msd ignition

we are running a msd 7al3 ignition box on a 547ci merlin bb chevy -2 brodix heads flowed 360@800 lift 871 littlefield, enderle 110 pump hat and port injectors in a fuel altered best time to date 4.46@156,the question is do you guys think we could run quicker with a good magneto, and which one would you recommend? thanks for the reply.

 

You should talk to Spud Miller at Fuel Injection Enterprises.

http://www.fuelinjectionenterprises.com/

I think you will find the general feeling is your car will pick up with the mag in it.

Good Luck,

Rapid

 

Another option is to use the MSD 10 Plus unit. When you start comparing apples to apples (energy at the plug)the only unit that puts out more Millijoules to the plug is the MSD Pro Mag 44. The Pro Mag 44 puts out 950 MJ's, your MSD 3 puts out 160 MJ's and the MSD 10 Plus puts out 700 MJ's.

When comparing the 10 Plus to the Mag 12 it's 300 MJ's and I think (not 100% sure) the Mag 20 puts out 500 MJ's.

I think the MSD 10 Plus is really being over looked.
Blessings........Ron Clevenger.

 

Mag vs ?

We use to run a Super Mag 4 then swapped to a MSD 20. The guys at MSD recommend we run a MSD 12 or 20 not a 44 on the chevy. So we put on a 20 and picked up tenth from the Super 4. The guys at MSD did not prefer MSD 10 over the 12 or 20. Hope this helps a little bit.

 

I'm always skeptical when I get a comment or preference like this from a manufacturer, especially when you can compare the techincal data of the products. I think it can certainly depend on who your talking to and what role marketing if any is playing influence. You really see this when talking to a cam company.
Not posing any argument, just trying to arrive at the logical conclusion. If the bottom line of measuring energy delivered to the spark plug is the millijoules, why would that not be the determining factor in choosing an ignition?

I do know that when talking to MSD in regards to the 7531, the only one that gives knowledgable answers is Joe. The others will lead you all over the place.
That's my thought's anyway.........blessings........Ron Clevenger.

 

I have had good service from Joe as well.

EDB

 

thanks guys for the info will proably look into the msd 10 plus.

 

Ron, IMO, the bottom line is not always delivery of more average spark energy. From my years as a Mallory engineer designing generators, it is a much more complicated solution than simply applying more advertised power to a combustion engine. I will not digress into all of the details of what makes combustion effiecient in all motors but here is some food for thought.

Most racers don't have the equipment or budget to perform multiple emperical tests on various ignition systems as it is applied to multiple engine parameters. What I found was that modern ignition design is still a long ways away from producing maximum power from the BTU's within the fuel. Here are a list of a few things which should determine the proper ignition system.

fuel type, fuel load, timing, rpm, BREAKOVER CURRENT, dynamic compression, chamber design, combustion volume, R/S ratios, whether the fuel streams over the plug when the intake opens (or not), matchup between inductive loads in the coil and generator, vibration, TIMING STABILITY, resistance, impedance, spark plug design, temperature, plug placement, dual vs. single plug, magneto polarity, magneto radial distance, spark sustainment (duration)etc.

I didn't want to make it seem like you need a formula 1 engineering team to figure out what is the optimal configuration for your engine, just wanted to illustrate that there is a bit more than you may think when it comes to selecting the proper ignition.

So in summary, I would say it is reasonable to ask knowledgeable people like Joe Panda what the best "canned" ignition system would be for your application.

Cheers....Bill

 

We switched from a Mallory 4 to the MSD 10 plus last year. The 10 is great. I had to add about 25 to the main to compensate for the hotter spark. Also the programmable timing box is a great asset as far as a timing curve. The price difference and ability to start the engine with 2 twelve volt batteries was a consideration when we decided on th 10 over a promag. 69outlaw

 

Thought

I would agree on adding fuel when you stepped up to the 10 considering you where running a 4. I agee with the previous thread it all depends on your actual application. Either or you could still start your motor with 2 twelve volt batteries regardless. I talk to a man last night about the MSD 10 he said he had good luck with the 10 but swapped over to the MSD 44 when he went to the PSI-D. Once agian it goes to prove it is about your application.