MSD Blaster Coil

[wolds]

Just wanted to post this as a "heads up" to all that just because you have purchased a new coil that you can assume that it is good. Recently purchased an MSD High Vibration blaster coil as part of my ignition upgrade from my old Permatune and stock coil setup on my 83SC RoW. I haven't purchased the MSD streetfire CDI yet (I'll do that next week), but I thought I'd get the new coil in hand. Out of the box the primary measured 0.9ohms which is good. The bad news is that the secondary measured open. Ordered a second coil which I received today and measured it. It also ohm'd out at about 0.9 on the primary, but I was happy to see the secondary ohm out at the expected 4.7K. So check these out when you purchase them, they're made in China and I'm guessing that the QA isn't the greatest. Warren

[timmy2]

Good catch, always check everything electrical when it is new.
Nothing worse than buying something and putting it away until you need it 2 days after the warranty expired!

[wwest]

Originally Posted by wolds

Just wanted to post this as a "heads up" to all that just because you have purchased a new coil that you can assume that it is good. Recently purchased an MSD High Vibration blaster coil as part of my ignition upgrade from my old Permatune and stock coil setup on my 83SC RoW. I haven't purchased the MSD streetfire CDI yet (I'll do that next week), but I thought I'd get the new coil in hand. Out of the box the primary measured 0.9ohms which is good. The bad news is that the secondary measured open. Ordered a second coil which I received today and measured it. It also ohm'd out at about 0.9 on the primary, but I was happy to see the secondary ohm out at the expected 4.7K. So check these out when you purchase them, they're made in China and I'm guessing that the QA isn't the greatest. Warren

With some DMMs it can take several seconds to overcome the secondary inductive impedance and get down to the wiring resistance.

[dicklague]

I would go with an E core coil and not a round one. these are a lot better for CDI. This one is from Daytona-Sensors for about $100.




Here is the Crane.


MSD has a couple of e-cores too.

I have the Daytona Sensors with their CD-1 ignition and love the set up.

[wwest]

Since MSD sells (relabeled?) ignition coils more appropriate to CDI (~30% more energy coupled to the secondary) I'm surprised they sold you the lower performance "I" core ignition coil.


MSD Blaster GM Coils, Ignition Coil, Blaster Performance Replacement, E-Core, Square, Epoxy, Red, 48,000 V, GM, Each

[wolds]

Originally Posted by wwest

With some DMMs it can take several seconds to overcome the secondary inductive impedance and get down to the wiring resistance.

Good point. My standard is a Fluke 87 which I use at work, but even the fluke clone I put together as a project many years ago had no problem reading the secondary resistance. Warren