That was an interesting read, thanks for that response. Definitely had some good analyses/explanations in there about certain things I hadn't given a lot of thought to.
Cheers
Why do ignition setups struggle with low RPM?
Started by
Heath
, Dec 28 2009 02:02 PM
36 replies to this topic
#26
Heath
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I like cars.
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Posted 09 January 2010 - 11:02 PM
#27
_Gunmetal LH_
_Gunmetal LH_
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Posted 09 January 2010 - 11:25 PM
No worries. Yes, I'm a dreamer. 
Edited by Gunmetal LH, 09 January 2010 - 11:25 PM.
#28
_beergut_
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Posted 13 January 2010 - 07:14 PM
is this that fraud problem?
meh change leads and plugs
then check for compression/blown head gasket
sparks don't like firing through water either lol
easy fix is a rag/petrol/match in that order lol
meh change leads and plugs
then check for compression/blown head gasket
sparks don't like firing through water either lol
easy fix is a rag/petrol/match in that order lol
#29
_ass308_
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Posted 14 January 2010 - 07:50 AM
hi heath
from ice ignition website,
its a paragraph from half way down the page.
The biggest difference between the IC&E system and its CDI counterparts, is the amount of total spark energy available between 1000 rpm and 8000 rpm or higher. Where the IC&E system maintains a set intensity level with a varying amount of spark duration in time, to provide a constant amount of crank degrees of spark duration throughout the entire RPM range, CDI systems have a set intensity level and a set amount of spark duration in time, resulting in a short amount of crank degrees of spark duration at low to mid RPM levels, only growing to a reasonable level at the upper extremities (8000 rpm plus) of the RPM range. Even then, they cannot provide the spark duration of an IC&E system. To understand this more fully, consider if 1.0 millisecond of spark equals 22 degrees of spark duration at 4000 rpm, then 0.5 of a millisecond of spark equals 22 degrees of spark duration at 8000 rpm. Conversely, if 0.15 of a millisecond of spark equals 3.3 degrees of spark duration at 4000 rpm, then 0.15 of a millisecond of spark will equal 6.6 degrees of spark duration at 8000 rpm.
if u want to read more
http://www.iceignition.com/
from ice ignition website,
its a paragraph from half way down the page.
The biggest difference between the IC&E system and its CDI counterparts, is the amount of total spark energy available between 1000 rpm and 8000 rpm or higher. Where the IC&E system maintains a set intensity level with a varying amount of spark duration in time, to provide a constant amount of crank degrees of spark duration throughout the entire RPM range, CDI systems have a set intensity level and a set amount of spark duration in time, resulting in a short amount of crank degrees of spark duration at low to mid RPM levels, only growing to a reasonable level at the upper extremities (8000 rpm plus) of the RPM range. Even then, they cannot provide the spark duration of an IC&E system. To understand this more fully, consider if 1.0 millisecond of spark equals 22 degrees of spark duration at 4000 rpm, then 0.5 of a millisecond of spark equals 22 degrees of spark duration at 8000 rpm. Conversely, if 0.15 of a millisecond of spark equals 3.3 degrees of spark duration at 4000 rpm, then 0.15 of a millisecond of spark will equal 6.6 degrees of spark duration at 8000 rpm.
if u want to read more
http://www.iceignition.com/
#30
TerrA LX
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Posted 14 January 2010 - 09:06 PM
^ not sure I get that, are they saying they can discharge a "longer spark"?
#31
_Bomber Watson_
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Posted 14 January 2010 - 09:11 PM
They are saying they are better than everyone else.
I understand exactly what they mean though, still.....
Advertising bla bla.
Is kinda true though.
Thats why MSD displaces multiple sparks (wonder where the name come from...) below 3000rpm.
Cheers.
I understand exactly what they mean though, still.....
Advertising bla bla.
Is kinda true though.
Thats why MSD displaces multiple sparks (wonder where the name come from...) below 3000rpm.
Cheers.
Edited by Bomber Watson, 14 January 2010 - 09:12 PM.
#32
_ass308_
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Posted 14 January 2010 - 09:57 PM
yes terra lx,thats my understanding.
totaly understand your point bomber.strip out the sales pitch though.
spot on about the multiple spark at low revs.
totaly understand your point bomber.strip out the sales pitch though.
spot on about the multiple spark at low revs.
#33
TerrA LX
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Posted 14 January 2010 - 10:16 PM
Isn't that a play on words, duration is the measurement of time in degrees correct???
A spark plug will only use what energy is needed to jump the gap, at high rpm I would imagine increasing the length of the spark would shorten the saturation time of the coil for the next spark.
From my old days of setting up the dizzy duration was a figure used for the time the points closed, to saturate the coil, not the length of the spark.
A spark plug will only use what energy is needed to jump the gap, at high rpm I would imagine increasing the length of the spark would shorten the saturation time of the coil for the next spark.
From my old days of setting up the dizzy duration was a figure used for the time the points closed, to saturate the coil, not the length of the spark.
#34
_Bomber Watson_
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Posted 14 January 2010 - 10:52 PM
totaly understand your point bomber.strip out the sales pitch though.
What sales pitch? yes i like the stuff but i wasnt trying to sell gear for them. Was comparing IC&E's "longer duration at low rpm" to MSD's "Multiple Spark Discharge" at lower rpm.
Terra, you got it backwards mate, they lengthen the spark duration at lower rpm and shorten it at higher rpm, which is exactly what points do....
Cheers.
#35
_ass308_
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Posted 15 January 2010 - 09:04 AM
it wasnt your sales pitch bomber.theres 
#36
_Bomber Watson_
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Posted 15 January 2010 - 07:09 PM
AAaaaahhhhhh, sweet.
Just used to people flaming me for being a salesman every time i mention MSD lol. Must say im a little bit in love with the gear.
No worries.
Cheers.
Just used to people flaming me for being a salesman every time i mention MSD lol. Must say im a little bit in love with the gear.
No worries.
Cheers.
#37
N/A-PWR
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Posted 23 August 2014 - 05:30 PM
No multiple spark at high rpm DJ,
at what point does the multiple spark change to a single spark Mate?
MSD's "Multiple Spark Discharge" at lower rpm.
Cheers.
I have only had single spark motors, so just learning here.
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