High Energy Ignition Systems Jacobs MSD Mallory
- vw505
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Re: High Energy Ignition Systems Jacobs MSD Mallory
I looked for that wireing info for two days so i could hook up my tach.
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Re: High Energy Ignition Systems Jacobs MSD Mallory
Scott, I found this system online and it does NOT have the rev limiter or anti-theft functions. Is this still a good one to use on a H.P. street VW? It does have the twisted orange & purple wires. Thanks, Mike
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Re: High Energy Ignition Systems Jacobs MSD Mallory
I missed one of other pictures for the unit.
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Re: High Energy Ignition Systems Jacobs MSD Mallory
Yes it is a great ignition system to use for stock, street or race conditions.
I'm 99.8% sure that this does in fact have both a rev limiter and anti-theft functions. You need to look at the terminal strip underneath the Pro Street.
That looks like it's NOS in the photos.
Also be sure that you are using a NON-resistor rotor, as this ignition system has enough energy to fry a resistor rotor.
Scott Novak
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Re: High Energy Ignition Systems Jacobs MSD Mallory
Thank you so much for the reply! The backside of the box does NOT have the rev limiter & anti theft checked off? I will have to check it out as you said. Thanks again, Mike
- Jadewombat
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Re: High Energy Ignition Systems Jacobs MSD Mallory
Why use a system like this? You're still stuck with sloppy timing scatter instead of using crank-trigger.
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Re: High Energy Ignition Systems Jacobs MSD Mallory
The Jacobs ignition system can also be used with a crank trigger. It doesn't care where it gets it's trigger signal from. And you won't find too many systems that will produce a better spark.Jadewombat wrote: ↑Thu Oct 03, 2019 6:17 pm Why use a system like this? You're still stuck with sloppy timing scatter instead of using crank-trigger.
Scott Novak
- Piledriver
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Re: High Energy Ignition Systems Jacobs MSD Mallory
I have a lame RV/street relative of this Jacobs system, and it hit almost as hard as a GM truck cnp coil setup.*
If you want the old school look of a distributor, these systems kick about as good as it gets.
Sadly getting rid of the HV parts of a distributor is the biggest advantage of modern ignition systems.
*I retired it and the early vanagon distributor when I went full sequential ms2. I still use a distributor, it just only has a toothed whee/sensor in it.
There was no spark stability difference distrib vs. crank trigger as far as I could measure, a lot of averaging goes on in the ignition code with a reasonably high tooth count.
VWs dont have timing chain slop like many v8s... that amplified by oil pump load pulsations makes timing scatter a real issue on those.
If you want the old school look of a distributor, these systems kick about as good as it gets.
Sadly getting rid of the HV parts of a distributor is the biggest advantage of modern ignition systems.
*I retired it and the early vanagon distributor when I went full sequential ms2. I still use a distributor, it just only has a toothed whee/sensor in it.
There was no spark stability difference distrib vs. crank trigger as far as I could measure, a lot of averaging goes on in the ignition code with a reasonably high tooth count.
VWs dont have timing chain slop like many v8s... that amplified by oil pump load pulsations makes timing scatter a real issue on those.
Addendum to Newtons first law:
zero vehicles on jackstands, square gets a fresh 090 and 1911, cabby gets a blower.
EZ3.6 Vanagon after that.(mounted, needs everything finished) then Creamsicle.
zero vehicles on jackstands, square gets a fresh 090 and 1911, cabby gets a blower.
EZ3.6 Vanagon after that.(mounted, needs everything finished) then Creamsicle.
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Re: High Energy Ignition Systems Jacobs MSD Mallory
In my case the distributor is not an issue, as I modified a huge cap Mallory Comp 9000 Vacuum Advance distributor to fit my Beetle. It can handle anything that a Jacobs ignition can throw at it, at least for 4 - Cylinder applications. It's also rated for 10,000 RPM applications.Piledriver wrote: ↑Fri Oct 04, 2019 12:25 amSadly getting rid of the HV parts of a distributor is the biggest advantage of modern ignition systems.
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Here is a size comparison between a small Bosch distributor cap, a Mallory Comp 9000, and a Mallory small distributor cap.
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Scott Novak
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- Piledriver
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Re: High Energy Ignition Systems Jacobs MSD Mallory
Inspired by your setup, a few years ago I modded a std unilite vw distributor to that cap size using 460 ford cap/rotor and cap base.
Cut down the mallory cap as the adapter, and made a simple rotor adapter.
Worked great.
Cut down the mallory cap as the adapter, and made a simple rotor adapter.
Worked great.
Addendum to Newtons first law:
zero vehicles on jackstands, square gets a fresh 090 and 1911, cabby gets a blower.
EZ3.6 Vanagon after that.(mounted, needs everything finished) then Creamsicle.
zero vehicles on jackstands, square gets a fresh 090 and 1911, cabby gets a blower.
EZ3.6 Vanagon after that.(mounted, needs everything finished) then Creamsicle.