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Old 11-03-2005, 08:14 PM   #1
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1984 28' Funeral Coach
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MSD vs. Jacobs??

O.K. I've been reading some old posts... you guys really need to get a life...me too.
I'm wondering if you could all chime in on the various merits of each ignition change you've done.
I'm leaning toward the MSD HEI but not sure I need to go all the way to variable timing.
I'm not familiar with Jacobs so educate me you Jacobs fans.
As I'm a daily driver I'm doing all I can to burn all of this liquid gold I pump every day!!
I'm thrilled to be able to clock 9.53 MPG without running the genset or a/c but am still looking for more.
The old bus was getting 6-7.5 and I drove it 56,000 miles in 22 months before switching over last month to the new AS... do the math and you'll see that I'm a part owner in OPEC.
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Old 11-03-2005, 09:02 PM   #2
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Glenn, you already have an HEI system on your coach, are you sure you want to change? I am not sure, but I think your engine has some limited computer controls, such as spark advance, also. It may be better to get a reman distributor in-kind, than an expensive changover.
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Old 11-03-2005, 09:14 PM   #3
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Not sure about that one Terry, vacum advance... I'm looking for hotter, longer or multiple spark, max burn...
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Old 11-03-2005, 09:20 PM   #4
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Quote:
Originally Posted by GlenCoombe
Not sure about that one Terry, vacum advance... I'm looking for hotter, longer or multiple spark, max burn...
Okay, the mid-80's were transition times for cars and trucks. Almost all cars and pickups had computer controlled stuff, and it worked its way up the size range starting in 1981. I wasn't sure if it had made it to the P30 series by then.
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Old 11-04-2005, 07:56 AM   #5
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Talking

I put the Jacobs Mileage Master system on my '92 Chevy 1500 Z71 and instantly found that the 5.7 litre engine started faster and the engine was less prone to quit if I got into the clutch in the lower RPM band. I was getting 21 mpg at 65 mph on the interstate already so the system did not help mileage. Jacobs has good plug wires and the computer that makes up the system senses when you need additional spark such as in the "almost about to choke" condition I mentioned above or if there is a weak plug. It also comes with a "valet" switch which allows the vehicle to run for a few about 10 seconds to be parked then shuts the engine down. If someone were to steal the vehicle, it runs for 10 seconds and quits. Each time you try to start it there is a delay. The thief would leave it.

After the '92 was rolled by my son, we took the system off and transferred it to a '92 Camaro RS. When it was sold, the system went to a '90 Chevy 1500 4X4 Sport. We've had the system since early '95 and are pleased with it's performance over 3 vehicles.
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Old 11-04-2005, 10:47 AM   #6
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PeterH will probably chime in, but I know he put the Jacob's rv energy pack and the ceramic wires on his 79 and was very pleased with the results in power, and performance.
The rv pack has an uphill sensor that gives you a boost when needed.
I don't recall what exhaust mods (if any) he did.
Read some more old threads...I believe there is alot of discussion on this.
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Old 11-04-2005, 10:53 AM   #7
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I went low tech and just replaced my stock distributor with a reman, new coil, Accel 9000 wires, etc. I'm very happy with it.
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Old 11-05-2005, 04:07 PM   #8
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My Accel hi heat wires have held up very well, except for the one above my slight exhaust leak. I wrapped it in aluminum heat tape until I can replace the manifolds altogether. Maybe next Spring.
Meanwhile all is well. Sure has been fun to drive the AS with the air bags up making the ride so smooth. What a difference.
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