Ignition control modules?
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Freshman User
Joined: May 2004
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Ignition control modules?
Is there anything to be gained by changing a Duraspark II ignition module to a MSD 6A. I have a 1979 F150 4x4 stock 351M motor. I am wanting smooth performance and low end torque; no racing. Thanks for your advise.
Moderator
Joined: Jan 2001
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From: Virginia
In a stock motor in good condition, I see no use in buying one. If you have modified the engine, then yes you could see some benefit. I have heard of people having some problems, and the msd ignition was covering these up and made it run smoother, but if it's running good now, I would not change it.
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Freshman User
Joined: May 2004
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Thanks for responding. I have read a number of posts saying pro & con stuff about the MSD module but never found any indication of how it works or what makes it better than the stock item. Can you or anyone esle explain the basics to me?
Moderator
Joined: Jan 2001
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From: Virginia
Well, the first thing is it's a CD ignition. Instead of using 12 volts to charge up the ignition coil, it uses capacitors which can store a lot of energy to charge up the coil. This produces a higher voltage at the plugs. Higher voltages can jump wider gaps, and also jump in leaner fuel mixtures, and higher compression ratios/supercharged cylinders where there is more air (harder) for the spark to jump through.
They also send out multiple sparks at low rpms(MSD=multiple spark discharge I think). A regular ignition system sends out one spark, while the MSD sends out several-if the first one doesn't light it off completely, several more are there to fire it.
They also send out multiple sparks at low rpms(MSD=multiple spark discharge I think). A regular ignition system sends out one spark, while the MSD sends out several-if the first one doesn't light it off completely, several more are there to fire it.
Mountain Pass
Joined: Jan 2002
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From: Ft. Pierce Fl usa
The good and the bad. First the good it does make the engine run and start better. The bad, I have never gotten a good tach reading after the MSD stuff including the tach adapter. Second I am using the third MSD6A in as many years, thats not very good.
I have found no alternative though.
MT
I have found no alternative though.
MT
