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Wed Apr 06, 2016 7:54 am

I have a Omni-Magnum, which I purchased new around 1997..... ran it in a 93 Chevy Caprice, 5.7 old Highway Patrol Cruiser. When I sold the cruiser, pulled my Omni .... has sat on the shelf ever since
here is page one of my instruction sheet

Wed May 03, 2017 7:31 am

Scott Novak wrote: The Mileage Master is an inductive switcher. As such is is very dependent upon your system voltage. More so than most of the capacitive discharge ignition systems. I think Fred Winterburn could tell you more about the spark power differences between the two as well as the system voltage dependancy.

I've had reliability problems with the IcePaks. Otherwise they seem to work nicely.

I've only used a Pro 10 long enough to test it and make sure it was working okay and I wasn't drag racing with it. But for drag racing I suspect this may work best for you of any of the Jacobs ignition systems. It should give you the hottest spark.

There have been at least 7 different versions of the older cube shaped Ultra Coil. The only underperformer of the bunch was an early one that had a thinner mounting flange with a 1:100 Turns ratio. There is one Ultra Coil version with a 1:60 Turns ratio.

I think that all of the Jacobs coils with push on connectors are the less desirable 1:100 turns ratio.

Also, please note that turns ratios is specified input to output. The ignition coil is a step up autotransformer, so the lowest number should be specified first. Someone in the auto industry ignorantly started specifying this backwards and everyone else followed suit, including Mallory, Accel, MST, etc.

The biggest limiter of your ignition system is going to be the distributor cap. You can't open your spark plug gaps very wide with a stock small Bosch cap.

Scott Novak

Hey Scott, referring to your post on the shoptalkforums website on the Jacobs Boost Timer, you said that the 8 cylinder version can work on a 4 cylinder right?

My concern is that I want to limit my revs @ 8000 rpm but I know you said that on the 8 cylinder model the rev limit has to be set twice the value of what you want if you using it on a 4 cylinder..
But from what I see on the control knob of the Boost timer is that the maximum rpm you can limit to is 10,000 rpm.

So does this mean that on a 4 cylinder, the maximum rpm limit will be 5000 rpm if I were to use it?

http://smg.photobucket.com/user/Hayaboosta/media/tn_DSC02197.jpg.html

Wed May 03, 2017 2:14 pm

If you are using an 8-Cylinder version of the Boost Master with a 4-cylinder engine, you need to set the RPM limit to 1/2 of what is marked on the Boost Master. If I said twice, it was in error and I must have been posting when I should have been sleeping.

Also, the dial calibration of the timing retard will be incorrect.

Scott Novak

Sat Feb 09, 2019 1:58 pm

Scott Novak wrote: If you are using an 8-Cylinder version of the Boost Master with a 4-cylinder engine, you need to set the RPM limit to 1/2 of what is marked on the Boost Master. If I said twice, it was in error and I must have been posting when I should have been sleeping.

Also, the dial calibration of the timing retard will be incorrect.

Scott Novak

Ok cool thanks!!

Scott can you source one for me?