I just figured I'd relate my experience so far with Jacobs' Omni Magnum, since there seems to be a definite lack of info about Jacobs stuff - at least that's what I found while trying to research it!
I purchased and installed the Omni Magnum (dual coils - one low RPM, the other high RPM biased - and ignition module in a single package) on my '77 F-150 running a stock 390, and it immediately made a difference. There is _zero_ throttle hesitation, even when the engine's cold, and throttle response overall is much snappier. I can definitely feel the difference in the seat of my pants - she's just quicker, and much smoother than before. Jacobs also claims increased fuel economy (always a boon when running a big block!), but I haven't had it installed long enough to prove that out...
Installation is almost laughably simple - it took longer to mount the unit and make the wiring look neat than to actually connect it. With Jacobs' EZ Connect kit, you simply hook up the stock coil output to the Jacobs trigger (which is already wired to the Magnum itself), and run a high-tension lead from the Magnum to the center terminal on the distributor, run power to the Magnum, slap the fuse in and you're done. Jacobs does say that to obtain the full benefits of the Magnum you should regap your plugs to 0.055" (which I actually haven't done yet - I figured I'd try it out with the stock gap (0.044") first)... It's also fully waterproof, although their instructions recommend avoiding submerging it completely...
I haven't seen any direct comparisons to MSD stuff, but the Magnum worked out to be significantly cheaper than a comparable MSD ignition module (6AL, if my memory serves correctly) and off-road coil (epoxy-filled).. Hrm. Not much else to tell ya, except that I'm a fully satisfied customer so far...
I purchased and installed the Omni Magnum (dual coils - one low RPM, the other high RPM biased - and ignition module in a single package) on my '77 F-150 running a stock 390, and it immediately made a difference. There is _zero_ throttle hesitation, even when the engine's cold, and throttle response overall is much snappier. I can definitely feel the difference in the seat of my pants - she's just quicker, and much smoother than before. Jacobs also claims increased fuel economy (always a boon when running a big block!), but I haven't had it installed long enough to prove that out...
Installation is almost laughably simple - it took longer to mount the unit and make the wiring look neat than to actually connect it. With Jacobs' EZ Connect kit, you simply hook up the stock coil output to the Jacobs trigger (which is already wired to the Magnum itself), and run a high-tension lead from the Magnum to the center terminal on the distributor, run power to the Magnum, slap the fuse in and you're done. Jacobs does say that to obtain the full benefits of the Magnum you should regap your plugs to 0.055" (which I actually haven't done yet - I figured I'd try it out with the stock gap (0.044") first)... It's also fully waterproof, although their instructions recommend avoiding submerging it completely...
I haven't seen any direct comparisons to MSD stuff, but the Magnum worked out to be significantly cheaper than a comparable MSD ignition module (6AL, if my memory serves correctly) and off-road coil (epoxy-filled).. Hrm. Not much else to tell ya, except that I'm a fully satisfied customer so far...