: DUI and MSD
12-17-2004, 08:42 PM
I was reading a Car Craft and saw a blurb about a DUI ignition on the last page. I was wondering how much better that is than my HEI? It said the coil, cap, and rotor kit for an HEI was $75. And what's this MSD module type thing I always see mounted on the inner fenders on drag cars and hot rods. Does it give multiple spark? How much is one of those and is it worth it? I have a supercharged 350 that is mild otherwise, but still makes a ton of power. Thanks guys!
12-17-2004, 09:02 PM
That's what MSD stands for Multiple Spark Discharge. You can get the box or since you have HEI you can get a MSD kit that fits completely inside the HEI distributor.
12-17-2004, 11:00 PM
an MSD ignition will improve horsepower and fuel economy. The result of the increase in spark will better burn the fuel in the cylinder thus producing horsepower and efficency. I just sold my MSD 6AL ignition on ebay for $160, I wish I new you might have been interested in it. I have MSD wires, billet distributor, coil, timing control box, and Digital 6 ignition components and they work awesome! -Matt
12-21-2004, 07:30 PM
So is the MSD 6AL a module I can mount and the DUI is the whole distributer set-up? Can I use them together to get a nice advance curve AND have multiple spark? How do I know what part # 6AL to get or are they all the same? I wouldn't really see a big boost in power from this, but it would be quicker starting, burn more of the fuel (that might add some power), have a better advance curve for higher rpm, etc... Is it worth it? I have an HEI ignition and I can get a kit from DUI for $75. The MSD 6AL is what I think will cost the money. How much better would it be to have both working together if I can do that?
12-21-2004, 07:35 PM
I just eliminated the entire HEI ignition because they are outdated. I used a MSD 6AL, with a new MSD Billet Distributor, and MSD coil. This way you can adjust the advance curve with springs and spacers. It was noticable increase in power and gas mileage. It is not the cheapest way, but certainly the best way. They do however make a plug adapter so you can use the MSD 6AL box with your factory HEI distributor. They also make upgrades for the HEI like external coils and better modules. -matt
12-21-2004, 07:57 PM
I think the whole DUI system IS the updated stuff for HEI ignitions. But all this really doesn't matter until I fix my brakes!!! :-( I'm gonna try to bleed them to death tomorrow and see if there isn't an air pocket farther up in the tubes. :?
12-21-2004, 08:15 PM
What prop. valve do you have in it? It may not allow enough pressure to work the rear calipers.
12-22-2004, 06:18 AM
I have none right now because El Caminos only had 1 line to the front and 1 to the rear without a prop. valve stock. Disk brakes require less pressure than drums I think so with out a prop. valve it should deffinatly move if not grab too hard (that's why you'd need a prop. valve) so when I get home from school I'll bleed it again and if that doesn't work I'll take it somewhere (I'm not paying by the hour though! :lol: )
12-23-2004, 03:12 PM
Back to the ignition. The DUI is a HEI on steroids but both are inductive ignitions. MSD 6A, Mallory Hyfire IVA and others are capacitive discharge ignition systems with mutiple-spark capabilities; these systems are better suited to high performance use. The HEI distributor if it is in good condition is an excellent high performance distributor especially since the cap has widely spaced spark towers which cut down on spark crossfiring. I use the HEI distributor with a good multi-spark ignition box; no module in the distributor so the HEI is just used to trigger the box, distribute the spark and provide the mechanical and/or vacumn curve. Works great
12-30-2004, 10:00 PM
Just a quick note about bleeding your brakes Supercharged - if you can, let them gravity bleed. Open the cap on the master, open your bleeders until it's only fluid flowing out. Make sure your master stays full.
12-30-2004, 10:12 PM
There are short rubber hoses leading to the calipers from the metal lines on the rear. The other day a friend and I got them to clamp a little and now we think they might be the problem. When I turn the car on, I have no pedal feel at all though! 8O
01-08-2005, 10:32 AM
I think my friend's vacuum bleeder helped a lot, but the axles are out until the Mosers come so we'll see then.
What I really want to know is if members of this site get discounts on DUI ignitions? In the last 2 days I've seen their ad at the top of the page.
01-11-2005, 10:38 AM
Here is what the MSD Kit I installed in the 76 looks like and I love it. I had to rebuild the HEI Dist, it was pretty much worn out. New bushings, springs sleeve ect...
That Red Box takes the place of the Electronic Module under the cap.
02-16-2005, 10:30 PM
ElkyPete has it right. This is a great setup. It is almost a must to have a multiple spark when running a blower. You are forcing more air & fuel into the combustion chamber, this will ensure a complete burn.
02-20-2005, 06:37 PM
I run a MSD box on everthing I own. You can't beat them.
02-20-2005, 07:21 PM
I run an MSD pro billet hei with the 6a box and it works awesome I just locked out my distributor to 34 degrees advance full time and man what a big difference in performance,snappier throttle response,motor runs alot cooler and smoother idle,and less moving parts to worry about.The only down side is fuel economy fail of by about 2-4 mpg and if you dont have a hi torque starter the motor will be harder to kick over when warm.