Jacobs ignition system

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Jacobs ignition system

Home > Discussion Forum > Mechanic's Corner - Electrical

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All Messages in Thread	Author	Date
Jacobs ignition system	Brian Sherman	10-7-03
About three years ago I bought a Jacobs Pro-Street ignition sys. for my 31ft. Chevy powered class A. Sale was made by phone, direct from Jacobs, on the advice of a technician. The increase in power was noticable, and the engine runs cool, even climbing the mountains in N.C. BUT, after 9 or 10 thousand miles, the spark plug boots were arcing thru when accelerating hard from a standstill. Jacobs no longer retails, seldom answers the phone ("all techs. are busy, leave your phone no. and company name") and completely ignores e-mails. If they knew a 454 with stock iron manifolds would barbeque the boots, why didn't they supply ceramic boots, extra cost or not? My conclusion: great product -- abominable support. bbs
Jacobs Off-Road Ignition - Uphill Module	Nick	3-4-04
I am trying to install the Uphill module on the Off-road ignition pack. The online instructions aren't compatible w/ my system. Instructions say to connect the UPM red and black wires to the red and black full-throttle wires on the computer. On my Off-road Ignition Pack, I have 3 sets of wires coming out of the computer. 1. Red and Black - go to the battery 2. Green - goes to the secondary trigger 3. White and Black - go to the Ultra Coil. Can anyone tell me how to connect the UPM. Thanks, Nick
Re: Jacobs ignition system	mike	10-15-03
Don't forget that if you battery falls below 9.6 volts the the Jacobs system will not funtion. I sent mine back to the factory and had it tested. It tested within specs and still failed to fire. I took it off and replaced the stock parts. It's now is in my spare parts box.
Re: Jacobs ignition system	Russel	10-7-03
Part of the reason your boots are breaking down is the high/extreme KV that is possible with this/these high dollar and pretty blue ignition systems. Why do you need a system that is capable of 45 to 60 KV when your spark plugs only need,maybe 8 - 12 KV to fire? Well, what happens is that the wires and boots break down because they can not isolate the high KV when they start to age. Aside from the fact that you must have the steel heat shields on the spark plugs on a 454 or even the ceramic boots fail with stock ignition. I have taken a lot of these hot dog systems off over the years and put back stock systems with the shields to stop just what has happened to you. The only true test of whether these systems are worth anything is to do a drag race before(time-distance) and one after installation. I never trust "noticeable" improvement. And, have never recorded a difference to justify these. Engines are air pumps. Get the air in, squeeze it, and get rid of it. THAT is where you can increase performance. And, those intake tornado things are a waste of money to.
Re: Jacobs ignition system	Sam Watson	10-9-03
That's the truth, a stock system that puts out 28-30 KV open circuit voltage is entirely adequate for the job. Once ignition takes place, the ignition system has done it's job and doesn't enter into flame front propagation, etc.
Re: Jacobs ignition system	Chuck P30	10-8-03
Russel. You forgot a few very important steps on making power, you said “Get the air in, squeeze it, and get rid of it." You forgot what the topic was in fact talking about and that is to LITE it, Do you think 12KV will light at say 10-1 and fully warmed up? and under load, and then jump say a wide gap of.35 or with some wear and maybe an aggressive tuner, a GAP of say.50 or more, I think not... I know you arte more right then wrong BUT a GOOD Ign. system, is ALWAYS worth it... Weather it is JAB, MSD or Crane.... They all offer the same MUTI SPARK Discharge.. and create a better flame front propagation. With respect, Chuck
Re: Jacobs Off-Road Ignition - Uphill Module	brad hill	4-3-04
Have a 1974 to 1980 chev HEI ignition will this worck. ?