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In the past when I was still using Mefi 3 ecms, we use to get a ton of interference from the MSD box. We would disconnect the ignition on the engine and just use a stock GM coil to do the tuning. We would then hook up the MSD box and coil on the power pulls. We did make a few pulls without the box and with the stock GM coil and there was no difference in power.
Eric, I'm pretty sure that you will not see any power difference with a different coil as long as the existing coil is sufficient....which it is. Eddie |
Originally Posted by stevesxm
(Post 3593560)
there is always the presumption that the consumer know what he's doing/buying , however. internal resistance of the coil is a key component in the slection process. points coils are not the same internal resistance as coils for transistor ignitions and not all transistor ignitions use the same type of coil. put a transistor "spec" coil on a points set up and the spark will be weak. put a points coil on a transistor set up and it will often burn the amplifier, especially if you leave the ignition on w/ out the motor running...
each ignition type and each transistor ignition will have its own requirement for coil internal resistance which is on the sheet of paper that was in the box when you bought it and you threw away without reading it. The recommendation was from a guy that has been troubleshooting and rebuilding MSD boxes with better quality components than MSD uses, for many years. He has researched the components and the recommended coil to be a match. I used his recommendation from his years of experience. The coil I orignally used, was a source of problems in a lot of situations, according to him. Just sharing what I have been told. |
I did a ton of research into different coils and the blue HVC from MSD had the longest spark duration at the highest current and voltage. The specs on that coil were almost double anything else. When you've just spent $12k to rebuild your motor, why skimp on the coil. I will say this, the motor idles like a dream now and acceleration is amazing. My engine builder told me that a racer he builds for changed to the HVC and gained 40hp. The size and duration of the spark can effect the overall burn rate. I guess it depends on combustion chamber, piston dome, load, fuel etc.
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Originally Posted by ThisIsLivin
(Post 3594774)
I did a ton of research into different coils and the blue HVC from MSD had the longest spark duration at the highest current and voltage. The specs on that coil were almost double anything else. When you've just spent $12k to rebuild your motor, why skimp on the coil. I will say this, the motor idles like a dream now and acceleration is amazing. My engine builder told me that a racer he builds for changed to the HVC and gained 40hp. The size and duration of the spark can effect the overall burn rate. I guess it depends on combustion chamber, piston dome, load, fuel etc.
if you actually believe... REALLY believe that a coil change made 40 more hp, then i am surprised you don't own all the swampland there is for sale in florida along with more than one major big city bridge. in that unique case that particuar engine builder can only have had the original ignition system so comprehensively wrong that his " magic 40 hp coil " was only one single part of the fix which probably included not putting the distributor in upside down. claims like these are just plain stupid. more voodoo and folklore. |
you just need enough spark to do the job, any more than that just shortens the life of the plugs, wires, caps and rotors.
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Originally Posted by stevesxm
(Post 3595308)
if you actually believe... REALLY believe that a coil change made 40 more hp, then i am surprised you don't own all the swampland there is for sale in florida along with more than one major big city bridge.
in that unique case that particuar engine builder can only have had the original ignition system so comprehensively wrong that his " magic 40 hp coil " was only one single part of the fix which probably included not putting the distributor in upside down. claims like these are just plain stupid. more voodoo and folklore. |
Originally Posted by kvogt
(Post 3595450)
you just need enough spark to do the job, any more than that just shortens the life of the plugs, wires, caps and rotors.
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I am not very knowledgeable about the complex function of the ignition systems, but I thought that the MSD system fires multiple times during ignition resulting in more complete combustion of the air fuel mixture. Since the coil is responsible for creating the voltage at the time and duration signaled by the box it would seem an important part of the system. Why do you think MSD created the $140 HVC when the blasters and High vibrations are under $50. Is there a difference in the coil's ability to recover at higher rpm's? Or is it just an opportunity to turn a better profit?
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Originally Posted by SkiDoc
(Post 3595662)
I am not very knowledgeable about the complex function of the ignition systems, but I thought that the MSD system fires multiple times during ignition resulting in more complete combustion of the air fuel mixture. Since the coil is responsible for creating the voltage at the time and duration signaled by the box it would seem an important part of the system. Why do you think MSD created the $140 HVC when the blasters and High vibrations are under $50. Is there a difference in the coil's ability to recover at higher rpm's? Or is it just an opportunity to turn a better profit?
I believe you can gain 40hp on lots of combinations, all of which, were NOT right to start with. That's the problem. If your engine is completely not running correctly, say you have WAY to much gap or something and you install a stronger coil, will the engine make gobs more power, yup. If you had just gapped the plugs correctly would you increase the power ~the same amount, yup. |
Originally Posted by SkiDoc
(Post 3595662)
I am not very knowledgeable about the complex function of the ignition systems, but I thought that the MSD system fires multiple times during ignition resulting in more complete combustion of the air fuel mixture. Since the coil is responsible for creating the voltage at the time and duration signaled by the box it would seem an important part of the system. Why do you think MSD created the $140 HVC when the blasters and High vibrations are under $50. Is there a difference in the coil's ability to recover at higher rpm's? Or is it just an opportunity to turn a better profit?
http://www.ehow.com/facts_6945909_ms...utm_source=ask |
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