MSD ignition LEts see some

I don't have pics, but:

MSD stands for Multiple Spark Discharge. As the name says, they allow multiple sparks to ensure that the compressed fuel/air mixture in the chamber fully ignites. It is also a hotter spark and the plugs can be gapped further providing a larger spark as well. In some cases, this can increase horsepower since it increases efficiency, but some debate this. In a two-stroke engine, there is no doubt that they help enormously. They are also bombproof. Running an MSD ignition can increase RF noise which can be heard through your audio and in some cases disrupt computer function among other electronic things. So its also a very good idea to get the best plugs and plug wires you can find. 8.5mm plug wires and some kind of split-fire or other high-tech plug.

I don't have one on my Jeep, but I've had them on other vehicles. I like the simplicity and reliability of them. I've never really noticed any performance enhancements with them, except on a two-stroke engine. It really boosted the HP...

HTH
 
So, if I were to do a msd set up, it wouldn't smooth out the rpms and give the jeep a rougher sounding idle, or more growl or something. Just wondering, my friend had put an msd on his datsun truck a long time ago and that thing sounded beasty when he was done with it. Had some sorta rev limiter thing on it to?
arghh
 
dzolcali said:
So, if I were to do a msd set up, it wouldn't smooth out the rpms and give the jeep a rougher sounding idle, or more growl or something. Just wondering, my friend had put an msd on his datsun truck a long time ago and that thing sounded beasty when he was done with it. Had some sorta rev limiter thing on it to?
arghh
Click to expand...
I've never noticed a change like that with the MSD mod. Are you sure he didn't also put on a free flow exhaust and open intake? Those would account for the growl. The rougher sounding idle could just be advanced timing...

Others may have different thoughts...
 
I wouldn't put one on a stock 4.0.
Hell, I wouldn't put one on a souped up 4.0, for that matter.
You'd be money ahead with just a hotter coil and a Tornado.
 
dzolcali said:
whats a tornado?
Click to expand...
tornadotv.gif



Seriously, not really.
:roflmao:
 
Ok umm I don't want that gimmick in my jeep. I want a way to like fine tune my engine so it sounds beefy, I got a flow master on it now....but I want even more growl but a smooth tone you know. Nvm just thought the msd would help
 
OT said:
I wouldn't put one on a stock 4.0.
Hell, I wouldn't put one on a souped up 4.0, for that matter.
You'd be money ahead with just a hotter coil and a Tornado.
Click to expand...


Any suggestions on a" hotter coil"? I'm running a bit rich in my 91and have been thinking about an ignition upgrade of some sort, but don't know what I want, yet. I like the Rusty's intake kit--the price is reasonable. thanks.
 
Find the reason for the rich condition and fix it...the stock ignition is fine. I have run MSD on competition engines for years....they really help keep the fires burning in carbed motors with lots of cam duration, overlap and serious compression where the idle tends to be really rich...in the old days, stock ignitions were lacking somewhat in fire power...your ignition is fine on a stock motor unless there is something wrong with some ignition component....and stay away from "trick" spark plugs...they are a waste of $$ and may decrease your performance...

If you have use for a 2 step or a rev limiter...MSD is a good way to go..
 
Would an MSD get rid of the 5k rpm limit??

And which MSD coil/hotter coil should be put in?

I have a spare MSD 6al and thought about installing it also. Reading this, I may hold on to it instead.
 
It won't override the inherent rev limiter unless you changed to a stand alone ignition...then your efi won't work...unless there is a patch for that.
You can call MSD about it..they have excellent tech assistance.
 
MudDawg said:
then your efi won't work...unless there is a patch for that.
Click to expand...

Thats easy, just set your IRQ to 62, make sure you are set up to recieve inbound host connections then flash the bios.
 
I emailed MSD about a week ago and haven't heard back on which coil to use.

StreetPirate...HUH?

Anywho, I had a spare MSD-6AL in the barn and was thinking of using it to get more/better spark. Wondered if it would screw up anything else. Also wondered if I could use a 6k chip in it like I have on my carbed V8.

Guess a hotter coil is all I can do without any major hassle.
 
Bouncy said:
I emailed MSD about a week ago and haven't heard back on which coil to use.

StreetPirate...HUH?

Anywho, I had a spare MSD-6AL in the barn and was thinking of using it to get more/better spark. Wondered if it would screw up anything else. Also wondered if I could use a 6k chip in it like I have on my carbed V8.

Guess a hotter coil is all I can do without any major hassle.
Click to expand...


WHY.... 4.0 makes peak power WAY before the 5250 rev limiter. and valves float around 5300-5400
 
tealcherokee said:
WHY.... 4.0 makes peak power WAY before the 5250 rev limiter. and valves float around 5300-5400
Click to expand...

Not sure if I am going overboard but...

4.7 stroker
Heavy valve springs
Better cam
Fully ported and polished head
Balanced assembly

May...Or at least should hit 6k rpm without to many problems.

I agree with you on the other info...But I am building this motor to run a little better than stock :D
 
those look like nice plug wires...I already bought a rotor switch and distributor cap, whcih I have installed....I'm wondering, if I were to get msd 8.5mm wires would it help make things run smoother like that kit is claiming? Also i'm running performance truck plugs...can't remember who makes them but they are recommended by a few people on the boards. I have noticed significant improvement in rpm idle and rev after installing a new distributor cap alone.


off subject, how much are people paying to get qaulity window tinting jobs around here...I'm about to drop 250 for 15% on all the backs, and 45% on the front two does that sound reasonable.
 
Pop a 8k chip in it like i have on the mighty 2.5 mod-2.2
 
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