the coil thread
#51
10000 RPM Lane
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Jalai has more accurate info on the IGN-1A coil too. If you offer to send him coils he'll probably agree to provide a direct comparison graph listing them all together. Pulling ingo from various sources can result in inaccuracies.
ps: was wondering when you were finally going to start this thread
ps: was wondering when you were finally going to start this thread
#53
Something you may wish to try which I have used for several years is 6V coils, for example Bosch GT40R, any coil which is fitted to a vehicle with a ballast resistor. I run 4x 6V coils on my 12A PP and punish it (circuit car) the thing does 10K rpm constantly. Obviously Boost and water etc change spark requirements but I'd be interested to see how a 6V coil performs on your scope, I'm guessing from your previous experiments with increased voltage on 12V coils is that it would simply achieve full saturation very quickly.
#54
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I'll admit this isn't 100% relevant but I ran across this a few weeks ago and thought it was interesting especially when it talks about the MSD 6A. The link is to a post by Paul Yaw (you know that carburetor guy and who is now involved with Injector Dynamics) about the ignition system but also about the plugs.
ignition
ignition
#55
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I'll admit this isn't 100% relevant but I ran across this a few weeks ago and thought it was interesting especially when it talks about the MSD 6A. The link is to a post by Paul Yaw (you know that carburetor guy and who is now involved with Injector Dynamics) about the ignition system but also about the plugs.
ignition
ignition
i actually did use the autolite spark plugs 2526 to tune the P port, as they are $3 each, so i had no problem going through a couple sets while tuning the carb.
i can't comment on power as i didn't use the autolites @wot, but the autolites will actually idle leaner than the NGK's.
#57
destroy, rebuild, repeat
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i can, but really you shouldnt even mess with those. i believe the problem high output/low energy coils is spark blowout. sure they may be good a initially lighting a rich mixture, but if the spark gets extinguished by turbulent flow or non-uniform mixture conditions (super rich or high water content), they do not have enough energy to re-light the spark. The long combustion chamber of the rotary engine makes this a bigger issue than with cylinder engines. I believe this is why CDI and big inductive ignitions work so well with rotaries. i noticed a night and day difference switching from IGN-1A coils (high output/low duration) back to factory FC coils (low output/long duration)
imo, the best ignition you can get would be four FC trailing coils with a Bosche 4-channel ignitor like this:
Bosch 0 227 100 211 Ignition Control with MegaSquirt-II
It has higher current limit than the FC ignitors, charge to 4ms.
if you are having misfires with that setup, move up to CDI.
If you must go aftermarket, IGN-1A coils would be the next best option
imo, the best ignition you can get would be four FC trailing coils with a Bosche 4-channel ignitor like this:
Bosch 0 227 100 211 Ignition Control with MegaSquirt-II
It has higher current limit than the FC ignitors, charge to 4ms.
if you are having misfires with that setup, move up to CDI.
If you must go aftermarket, IGN-1A coils would be the next best option
#58
Full Member
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i can, but really you shouldnt even mess with those. i believe the problem high output/low energy coils is spark blowout. sure they may be good a initially lighting a rich mixture, but if the spark gets extinguished by turbulent flow or non-uniform mixture conditions (super rich or high water content), they do not have enough energy to re-light the spark. The long combustion chamber of the rotary engine makes this a bigger issue than with cylinder engines. I believe this is why CDI and big inductive ignitions work so well with rotaries. i noticed a night and day difference switching from IGN-1A coils (high output/low duration) back to factory FC coils (low output/long duration)
imo, the best ignition you can get would be four FC trailing coils with a Bosche 4-channel ignitor like this:
Bosch 0 227 100 211 Ignition Control with MegaSquirt-II
It has higher current limit than the FC ignitors, charge to 4ms.
if you are having misfires with that setup, move up to CDI.
If you must go aftermarket, IGN-1A coils would be the next best option
imo, the best ignition you can get would be four FC trailing coils with a Bosche 4-channel ignitor like this:
Bosch 0 227 100 211 Ignition Control with MegaSquirt-II
It has higher current limit than the FC ignitors, charge to 4ms.
if you are having misfires with that setup, move up to CDI.
If you must go aftermarket, IGN-1A coils would be the next best option
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#61
Exhaust Manifold Leak
general rule of thumb is double voltage, half the dwell time or is it no so easy? the idea of using 6v coils seems the way ahead with a good ignitor that can cope with the current. is there infoi out there of the 12A J109 ignitors in term of dwell and current limit? On our PP rx3 we now run 4 of these in direct fire layout. I noticed that one ignitor is having different dwell than the other 3 when checking with a scope. but even at 10k rpm the coils feel they were only doing 5k in stock wasted spark dizzy config =)
We are running the ls2 truck coils on a renesis with 5ms dwell and megasquirt ecu. no prolbems to 9000 rpm on circuit for 2 years..
We are running the ls2 truck coils on a renesis with 5ms dwell and megasquirt ecu. no prolbems to 9000 rpm on circuit for 2 years..
#62
B O R I C U A
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i can, but really you shouldnt even mess with those. i believe the problem high output/low energy coils is spark blowout. sure they may be good a initially lighting a rich mixture, but if the spark gets extinguished by turbulent flow or non-uniform mixture conditions (super rich or high water content), they do not have enough energy to re-light the spark. The long combustion chamber of the rotary engine makes this a bigger issue than with cylinder engines. I believe this is why CDI and big inductive ignitions work so well with rotaries. i noticed a night and day difference switching from IGN-1A coils (high output/low duration) back to factory FC coils (low output/long duration)
imo, the best ignition you can get would be four FC trailing coils with a Bosche 4-channel ignitor like this:
Bosch 0 227 100 211 Ignition Control with MegaSquirt-II
It has higher current limit than the FC ignitors, charge to 4ms.
if you are having misfires with that setup, move up to CDI.
If you must go aftermarket, IGN-1A coils would be the next best option
imo, the best ignition you can get would be four FC trailing coils with a Bosche 4-channel ignitor like this:
Bosch 0 227 100 211 Ignition Control with MegaSquirt-II
It has higher current limit than the FC ignitors, charge to 4ms.
if you are having misfires with that setup, move up to CDI.
If you must go aftermarket, IGN-1A coils would be the next best option
#64
Exhaust Manifold Leak
I must say we run in direct fire, so not wasted spark, maybe when running wasted spark you might run into problems? With the megasquirt you can easy find out by using the output test and having them run for half an hour or an hours to check the temperature on the coils.
#67
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12v/1ohm = 12 amps.
at 14v/1ohm = 14 amps.
for a normal car you would probably run a 20A fuse, and maybe for something used harder a 30a fuse.
Mazda runs a 30A fuse, so maybe the coils don't draw 12amps constantly
#68
IGN-1A Duty Cycle
ARMCHAIR : GOLDEN Rule #1 6000 RPM=10ms, thus 12000 RPM=5ms !
WHEN 8500 RPM is reached @ 6ms Coil Dwell a "duty cycle" of about 90% is reached.
Safe with ONLY an accurate "degree bases" EMS though not recommended.
A better SAFE coil dwell would 5.5ms.
This will produce 150mj of coil energy
Next, the IGN-1A coil specification for testing, set by Mercury Racing, IS 14volts @ 8 amps providing 102mj @ a 2.05ms coil dwell.
FEED your coils the 25 AMPS they require AND the dwell they can support 8.8ms.
YOU WILL get the same results as Jalai Lane, about 280mj.
The OLD version IGN-1CD NOW sold by M&W, will also solve the charge time though they state 115 mj of energy.
The PRO-DRAG CDI could by higher though it is "run time" limited to 10 seconds AND draws the same current ?
THE MOST COMMON mistake made by installers IS coil boot length, including Peter's (Rice Racing), boot design.
The plug boot MUST touch the steel of the sparkplug leaving NO "air gap".
Lance
WHEN 8500 RPM is reached @ 6ms Coil Dwell a "duty cycle" of about 90% is reached.
Safe with ONLY an accurate "degree bases" EMS though not recommended.
A better SAFE coil dwell would 5.5ms.
This will produce 150mj of coil energy
Next, the IGN-1A coil specification for testing, set by Mercury Racing, IS 14volts @ 8 amps providing 102mj @ a 2.05ms coil dwell.
FEED your coils the 25 AMPS they require AND the dwell they can support 8.8ms.
YOU WILL get the same results as Jalai Lane, about 280mj.
The OLD version IGN-1CD NOW sold by M&W, will also solve the charge time though they state 115 mj of energy.
The PRO-DRAG CDI could by higher though it is "run time" limited to 10 seconds AND draws the same current ?
THE MOST COMMON mistake made by installers IS coil boot length, including Peter's (Rice Racing), boot design.
The plug boot MUST touch the steel of the sparkplug leaving NO "air gap".
Lance
#69
Rotor Head Extreme
iTrader: (8)
Next, the IGN-1A coil specification for testing, set by Mercury Racing, IS 14volts @ 8 amps providing 102mj @ a 2.05ms coil dwell.
FEED your coils the 25 AMPS they require AND the dwell they can support 8.8ms.
THE MOST COMMON mistake made by installers IS coil boot length, including Peter's (Rice Racing), boot design.
The plug boot MUST touch the steel of the sparkplug leaving NO "air gap".
Lance
FEED your coils the 25 AMPS they require AND the dwell they can support 8.8ms.
THE MOST COMMON mistake made by installers IS coil boot length, including Peter's (Rice Racing), boot design.
The plug boot MUST touch the steel of the sparkplug leaving NO "air gap".
Lance
Your saying that Ign-1a needs 25amps to run at it's full potential? I've been running 6 of these off my Haltechs 20amp relay fused feed at 4.7ms. Do I need to rewire for a 25amp feed? Can you eleborate on the plug boot touching the steel? Also were does someone get the long plug leads? I just re-did my spark plugs with Magnacore KV-85 wires and boots.
#70
Exhaust Manifold Leak
we can use Ohms law, v=i+r. the FSM says the coil resistance is under 1ohm, so
12v/1ohm = 12 amps.
at 14v/1ohm = 14 amps.
for a normal car you would probably run a 20A fuse, and maybe for something used harder a 30a fuse.
Mazda runs a 30A fuse, so maybe the coils don't draw 12amps constantly
12v/1ohm = 12 amps.
at 14v/1ohm = 14 amps.
for a normal car you would probably run a 20A fuse, and maybe for something used harder a 30a fuse.
Mazda runs a 30A fuse, so maybe the coils don't draw 12amps constantly
#72
Old [Sch|F]ool
Watching thread with interest. Probably will be converting my car to a four CNP setup, maybe eke a little more fuel economy from the engine than I am getting through the distributor/MSD setup. Plus four little coils will weigh less and take up less space than the pile of stuff I have under the hood now. And getting rid of the distributor will make room for the supercharger.
#73
Exhaust Manifold Leak
#74
www.lms-efi.com
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Your saying that Ign-1a needs 25amps to run at it's full potential? I've been running 6 of these off my Haltechs 20amp relay fused feed at 4.7ms. Do I need to rewire for a 25amp feed? Can you eleborate on the plug boot touching the steel? Also were does someone get the long plug leads? I just re-did my spark plugs with Magnacore KV-85 wires and boots.
That said, when I build harnesses for 20B engines with one of the Haltech harnesses, I use one of the spare fuse/relay spots in the box to add a second ignition power circuit and run 3 coils per circuit. That way i know I'm well within the design limits of the circuits. Running six coils off the single circuit will get you close to the 20A limit on a continuous basis. That's not good for longevity or coil performance.
#75
Dwell Truncation/Charge Saturation of IGN-1A
FIRST, look at Jalia's work showing the MAX CURRENT draw of the IGN-1A coil.
THIS SHOULD NEVER HAPPEN : When a coil is saturated the primary windings become a dead short "frying" a coil/IGBT.
MY "term" is Dwell Truncation when this happens@25 AMPs.
The Jalia Lane method IS a safe way to test, in a lab, using current limiting equipment.
Review of the current@6ms dwell may state 16 AMPs max understanding the duty cycle x number of coils will calculate the RMS required current supply.
You COULD have "overlapping dwell" at higher RPMs stating a higher primary current supply NEED.
This is just ALL math, not my law, Gods law.
NOW for the "boot" question, free air is a good conductor.
AGAIN, the spark plug boot needs to completely cover the plug insulator, using internal silicon grease, leaving NO air gap at the plug steel.
MANY here on the site HAVE witnessed this occur, (leaks) at my facility, when viewing spark plugs/plug boots being tested using my CO-2 eight channel pressure chamber, (a product/item a sell to all who ask).
Magnacore products are first class, they make MANY boots of different length.
When I have a fitment problem, I will buy a "longer" boot then trim to size.
Lance
THIS SHOULD NEVER HAPPEN : When a coil is saturated the primary windings become a dead short "frying" a coil/IGBT.
MY "term" is Dwell Truncation when this happens@25 AMPs.
The Jalia Lane method IS a safe way to test, in a lab, using current limiting equipment.
Review of the current@6ms dwell may state 16 AMPs max understanding the duty cycle x number of coils will calculate the RMS required current supply.
You COULD have "overlapping dwell" at higher RPMs stating a higher primary current supply NEED.
This is just ALL math, not my law, Gods law.
NOW for the "boot" question, free air is a good conductor.
AGAIN, the spark plug boot needs to completely cover the plug insulator, using internal silicon grease, leaving NO air gap at the plug steel.
MANY here on the site HAVE witnessed this occur, (leaks) at my facility, when viewing spark plugs/plug boots being tested using my CO-2 eight channel pressure chamber, (a product/item a sell to all who ask).
Magnacore products are first class, they make MANY boots of different length.
When I have a fitment problem, I will buy a "longer" boot then trim to size.
Lance