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HEI dizzy upgrade

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78K-5BLAZER

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Ok a bit of a back story a few weeks ago I went to start my blazer and it would just crank. After some tests I had figured out I had lost spark. I do not know how it happened but one of the wires came out of the plug spade terminal. So I had fixed it and it would still not fire. So I got online and done some reading and ended up ordering a new module rotor and cap with a 65K coil. I hope this will fix it and I do not have to buy a pickup coil. I am a bit confused about the module because from what I understand the module can get hot and thermal/heat sink compound is a must what kind should I use. I was watching a video for an upgrade kit and it said to use silicon compound to hep the the module conduct better. So do I use both or one.
thanks
 
Would it be worth while to upgrade to 10.4mm plug wires. would there be a difference in power or more complete burn. I think it would help take better advantage of the 65,000kv coil which to me is much better then the factory rated 35,000kv coil.
thanks
 
I think the build quality of the wire is more important than the diameter. Resistance means *something* (ohms/foot) but every wire has a lot less resistance than the spark gap with a big charge in the hole. IMHO the durability of the wire is more important than the "out of the box" initial performance.

Also, coil voltage is a bit of a ratings question instead of a clear indicator of "goodness". Under what conditions do they get that voltage? With a stock module or one with increased dwell? What is the voltage under peak load at your max rpm? Who knows. I wish they would give them a standard rating based on joules of energy for a given dwell. It's possible for a coil with a higher turns ratio to perform worse than a stock one with the same drive. The ignition has to be considered as a complete system.

Is your compression higher than stock? Are you spinning above 5000RPM? If not, you probably don't need fancy wires.
 
Blue85 said:
I think the build quality of the wire is more important than the diameter. Resistance means *something* (ohms/foot) but every wire has a lot less resistance than the spark gap with a big charge in the hole. IMHO the durability of the wire is more important than the "out of the box" initial performance.

Also, coil voltage is a bit of a ratings question instead of a clear indicator of "goodness". Under what conditions do they get that voltage? With a stock module or one with increased dwell? What is the voltage under peak load at your max rpm? Who knows. I wish they would give them a standard rating based on joules of energy for a given dwell. It's possible for a coil with a higher turns ratio to perform worse than a stock one with the same drive. The ignition has to be considered as a complete system.
Is your compression higher than stock? Are you spinning above 5000RPM? If not, you probably don't need fancy wires.
Click to expand...

I agree about the build quality and as far as ohms per foot goes I am not sore of how long the wires are that I was looking at and I am not sore how long my wires are. As far as modules go the kit I ordered came with a high Performance module. I also agree that they should have a standard for rating coils. I know that I will not get the claimed voltage but I would like to get as much out of it as I can. Any way thanks for all the great points.
for any one that is interested here is the link for the kit I ordered

http://www.ebay.com/itm/Chevy-HEI-C...Parts_Accessories&hash=item58b1416095&vxp=mtr
 
I have never been able to tell the difference in wires.. I usually buy the lifetime warranty ones from autozone and get an extra set if you burn one. They are 8mm silicone and last a long time if you don't burn them. I wouldn't spend 100+ bucks on wires ever.. just saying money better spent elsewhere.
 
sreidmx said:
I have never been able to tell the difference in wires.. I usually buy the lifetime warranty ones from autozone and get an extra set if you burn one. They are 8mm silicone and last a long time if you don't burn them. I wouldn't spend 100+ bucks on wires ever.. just saying money better spent elsewhere.
Click to expand...

thanks You hit the nail on the head there. How much are the wires you are talking about. I like to shop at o'reilly because my step dad has a busyness account with them and gets really good deals or I will get things online.
 
Agree on wires...most pan Accel wires, but in ~10 years I only had one fail so far, and I think that may have been my crimp. Keeping them away from the exhaust and any abrasion seems to be as or more important than who made them. I'm sure some of the bargain basement ones will fail pretty quickly, but that's true of just about anything.

I've thought of running some decent plug wire insulators down near the head just for peace of mind.
 
I second the lifetime wire set from autozone.

You will never know the difference.


Nothing wrong with stock HEI, limiting factor is high rpm.
 
I'm a fan of msd... it really easy to put in there ultimate HEI kit in about 45 minutes you can have it done and you get a small screw driver you can use to pull blown glass fuses..
 
I have no intentions of going beyond 5800RPMs so I do not think I will have a problem with it keeping up. I am thinking about running plug wire insulators. I will see what o'reillys has to offer. I also found these to day while I was looking around to what is out there. They seam to be pretty good and not too much money. What dose a nice set of wire go for to use as a reference.

http://www.ebay.com/itm/Vulcan-Extr...prg=20131017132637&rk=2&rkt=4&sd=221601362103
 
I do remember having buy one extra single wire due to the headers one wire in the set was a little short to run them the way I wanted.
 
wheel400 said:
I'm a fan of msd... it really easy to put in there ultimate HEI kit in about 45 minutes you can have it done and you get a small screw driver you can use to pull blown glass fuses..
Click to expand...

Yeah msd great just was looking for quick and a bit of am upgrade being as the guts of my dizzy took a cap. found a kit for good price order it and will be fixing it soon. The msd is a bit pricey for me. I like to a much no limits any amount of money as I can with out breaking the bank.
 
Last dizzy I bought was an msd street fire. Needed a pickup among several other things in my factory setup and the local parts store gave me the msd dizzy for what it would have cost to rebuild my factory setup. I noticed no difference performance wise between the msd and the factory stuff when it was working. Hei is good stuff. Look at the companies that provide hei conversions for other brands.

Used to work at oreillys and seemed to have lots of returns on the house brand lifetime wires. Local mechanic that I dealt with there once told me that acdelco wires were the best made:dunno:. Only thing I don't have delco wires on is my scout, got moroso wires with my msd dizzy, it all seems to be working just fine.
 
That's what I have right now the street fire. Put in on for trouble shooting and left it on.

I like the adjustable vac can tho.
 
I would like to say thanks to everyone who chimed in you guy really helped me understand things. I probably will get different plug wires but not any time soon since my wires are in ok condition. I guess we can call this a wrap. One more thing though what do you guys think about e3 plugs are they as good as they say they are. I thinking about getting a set.
 
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