C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

MSD Street Fire Coil and distributor cap

 
Old 04-16-2019, 02:52 AM
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Cresencio Aragon
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Default MSD Street Fire Coil and distributor cap

Hello, I have owned my 1986 Corvette for about 2 years, I replaced my distributor cap with a stock cap but recently I put on MSD Street fire ignition wires. Now I would like to go with a MSD street fire distributor cap and street fire ignition coil. I read older post that if its not the clamp style hold downs you can modify them. But on Summit one customer said be careful if you have a digital dash. It will throw it off. Also does the 86 have a HEI advance curve Kit? I really cant remember looking at it when I pulled off the cap last time. This is my first experience with a Corvette and appreciate this web site it has got me through a lot with learning more about Corvettes. Thank you
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Old 04-16-2019, 08:08 AM
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Kevova
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Advance is controlled by ECM. No weights or vacuum advance. I didn't see a application, but it doesn't mean it couldn't be.
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Old 04-16-2019, 08:15 AM
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WW7
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For a s near stock car the original ignition system is more the enough.. No need for the more expensive aftermarket coils , wires and Ignition control modules..WW
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Last edited by WW7; 04-16-2019 at 08:17 AM.
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Old 04-16-2019, 09:20 AM
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3D-Aircrew
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I tried one a while back and found that the attaching clips just will not work with our distributor. I have an 1986 too. I guess you could cut off the clips and put long threaded bolts in their place ... stock is fine.

Last edited by 3D-Aircrew; 04-16-2019 at 09:21 AM.
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Old 04-17-2019, 05:46 AM
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Cresencio Aragon
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I am thinking just to stay stock, I would like to have all MSD Stuff, because I just bought some wire looms and have to re pull all the wires to run them nice and neat. But I can buy something else for the car if it wont make a power difference. Still up in the air though. Thanks for your help! I really appreciate it.
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Old 04-17-2019, 11:32 AM
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WW7
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Originally Posted by Cresencio Aragon View Post
I am thinking just to stay stock, I would like to have all MSD Stuff, because I just bought some wire looms and have to re pull all the wires to run them nice and neat. But I can buy something else for the car if it wont make a power difference. Still up in the air though. Thanks for your help! I really appreciate it.
Its been known on here for many years that buying the more expensive wires , plugs, coils, and ICMs makes no difference at all in performance of these cars. Until much money is spent on go fast motor parts ( heads, cam) the stock ignition is more then enough..WW

Last edited by WW7; 04-17-2019 at 11:53 AM.
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Old 04-17-2019, 03:36 PM
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My wife and I had a really nice Chevrolet Pick Up truck (V-6, 5 speed Silverado 1500) and always being someone who likes to tinker I put a MSD ignition and coil in the truck. I soon started replacing distributor caps and rotors every 6 months. My truck had the small cap HEI system on it and it turned out that inside the distributor cap there were highly charged electrical particles that were developing carbon tracks that were "alternate paths to ground" inside the cap. I switched back to the stock coil and it went away. The MSD coil was just a bit too hot for the small HEI distributor cap used on our engine.
Lesson learned: Don't use a high voltage coil if you have a small distributor cap.

We also own a 1968 Corvette, a 427 car that has the entire ignition system by MSD and it has been a great system. Each spark sounds like a welder and the car runs smoothly up to 6000 rpm, what more could you ask for? I have one of their earlier model tach drive MSD Billet Distributors and have great success with them. I did not want to hurt my factory Transistorized Ignition Systems so I pulled that system and installed the MSD stuff back in the early 1990's.

You should be happy with a MSD system and their coil as they do improve your emissions and sure make a hot spark (and a lot of them each time under 3000 rpm). I like the ability to crank my timing back 20 degrees while cranking so my starter doesn't have to work as hard. They also have a decent staff to answer questions and they seem to stand by their products.

Good Luck
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Old 04-19-2019, 03:00 PM
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SLVRSHRK
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Originally Posted by Cresencio Aragon View Post
Hello, I have owned my 1986 Corvette for about 2 years, I replaced my distributor cap with a stock cap but recently I put on MSD Street fire ignition wires. Now I would like to go with a MSD street fire distributor cap and street fire ignition coil. I read older post that if its not the clamp style hold downs you can modify them. But on Summit one customer said be careful if you have a digital dash. It will throw it off. Also does the 86 have a HEI advance curve Kit? I really cant remember looking at it when I pulled off the cap last time. This is my first experience with a Corvette and appreciate this web site it has got me through a lot with learning more about Corvettes. Thank you
I can validate the warning. While troubleshooting my 86, I swapped in an MSD coil from my 78. While it fixed the problem, it drove the digital tach crazy. I went and bought an AC Delco replacement and everything was good again. There is no real benefit to anything fancy on the L98 unless you are going to do a whole lot of work, and even then, the stock HEI is gonna be fine since they don't turn massive RPMs.

Best of luck
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