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motomwo Samba Member
Joined: February 10, 2017 Posts: 261 Location: Oregon
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Posted: Tue Sep 27, 2022 4:28 pm Post subject: CB performance magna spark dry coil specs? |
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I am running the CB magna spark distributor and dry coil in my 2127 motor and has started developing a high RPM misfire. Misfire started about 5500 rpm and after installing a new set of plugs it improved slightly but now starts misfiring at 6000rpm.
I checked the coil and the primary side is reading 1.3-1.4 ohms and the secondary side is measuring 15.9K ohms.
Does anyone know if these are normal coil readings for the CB coil? The secondary side seams high to me. _________________ 1961 Bug, 2276 cb wedge ports 44x37 11.1 comp fk10 1.5 rockers 48idf's 1 3/4" header Rancho pro street trans SAW axles Airkewld 4# narrowed beam, Koni shocks, Airkewld dis brake all around. 5.5/4.5 BRMs
1966 Bug, 2127, panchito heads, fk8, 1.3 rockers, dual 44idfs, 1 5/8 merge header, Rancho pro strt flyer, empi axles, Airkewld's 4" beam and discs all around and adjustable shocks. 4.5 & 5.5 BRMs |
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jpaull Samba Member
Joined: February 22, 2005 Posts: 3456 Location: Paradise, Ca
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Posted: Tue Sep 27, 2022 9:56 pm Post subject: Re: CB performance magna spark dry coil specs? |
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Specs are 1.1 and 13.5, so yours are abit high yes. _________________ [email protected] MPH 1/4 Mile & 8.1 @ 83.7MPH in 1/8 Mile with Mild Type 1 VW Mag Case 2234cc commuter engine in stock weight bug w/only .491 total lift(CB2292 Cam), 42x37 heads, 48idf's, Street tires, Belt on, Mufflers, Pump gas, video of the run here: https://youtu.be/M3SPqMOKAOg
Transmission by MCMScott:
Rhino case, Klinkenberg 4.12, Superdiff, 002 mainshaft with 091 first idler. Weddle 1.48 Third & 1.14 Fourth. |
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motomwo Samba Member
Joined: February 10, 2017 Posts: 261 Location: Oregon
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Posted: Wed Sep 28, 2022 7:03 am Post subject: Re: CB performance magna spark dry coil specs? |
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Jeff, Thank you very much for the specs on the CB coil. I will try and call CB today and see if they know if the coil ohm measurements, I am getting are enough to cause the problem.
Marty _________________ 1961 Bug, 2276 cb wedge ports 44x37 11.1 comp fk10 1.5 rockers 48idf's 1 3/4" header Rancho pro street trans SAW axles Airkewld 4# narrowed beam, Koni shocks, Airkewld dis brake all around. 5.5/4.5 BRMs
1966 Bug, 2127, panchito heads, fk8, 1.3 rockers, dual 44idfs, 1 5/8 merge header, Rancho pro strt flyer, empi axles, Airkewld's 4" beam and discs all around and adjustable shocks. 4.5 & 5.5 BRMs |
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Lingwendil Samba Member
Joined: February 25, 2009 Posts: 3987 Location: Antioch, California, a block from the hood
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Posted: Wed Sep 28, 2022 8:19 am Post subject: Re: CB performance magna spark dry coil specs? |
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jpaull wrote: |
Specs are 1.1 and 13.5, so yours are abit high yes. |
Direct from CB-
Quote: |
Features
Turns Ratio: 72:1
Inductance: 8 mh
Primary Resistance: 1.1 OHMs
Secondary Resistance: 13.5K OHMs
Maximum Voltage: 30,000 Volts
Peak Current: 45 mA
Spark Duration: 2.5 mS |
https://www.cbperformance.com/product-p/2009.htm
Sure beats a Bosch blue if you can drive the low primary resistance, wonder how they would do with a CDI?
Also, original OEM application is Mitsubishi PN: MD146982, OEM for 1990-1996 Mitsubishi Mighty Max, Dodge Ram 50 with 2.4L 4G64 engine, interestingly enough.
Was thinking of picking one up to run off of a TFI module on my car. _________________ 73 super beetle thread http://www.thesamba.com/vw/forum/viewtopic.php?t=649622 Back on the Road!
Modify your Kadrons for SVDA http://www.thesamba.com/vw/forum/viewtopic.php?p=8115884#8115884
Cast iron VJU4BR8 SVDA reference thread- https://www.thesamba.com/vw/forum/viewtopic.php?t=...mp;start=0
Need replacement filters for original Kadron aircleaners? WIX #42087 is a perfect fit, as is Napa Gold #2087! |
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Dauz Samba Member
Joined: January 05, 2010 Posts: 1790
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Posted: Wed Sep 28, 2022 8:40 am Post subject: Re: CB performance magna spark dry coil specs? |
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Gap too big |
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motomwo Samba Member
Joined: February 10, 2017 Posts: 261 Location: Oregon
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Posted: Wed Sep 28, 2022 9:17 am Post subject: Re: CB performance magna spark dry coil specs? |
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I have been using .030" gap forever and was never a problem before. But I understand what you are getting at. Thank you. _________________ 1961 Bug, 2276 cb wedge ports 44x37 11.1 comp fk10 1.5 rockers 48idf's 1 3/4" header Rancho pro street trans SAW axles Airkewld 4# narrowed beam, Koni shocks, Airkewld dis brake all around. 5.5/4.5 BRMs
1966 Bug, 2127, panchito heads, fk8, 1.3 rockers, dual 44idfs, 1 5/8 merge header, Rancho pro strt flyer, empi axles, Airkewld's 4" beam and discs all around and adjustable shocks. 4.5 & 5.5 BRMs |
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motomwo Samba Member
Joined: February 10, 2017 Posts: 261 Location: Oregon
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Posted: Wed Sep 28, 2022 9:18 am Post subject: Re: CB performance magna spark dry coil specs? |
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Lingwendil wrote: |
jpaull wrote: |
Specs are 1.1 and 13.5, so yours are abit high yes. |
Direct from CB-
Quote: |
Features
Turns Ratio: 72:1
Inductance: 8 mh
Primary Resistance: 1.1 OHMs
Secondary Resistance: 13.5K OHMs
Maximum Voltage: 30,000 Volts
Peak Current: 45 mA
Spark Duration: 2.5 mS |
https://www.cbperformance.com/product-p/2009.htm
Sure beats a Bosch blue if you can drive the low primary resistance, wonder how they would do with a CDI?
Also, original OEM application is Mitsubishi PN: MD146982, OEM for 1990-1996 Mitsubishi Mighty Max, Dodge Ram 50 with 2.4L 4G64 engine, interestingly enough.
Was thinking of picking one up to run off of a TFI module on my car. |
Great enough to know! _________________ 1961 Bug, 2276 cb wedge ports 44x37 11.1 comp fk10 1.5 rockers 48idf's 1 3/4" header Rancho pro street trans SAW axles Airkewld 4# narrowed beam, Koni shocks, Airkewld dis brake all around. 5.5/4.5 BRMs
1966 Bug, 2127, panchito heads, fk8, 1.3 rockers, dual 44idfs, 1 5/8 merge header, Rancho pro strt flyer, empi axles, Airkewld's 4" beam and discs all around and adjustable shocks. 4.5 & 5.5 BRMs |
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Lingwendil Samba Member
Joined: February 25, 2009 Posts: 3987 Location: Antioch, California, a block from the hood
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motomwo Samba Member
Joined: February 10, 2017 Posts: 261 Location: Oregon
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Posted: Wed Sep 28, 2022 10:43 am Post subject: Re: CB performance magna spark dry coil specs? |
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OK problem fixed. I talked to Mark at CB and he said the coil specs I measured were still within a good range with no vibration (motor not running). So just to test I installed my known good 1.5 ohm Pertronix coil and test drove and all is good. revs smoothly without hiccups' all up to 6500rpm in all four gears.
So time for a new coil! Thank you all for your help and inputs.
I don't know if I can trust using another CB coil as it only had about 1600 miles on it and cam break-in time on the motor start up stand.
Marty _________________ 1961 Bug, 2276 cb wedge ports 44x37 11.1 comp fk10 1.5 rockers 48idf's 1 3/4" header Rancho pro street trans SAW axles Airkewld 4# narrowed beam, Koni shocks, Airkewld dis brake all around. 5.5/4.5 BRMs
1966 Bug, 2127, panchito heads, fk8, 1.3 rockers, dual 44idfs, 1 5/8 merge header, Rancho pro strt flyer, empi axles, Airkewld's 4" beam and discs all around and adjustable shocks. 4.5 & 5.5 BRMs |
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Brian_e Samba Member
Joined: July 28, 2009 Posts: 3228 Location: Rapid City, SD
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Posted: Wed Sep 28, 2022 10:59 am Post subject: Re: CB performance magna spark dry coil specs? |
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Just a heads up here.....
Myself and a buddy both had issues with the spade terminal tabs coming loose and causing misfires. We both cinched down the nuts that were loose, and they have been great ever since.
I had 25k on mine with no issues other than the loose nuts.
So make sure to snug up the spade tab nuts when you install it.
Brian _________________ www.type-emotorsports.com |
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motomwo Samba Member
Joined: February 10, 2017 Posts: 261 Location: Oregon
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Posted: Wed Sep 28, 2022 11:02 am Post subject: Re: CB performance magna spark dry coil specs? |
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Thanks Brian, Yep I checked that because I had to remove the tabs and put them on the Pertronix coil. The nuts were still tight on the CB coil.
Marty _________________ 1961 Bug, 2276 cb wedge ports 44x37 11.1 comp fk10 1.5 rockers 48idf's 1 3/4" header Rancho pro street trans SAW axles Airkewld 4# narrowed beam, Koni shocks, Airkewld dis brake all around. 5.5/4.5 BRMs
1966 Bug, 2127, panchito heads, fk8, 1.3 rockers, dual 44idfs, 1 5/8 merge header, Rancho pro strt flyer, empi axles, Airkewld's 4" beam and discs all around and adjustable shocks. 4.5 & 5.5 BRMs |
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jimmyhoffa Samba Member
Joined: February 16, 2014 Posts: 1047 Location: St. Louis
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Posted: Wed Sep 28, 2022 11:29 am Post subject: Re: CB performance magna spark dry coil specs? |
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FWIW, I got a CB Coil a few years ago as part of a complete Magnaspark system, using CBs Wires and NGK plugs from CB as well. It died in less time than an oil change- leaking black goo all over my intake system.
I got another one in the last few weeks for my new build and it was DOA. I got ahold of ANOTHER one from an acquaintance and that's what I'm running now.
So in summary, I'm on my 3rd CB Dry Pack coil in under 2000 miles. I assure you there are no electrical issues in my car to prompt this. Good performer and a very simple setup but carry a spare, for SURE. _________________ 1974 Chenowth 2RL #1244 Street Legal
My other car isn't ridiculous. |
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Lingwendil Samba Member
Joined: February 25, 2009 Posts: 3987 Location: Antioch, California, a block from the hood
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Posted: Wed Sep 28, 2022 11:44 am Post subject: Re: CB performance magna spark dry coil specs? |
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Brian_e wrote: |
Just a heads up here.....
Myself and a buddy both had issues with the spade terminal tabs coming loose and causing misfires. We both cinched down the nuts that were loose, and they have been great ever since.
I had 25k on mine with no issues other than the loose nuts.
So make sure to snug up the spade tab nuts when you install it.
Brian |
Maybe some small nylock nuts and a wavy washer would be a good idea? I do that on my canister types with no issues. _________________ 73 super beetle thread http://www.thesamba.com/vw/forum/viewtopic.php?t=649622 Back on the Road!
Modify your Kadrons for SVDA http://www.thesamba.com/vw/forum/viewtopic.php?p=8115884#8115884
Cast iron VJU4BR8 SVDA reference thread- https://www.thesamba.com/vw/forum/viewtopic.php?t=...mp;start=0
Need replacement filters for original Kadron aircleaners? WIX #42087 is a perfect fit, as is Napa Gold #2087! |
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Dauz Samba Member
Joined: January 05, 2010 Posts: 1790
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Posted: Wed Sep 28, 2022 12:40 pm Post subject: Re: CB performance magna spark dry coil specs? |
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motomwo wrote: |
I have been using .030" gap forever and was never a problem before. But I understand what you are getting at. Thank you. |
If you're convinced it's not your plug gap and you're missing at high rpm, then you should be chasing after your A/F ratio or clean your main jets (if carb). But humor me, close the gap to .28 and tell me what happens. You already said NEW plugs helped.
Or, try hotter plugs
Last edited by Dauz on Wed Sep 28, 2022 1:24 pm; edited 1 time in total |
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slalombuggy Samba Member
Joined: July 17, 2010 Posts: 9131 Location: Canada
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Posted: Wed Sep 28, 2022 12:50 pm Post subject: Re: CB performance magna spark dry coil specs? |
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I got a bad coil from CB on my Gen4 system, it was bad from the start. I wish I had those weeks of my life back trying to figure out what I did wrong. The really crappy part was when I got all the stuff I looked at the coil and thought I should just order a MSD or Accel to replace this cheap looking POS. I wish I had. |
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Dauz Samba Member
Joined: January 05, 2010 Posts: 1790
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Posted: Wed Sep 28, 2022 1:23 pm Post subject: Re: CB performance magna spark dry coil specs? |
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I had one of those coils (if it's the same) paired with my CB Digital. The system ran tip top. Of course with boost or high copression you have to gap your plugs closer cuz it's harder for the spark to jump.
One rat's head in my KFC and I'll never eat there again. Maybe.. . |
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