What Jacobs ignition are you wanting? I have several in a barrel here that people have just left here.
They have a tendency to throw them out when I bench test them next to an MSD ignition.
Comparing designs, Jacobs is in the Iron Age compared to MSD that is in the Space age.... (space shuttle space age, not Mars landing space age)
MSD uses proven technology that durable, and time tested.
Jacobs uses mostly designs I'd call 'Vintage'... and 'Questionable' technology...
MSD has better prices on better products.
MSD is in the winners circle in EVERY type of racing, Jacobs is not.
If Jacobs had anything going for it, BELIEVE ME, every NASCAR TEAM/ IHRA/ NHRA/ SCCA ect. ect., teams would be using them.
MSD is on top, and MSD is king for one simple reason, they build an ignition that works exactly as advertised. They even post specs in their catalogs.
I've never once seen an MSD product come in under specifications, and I do a LOT of ignition work...
Sadly, I can't say that for ANY other ignition manufacturer, even the factory units.
MSD 6 series is the most reasonably priced ignition module. ($130 to $300 depending on model)
It is Capacitive Discharge Ignition (CDI), meaning it has almost zero coil saturation time.
(coil saturation time, the time it takes the ignition coil to charge for a much 'hotter' spark. VERY important.)
The MSD 6 series modules and up are Multiple Discharge Ignition (MSD), Meaning the plugs fires several times,
DURATION of the spark is much longer. Around 1,000% increase over Inductive ignitions.
(Duration, The time the spark is actually hanging in you combustion chamber to light the fuel mixture. VERY important.)
AMPERAGE is increased with the increased coil saturation.
AMPERAGE is what makes that thick rich blue spark that gets things going.
MSD modules can produce some truly impressive amperage figures.
400% to 1,000% increases in amperage.
Now, something any normal consumer should concern them selves with...
Jacobs will charge you for just looking at your ignition should anything go wrong.
Jacobs has an 'Integrated' system, meaning they won't warranty it if you don't use everything from them. Coil, wires, everything.
MSD will show the gains mentioned with STOCK PARTS... The module is all you buy!!
They have FREE customer service!
They have FREE tech lines!
They have GREAT instructions that are FREE!
I only know two people that paid for any kind of repairs in over 20 years of using MSD.
(Both of them were a pain in the butt! Kept hooking up things backwards and burning up boxes)
I send in 10 and 15 year old modules all the time, updated to modern designs, thoroughly checked, burned in, and sent back, free of charge.
I have never once been charged anything but shipping to MSD (by UPS) for any return in over 20 years of doing business with MSD.
MSD 6 modules are also 50 state emissions legal! Try that with most other ignitions!
Works with stock parts, on stock automobiles...
Adaptors made so you don't have to butcher your stock wiring harness.
Improves milage and performance.
Improves cold start and idle.
Very reasonable pricing.
Great customer service.
Free tech line.
Free catalog. ( http://www.msdignition.com
Free wiring diagrams.
HUGE support equipment if you decide to upgrade later.
Dominates the winners circle in every type of racing.
50 state emissions legal.
Very reliable, over 30 years on the market.
If it fails, free repair with free upgrade to the latest parts.
Less than two week turnaround on the repair modules, (Most of that UPS time)
I'm not going to beat on them. Employees at Jacobs have to eat too.
"I Have The Body Of A God... Buddha"