this module that can say how well it works?
I use 2 Morris MSFs on my dual plugged STD Panhead motor with Morris M74 mag. Been running them for about 2 years. Definitely hotter spark and my idle is markedly different without them.

However, ensure that the diodes are riding in the wind and staying relatively cool. Try to isolate them from the motor as best you can. Ive found if its a really hot day (temps approaching 100deg) and motor temps are high, Ive had hot start troubles.

Some call these snake oil or voodoo, but I cant say I agree...yet.

And yes, they are $$$$.
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Old 07-18-2014, 10:16 AM   #14
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Default Re: morris single fire module ?

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Originally Posted by buckman50 View Post
I use 2 Morris MSFs on my dual plugged STD Panhead motor with Morris M74 mag. Been running them for about 2 years. Definitely hotter spark and my idle is markedly different without them.

However, ensure that the diodes are riding in the wind and staying relatively cool. Try to isolate them from the motor as best you can. Ive found if its a really hot day (temps approaching 100deg) and motor temps are high, Ive had hot start troubles.

Some call these snake oil or voodoo, but I cant say I agree...yet.

And yes, they are $$$$.
Good to hear from some one who actually runs these. I was thinking of running one not two but good to hear none the less.

Been searching the subject a lot and also came by this thread on the xlforum.
http://xlforum.net/vbportal/forums/s....php?t=1434012

There's some decent info in there as always. The Ironhead section of the xlforum has some good tech. There's a bit of back and forth on the benefit of running two for dual plugging...
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Old 07-18-2014, 10:59 AM   #15
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Default Re: morris single fire module ?

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Originally Posted by LivingCanvas View Post
Good to hear from some one who actually runs these. I was thinking of running one not two but good to hear none the less.

Been searching the subject a lot and also came by this thread on the xlforum.
http://xlforum.net/vbportal/forums/s....php?t=1434012

There's some decent info in there as always. The Ironhead section of the xlforum has some good tech. There's a bit of back and forth on the benefit of running two for dual plugging...
Thanks for that link. As Im no motor or mag expert, nor do I race this thing or care about any "cool guy" factor. Since I had dual plugged heads, I wanted to take advantage of all of what I read about dual plugging and single fire. This post I agree with and have seen proven effects as a result of the dual plug/single fire setup:


"dual plugs are a very cheap way of getting more power and better fuel consumption...twin plugging ignites more of the mixture and has a more complete burn, result more power and better fuel econcomy...have dual plugged a panhead and a shovelhead, both with excellent results"

If my piston domes are any indication, they're clean...absolutely no carbon buildup. As for fuel economy, I have peanut tank that Im lucky to get a gallon into. My range, I think, is 38-42miles, If Im lucky. Cant say that dual plugging/single fire has effectively given me better gas mileage though. Without a speedo, wouldn't know exactly anyway....
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Old 07-18-2014, 12:55 PM   #16
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Default Re: morris single fire module ?

High voltage diodes are very expensive.
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Old 07-18-2014, 12:56 PM   #17
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Default Re: morris single fire module ?

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Originally Posted by sandergecko View Post
High voltage diodes are very expensive.
Exactly! Particularly those designed to hold up under these kind of operating conditions....

I've bought into the single fire idea, and have a Morris G5 and two sets of the diode wires on order for my dual plug heads on my '59 pan. As it's a 93" kick start setup (at least at the present), I wanted every advantage I could get for starting and tuning this bike.

Yes it's pricey, but Morris Mag went through the "test and tune" stage to get the right setup that would work, getting the right diodes, not something I want to go through myself, nor do I want to steal somebody else's work and try to make a cheap copy to save a couple bucks. And the new mag has features that neither my old Joe Hunt mags have that I really like. Should be a good setup when all is said and done....
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Old 07-18-2014, 03:37 PM   #18
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Default Re: morris single fire module ?

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Originally Posted by 2Loose View Post
Yes it's pricey, but Morris Mag went through the "test and tune" stage to get the right setup that would work, getting the right diodes, not something I want to go through myself, nor do I want to steal somebody else's work and try to make a cheap copy to save a couple bucks. Willy
+1. Well put.
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Old 09-17-2014, 01:53 PM   #19
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Default Re: morris single fire module ?

I think 1 of my MSF Cables is going on the blink.
I have been running a dual pair of the MSF's on my dual
plugged 93" pan for a few years now with great results, but
now I am losing spark on one of them.

I have no idea how to test these with a meter, Maybe I will
test both cables & compare the results.
If It is bad, I may gut it open & get the values of the Diodes &
post them to this thread. & maybe make my own cable, unless
they have a warranty which I highly doubt.
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Old 09-17-2014, 02:01 PM   #20
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Default Re: morris single fire module ?

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Originally Posted by lairdog View Post
I think 1 of my MSF Cables is going on the blink.
I have been running a dual pair of the MSF's on my dual
plugged 93" pan for a few years now with great results, but
now I am losing spark on one of them.

I have no idea how to test these with a meter, Maybe I will
test both cables & compare the results.
If It is bad, I may gut it open & get the values of the Diodes &
post them to this thread. & maybe make my own cable, unless
they have a warranty which I highly doubt.
you can check them with an ohm meter . if good they will only pass current in one direction. if they're bad they will either pass in both directions or not at all.
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