Main Menu

Dual output coils for a single spark head

Started by Düb Lüv, April 13, 2011, 05:50:42 AM

Previous topic - Next topic
Print
Go Down Pages1 2
User actions

Düb Lüv

April 13, 2011, 05:50:42 AM
i saw an SS on ebay that had (2) dual outputs coils and had both wires going into a single spark plug per coil (non-DS bikes). i understand that producing a hotter spark would have a more efficient burn, but has anybody else know about using this set-up?
Building, building, building

Düb Lüv

#1
April 13, 2011, 05:51:58 AM
Building, building, building

Syscrush

#2
April 13, 2011, 11:33:39 AM
Quote from: Düb Lüv on April 13, 2011, 05:50:42 AM
i understand that producing a hotter spark would have a more efficient burn,
It may or may not - it's a kind of contentious issue.

ducatiz

#3
April 13, 2011, 12:02:07 PM Last Edit: April 14, 2011, 08:58:17 AM by ducatiz
That is a make the beast with two backsing sexy SS

A hotter spark may give you a tiny edge as it will ignite fuel slightly faster.  Compare tossing a match onto a pool of gasoline vs tossing a wood torch:  they both go to flame fast, but if you could see it, the torch would make it go a little faster, perhaps milliseconds.

A dual spark produces a larger flame front in the cylinder, a hotter spark using the same plug would burn the plug out faster.  Dual spark has a definite advantage.  Instead of a "hotter" spark, you have a "larger" spark and that allows for more fuel to be burnt. 

Personally, I don't see the advantage of a "single spark, dual coil" design.   It would be easy enough to implement on a race bike, and the fact that NO ONE uses it probably means there is no advantage.
Check out my oil filter forensics thread!                     Offended? Click here
"Yelling out of cars, turning your speakers out the window to blast your music onto the street, setting off M-80 firecrackers, firing automatic weapons into the airâ€"these are all well and good. But none of them create a merry atmosphere of insouciance and bonhomie quite like a revving motorcycle.

Raux

#4
April 14, 2011, 08:21:01 AM
the one in the ebay listing had been converted to dual spark. so it had its heads modified to take the second spark plug. Ducati-kaemna does that as well.

Düb Lüv

#5
April 14, 2011, 08:33:40 AM
Quote from: Raux on April 14, 2011, 08:21:01 AM
the one in the ebay listing had been converted to dual spark. so it had its heads modified to take the second spark plug. Ducati-kaemna does that as well.



did you ask him? cause there's no plug wires on the clutch side unless they're hidden and what looks like 2 plug wires going into the vertical spark lug boot.
Building, building, building

Raux

#6
April 14, 2011, 09:18:30 AM
well the listing says 'dual spark' so that's the only way to do it

this is from Kaeman.. probably why you can't see it

ducatiz

#7
April 14, 2011, 09:36:09 AM
In the third photo, you can see TWO wires going to the vertical head spark plug.
Check out my oil filter forensics thread!                     Offended? Click here
"Yelling out of cars, turning your speakers out the window to blast your music onto the street, setting off M-80 firecrackers, firing automatic weapons into the airâ€"these are all well and good. But none of them create a merry atmosphere of insouciance and bonhomie quite like a revving motorcycle.

Raux

#8
April 14, 2011, 09:48:39 AM
yeah saw that.
sending double the voltage to a single sparkplug hoping they hit at the same time?

ducatiz

#9
April 14, 2011, 10:36:23 AM
Most likely with a dual head coil it will spark at the same time.  I just question the efficacy of it.
Check out my oil filter forensics thread!                     Offended? Click here
"Yelling out of cars, turning your speakers out the window to blast your music onto the street, setting off M-80 firecrackers, firing automatic weapons into the airâ€"these are all well and good. But none of them create a merry atmosphere of insouciance and bonhomie quite like a revving motorcycle.

ducatiz

#10
April 14, 2011, 11:51:27 AM
I emailed the seller,  here's his reply:

QuoteEach head has 2 plugs, 4 wires. You have to remove the lower and Carbon belt cover to see the other two.

So it's just a dual spark setup and the spark wires have TWO leads from each coil terminal.
Check out my oil filter forensics thread!                     Offended? Click here
"Yelling out of cars, turning your speakers out the window to blast your music onto the street, setting off M-80 firecrackers, firing automatic weapons into the airâ€"these are all well and good. But none of them create a merry atmosphere of insouciance and bonhomie quite like a revving motorcycle.

Raux

#11
April 14, 2011, 01:09:43 PM
so it's just like the picture i put up from Kaemna.

each head has 4 wires? so he has 4 dual output coils?

ducatiz

#12
April 14, 2011, 01:53:38 PM
No just two coils.  Each coil terminal has 2 wires.
Check out my oil filter forensics thread!                     Offended? Click here
"Yelling out of cars, turning your speakers out the window to blast your music onto the street, setting off M-80 firecrackers, firing automatic weapons into the airâ€"these are all well and good. But none of them create a merry atmosphere of insouciance and bonhomie quite like a revving motorcycle.

Raux

#13
April 14, 2011, 02:25:47 PM
yeah i figured... just hate when people write vague sentences.

"Each head has 2 plugs, 4 wires."

koko64

#14
April 14, 2011, 03:55:54 PM
Gotta say, wish the factory did it that way instead of through the front of the timing belt cover, much tidier.

If I ever do this mod on my 900, I now know a cleaner way.

Nice SS.
2015 Scrambler 800
Print
Go Up Pages1 2
User actions