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MSD Blaster Coils any good?

I have been running that exact coil for around 7 years. They are better than the stock coils. The stockers have a tendancy to saturate and start missing at high RPM. The MSD works fine to 5k and beyond.
 
Forgot to add... If you open up the sparkplug gap .005 or so it helps with gas milage.
I run mine at .042. TBI likes to run a little lean at cruise the higher voltage and larger gap helps.
 
MSD products are generally pretty good, unlike some of the other aftermarket ignition brands. I am running the in-cap HEI coil and spent a lot of time tuning my ignition drive for it. It only needs about 1/3 of the dwell time the stock one needs. Charged to the same current, it sparks harder, too. To take the most advantage of this, a stock HEI module is not the right choice. The description in your link says it is compatible with stock electronics, so the inductance must be similar to the stock coil.

It's always good to have a spare ignition coil anyway. Hard to get home without one.
 
I am running an aftermarket module to.(DUI) but mine increses dwell so the coil has a longer saturation tIme. Gives me a longer hotter spark. Good for MPG. Performance is good but at 3.50 a gal. I will gladly give up a faster truck for better MPG.
 
Thunder said:
I have been running that exact coil for around 7 years. They are better than the stock coils. The stockers have a tendancy to saturate and start missing at high RPM. The MSD works fine to 5k and beyond.
Click to expand...

This is what the problem with my ignition is sometimes...Im guessing the MSD box, and plugs gapped a .05 dont help either.:DOne of these coils is on my list so ima going to subscribe.
 
broncoman6524 said:
This is what the problem with my ignition is sometimes...Im guessing the MSD box, and plugs gapped a .05 dont help either.:DOne of these coils is on my list so ima going to subscribe.
Click to expand...
If you are running a MSD box (6AL?) a MSD or other performance coil is a must have.
 
i run a 6A. I originally didn't ground the box to my battery (fender instead) and it would break up at like 3500-4k. I talked to MSD and they said to ground it at my battery, that solved most of the problem. It isn't nearly as fussy anymore, but I personally believe that if it's hotter outside or the motor is, the more it will break up.

Now that it's cold out, It doesnt *seem* to do it as much. Mine also would stumble upon immediate acceleration.
 
Thunder said:
I am running an aftermarket module to.(DUI) but mine increses dwell so the coil has a longer saturation tIme. Gives me a longer hotter spark.
Click to expand...
If the coil has lower primary inductance, then you want a shorter dwell. Shorter dwell requirement is the only way to get full strength spark at high rpm without switching to multiple coils. From what I've seen of stock-type modules, they typically don't dwell long enough, especially if you have a cheap coil. If you use a "longer-dwell" module with an improved coil, you might actually have too much dwell time. A good module will compensate for this with over-current protection. It's not a problem, but with a good coil, a longer dwelling module might not provide any improvement.

Can you have too much coil drive? Yes. I was charging my coil to 8A for every spark and within a couple of days the carbon button under the coil melted the distributor cap. I found a lower resistance button, but I also discovered that backing off the dwell time did not degrade idle quality or anything.
 
Granted shorter dwell time is good for high RPM. So is a smaller plug gap. I am not interested in high rpm power. I want low RPM power. Gas mileage, throttle response, and torque is what I want. It is what I built my engine to do. Increasing the dwell gives a better spark at lower RPMs along with a wider spark plug gap, and MSD coil. My K5 runs great all the way to 5K rpm where it quits breathing and gets me 17- 18 MPG highway. Thats with 33" MTs and a 4" lift. With gas going up and up. I will gladly give up power on the top end To get better MPG. My truck aint no 5000 lb drag racer.
 
I agree with everything you are saying, unless you are implying that more dwell is always better. Once the coil saturates, increasing dwell doesn't help anything. It just heats up the coil and module, helping them to fail faster. The only way to know is to measure the coil current with an oscilloscope.
 
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