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Discussion Starter #1 (Edited)
My dizzy just took a dump, and not only am I in a hurry, but also broke at the moment.

I have a "Small Cap" HEI distributor with the external coil out of an 87 TPI...

Now, The only issue with this is there's no advance on it. Can I just lock my timing and use this until I can get something else?

Any issues I'd have if I do use this, and lock timing?

EDIT: Oh yeah, its a jet boat with a 496 Stroker...I'd just use an HEI but I have a tunnel ram.
 

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AKA Blownjet 468
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the only thing inside is the pickup- the module is external also- it would work, but I wouldn't do it....what went wrong with your other distributor?
 

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At least with the HEI, you can put in a curve kit and quicken it up. Use the lightest springs with the weights that comes with kit.
 

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Discussion Starter #5
The module in the dizzy just went bad....

I've read up on those comp 9000's or whatever they're called...mallory's old breakerless distributors; and thats what they do. Those modules were pretty fragile. It started yesterday, and today...nothin. Coil is good, power to coil, etc etc etc, its the distributor.

getrdone: there are no weights or springs in this style, this was used with the ECM to adjust the timing, so I'd have to just lock her down.
 

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the module in the dizzy just went bad....

I've read up on those comp 9000's or whatever they're called...mallory's old breakerless distributors; and thats what they do. Those modules were pretty fragile. It started yesterday, and today...nothin. Coil is good, power to coil, etc etc etc, its the distributor.
one of the statements we hear from customers when they call us about testing/replacing their unilite® module is that they have read on various web forums that the unilite® is an unreliable pos. We can tell you that the people posting those comments should probably not be working on their vehicles unsupervised. These people are blaming the affect (a blown or damaged module) instead of what actually caused the module to fail.
i regularly use the following analogy when speaking to our customers about module reliability: if you were to purchase four brand new tires and then knowingly drive through a pile of steel and all the tires go flat, would you blame the tires as being junk? The reply that is given 100% of the time is "of course not!". The driver was obviously an idiot. So, why do people find it so easy to blame an ignition module? The easy answer is lack of understanding of the product. It is easy to blame something that you know nothing about.​
the modules cannot really kill themselves, so you have to try to find out what caused the failure. We have customers that have used the same module for 20+ years and others that have killed three on a saturday afternoon. The guy that killed three purchased two rebuilt alternators from a typical chain store and both had cheap (cost savings), sticking diodes in them, causing a voltage dump to ground. I endured considerable screaming, cussing, and insults, yet i finally got him to agree to take the alternator(s) to a local rebuilder on monday for testing. note: The basic bench testers in the parts stores cannot test for sticking diodes or a voltage dump. A fast oscilloscope is required. He found out after the units were tested that they were sending a 140+ amp spike to ground every time he turned off the key. This explained why the engine would start once with the new module, but never again. Replacing the diode in the "new" alternator solved the problem.​
Century Performance Center, Inc. :: Mallory Unilite and E-Spark Testing
 

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Bet you never had a unilite fail due to under the hood heat have you. :)sphss

When they first came out they would fail just from the heat coming up thru the dizzy body. Mallory's solution then was to mount the module on silicone to help block the heat. After 3, I just gave up. Fords front mounted dizzy was death to them. Specially a big engine in a small engine compartment. Like a FE powered early Mustang. Heat off the radiator would just toast them. Sure hope they have improved.



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If you are limited on space, but want a true HEI - there is this problem solver. It's their "tri-power HEI", since 3-2 manifolds usually take up a bunch of distributor space.

14720-2.jpg

Performance Distributors now offers a small diameter high performance electronic
ignition system for Chevrolet engines that do not have the clearance for a D.U.I.
Due to the large size of the DUI, it will not fit applications utilizing a blower, tunnel
ram or where the engine is too close to the firewall. This put our engineers to work
using a smaller diameter distributor. The results were the new Tri-Power Ignition
System. The Tri-Power ignition system features our Dyna Mod (HEI style module)
mounted externally to a remanufactured Chevrolet points style distributor housing.
The system also includes our high voltage "Inferno" coil which is mounted externally
from the distributor. The Inferno coil allows spark plug gaps to be opened to an
incredible .055". Each Tri-Power distributor is custom tuned on a distributor machine
based on your cam duration & lift, compression ratio, octane of fuel and vehicle
weight. A super smooth advance curve will eliminate engine damaging detonation,
provide instant throttle response and produce maximum power throughout your entire
rpm range. With the combination of the Inferno coil and Dyna Mod module, you will
notice quicker starting, smoother idle and more horsepower up to 8500 rpms!. The
new Tri-Power ignition system is also available for other GM applications.
 

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20 YRS AND COUNTINGhil:)hil:)Reality So 1990ish :)sphss I think I remember posting when they FIRST came out. Try like more than 30 yrs ago. I guess maybe they should have put a warning on the box, "NOT SUITABLE FOR FORD JUNK":)sphss They didn't, and lost a life long customer that was 100% Mallory then. I don't think I was alone either. I think the sales support that.
They were on top for years, let their customers down big time, probably as a result of being sold to Joe Hrudka, who could screw up a wet dream by doing nothing more than waking up.
Amazing how fast he was able to almost destroy Mallory and Accel which were both very popular, Erson cams, another perfered choice at the time, Hays, one of the largest sellers in clutches. Now Prestolite has them, and they are so far in the toilet, they can only manage to keep the doors open with shear cash.

Such a pity. All top companies. And all he had to do was be square with the cash paying customers that built the companies to start with.
MSD seems to be going the same way. Fall behind in technology, and crappy customer service will kill a company every time. Who knows, it could happen to them if they forget the customer and concentrate chasing the almighty dollar.

Hope all this cash grapping doesn't lead us to all run Chinese made ignitions. Or are we already:)eh:)



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GN'z right- back in the days of "SuperShops" mallory was king:p I had a friend who was
a manager of one of the stores in Pomona, where every visit got me the 50 dollar deal
on anything in the store. all my friends therefore ran Mallory dist.,Erson cams, etc..
was told to run the active power filter on them-never had a problem. just never wanted
one in a boat-would rather use their magnetic breakerless module- you can still get the
conversion for yours to do this, and not have to worry about the "supermarket door buzzer"
module failing on the water;):p their new stuff is also just as nice as the Msd stuff,
prob. better- but not sure, I have boxes of 6al's, so that's what I'm gonna use till they
crap- BUT MY NEXT ONE WILL BE "ICE" for sure:D
 

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Delco Voyager

Delco actually markets the small cap external coil HEI as a marine ignition called Voyager. They came on lots of SBC engines for jet drives up here. While there is no mechanical advance, there is a "limp-home" curve built into the module (about 20* IIRC). I've run lots of them without any issues whatsoever.
 

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I have a "Small Cap" HEI distributor with the external coil out of an 87 TPI...

Now, The only issue with this is there's no advance on it.
You can use that set-up on a carbureted application. The module does have an advance curve in it.

I have used it that way a few times. Off the top of my head it only has a 16-18 advance and it's all in by like 2600-2800 degrees which works well for most medium performance builds.
 

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AND WHERE IS THIS ALL GOING? :)coffee
Where? Here! Like Muska and CFM said, stick the small cap HEI in it and never look back! Locked timing and all.
Put the Mallory on E bay starting at 10.00 as is and see how far up it goes.

If you fail a module in that, you can get one in any auto parts store for a hell of a lot less than 40.

You can buy a Davis Unified Dyna Module for a about 50.00, and only if the engine spins higher than 5500. Keep the stocker in the boat as back up spare. The HEI mod can fail, but not nearly as easily as a Unilite. GM pretty much knew dumbass car owners would try to start or drive there cars with low batteries and somewhat safe guard the module. And the HEI module thrives on voltage. The unilite DOES NOT!. In fact, the earliest Unlites required a ballast resister just like a points/condenser. POS!
Don't know if they still do. Haven't looked at the stuff for over 30 yrs and don't plan on looking to them out any time soon.

Mallory sells a power filter to prevent unilite failures from voltage spikes, for an addional 40 some dollars. Why this isn't part of the dizzy, knowing full well the Unilite is so sensitive to voltage, is beyond my thinking. Guess maybe because it sells alot of modules. Doesn't go far in selling alot if dizzys though:)sphss


Mallory has two unilite modules, the 6000M for about 80.00 and the 605 for about 40.00. So I don't know if I would go so far as to call Sold Honda's post "internet misimformation. Far from it!
Maybe CNCSpark can tell us all why that is. Maybe the 80.00 is for Fords:)sphss
I sure don't call 80.00 internet misinformation though:)hand



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Power addict, You do not need the advance in a jet application. Low motor load till well after your advance should be all in anyhow. Just extra parts spinning you have no real use for. You are not trying to accelerate a heavy auto. Save your self some future fustration and ditch the advance.
 

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Mallory has two unilite modules, the 6000M for about 80.00 and the 605 for about 40.00. So I don't know if I would go so far as to call Sold Honda's post "internet misimformation. Far from it!
Maybe CNCSpark can tell us all why that is. Maybe the 80.00 is for Fords:)sphss
I sure don't call 80.00 internet misinformation though:)hand
Oh, this is getting good! Misinformation. The 6100M is the correct replacement for the 605 according to Summit and Century Performance and it is the $40 module. Look, there are lots of great ignitions systems out there, pick your fav and go for it! Lets try to leave your bias and pre-conceived notions at the door and see if we can help the OP with an ignition problem :)devil
 
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