Modified Ignition questions
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Lead Driver
Joined: Mar 2008
Posts: 7,175
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From: Near Los Angeles
Modified Ignition questions
I am running a stand alone MSD box with a DS2 distributor and an MSD TFI coil. Coil gets straight 12v, as research says it should. I have gone through 3 TFI's in 3 years. It is bolted to the block with about 1" space. Is this a heat issue? I have also tried a non msd tfi and it lasted a year.
Yes, I will mount it away from heat next, but am I missing something with the wiring? I know DS2 and TFI are different eras, but spark is spark. Ideas?
Yes, I will mount it away from heat next, but am I missing something with the wiring? I know DS2 and TFI are different eras, but spark is spark. Ideas?
Postmaster
Joined: Nov 2011
Posts: 2,553
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I like to "match" ignition and coil per manufacturers guidelines - either OE or aftermarket. From memory, MSD recommends their "blaster" coil with MSD6. That is what I'm running on my hot rod and no issues.
Also, aftermarket oil filled coils are supposed to be mounted vertically, more or less, with the spark wire up. Keeps all the coils covered with oil for cooling and prevents leaks. If horizontal mounting is needed, an epoxy filled coil is recommended. Agree too much heat does not help either.
Also, aftermarket oil filled coils are supposed to be mounted vertically, more or less, with the spark wire up. Keeps all the coils covered with oil for cooling and prevents leaks. If horizontal mounting is needed, an epoxy filled coil is recommended. Agree too much heat does not help either.
New User
Joined: May 2019
Posts: 13
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I have just tried to install a new MSD Ready to Run Distributor and Blaster2 Coil. I have it at TDC. I have the plug wires in order and I installed the distributor and rotor directly facing number 1 plug. I followed the wiring diagram and ran the three wire where it said. Orange negcoil, redpositivecoil, blackground. I also hood the factory wires from the old coil back to the blaster. I can't get this thing running. I'm lost. It seemed to want to try and idle briefly before I gave up on it. Anyone have a detailed guide to install my particular distributor in a 76F150? Or possibly any advice.
New User
Joined: May 2019
Posts: 13
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I didn't know what the old coil wires were used for. Is it okay to feed 12v from the battey directly to the positive terminal on the coil?
Fleet Owner
Joined: Jan 2004
Posts: 26,007
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From: Brentwood,CA
For test starting? Sure. But you need the 12v on a keyed ignition source.
Lead Driver
Joined: Nov 2000
Posts: 6,623
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From: Albuquerque
With and MSD box the coil is run from the box, not from 12v. It's actually a lot higher voltage.Check your schematic at MSD>
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Fleet Owner
Joined: Jan 2004
Posts: 26,007
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From: Brentwood,CA
I gave the schematic above, he is not using a MSD box.
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