Coil specs

[goes2fast]

I think I read somewhere that 4 cylinders use a different coil, so I am wondering which MSD coil to use in my 620 with a matchbox dizzy? I would like to use an epoxy coil if possible.  Thanks in advance for any help.

[datzenmike]

Coils are coils, 4, 6 or 8 cylinder. You only need 20-25K volts to fire a spark plug on a modified engine. To potentially drag 50K out of a coil more current needs to flow through it. To do this a lower impedance coil is often used and this puts a lot of strain on the matchbox. No plug fires at 50K or 40K volts or what ever the maker claims. Coils do not instantly fire at maximum voltage. The voltage climbs up a ramp increasing in strength, admittedly very fast. Once the air breaks down and the arc begins the voltage does not keep going up. The spark is a direct short to ground.

 

Get and use the proper Nissan coil. MSD are not going to be 'better' that them. Most after market stuff is shiny for a reason.... to attract buyers. That's all it is. Any '78 and up coil is an EI coil. 0.8 to 1.0 Ohms.

 

Why do people make such incredible claims about their after market coil? It called the placebo effect. If you spend $200 on a EI system it just  HAS to be better. The more expensive the more you are biased. Multiple spark?? Geezus when my plugs fire, why would I want to try firing them a second time???

[G-Duax]

I'm a sucker for big bad coil claims.........

My 620 with electronic dizzy has a Crane LS91 coil on it, and I have an HKS Twin-Fire ignition box going on it when the new engine goes in.

 

My Cressida is getting a Mallory 28880 Pro master CDI coil, that comes with a warning 'Danger - Leathal Voltage'.

Something like 65,000 volts at 1.5 amps - Shocking !  :w00t:

 

Will either ever need that kind of electron pressure ?

Probably not...

 

Fact is, if you suspect weak ignition for your application, modern Iridium plugs fire with less voltage.

But weak ignitions tipicly only come into play with boosted engines, or race engines with really high compression.

High cylinder pressure will cause ignition drop-out & misfire, and hotter coils will solve the problem.

[datzenmike]

Shiny colored fishing lures catch more fishermen than they ever catch fish.... you can quote me on that.

[Charlie69]

Shiny colored fishing lures catch more fishermen than they ever catch fish.... you can quote me on that.

:rofl: :rofl: :rofl: :rofl: :rofl: :thumbup:

[banzai510(hainz)]

blaster 2 is the same a stock 78/79 coil  .7ohm

[Dolomite]

After the remote ignitor box in my 510 went out, I switched to GM ignition module and had to change the coil cause the stock one didn't work right with it. I used an accel super stock, it worked well...for less than two years, it took a shit on me out at datsunville. James had me toss in the stock coil from a 200sx, so far so good. I have a feeling it's going to be there a while.

[banzai510(hainz)]

Dolomite

accel super stock is just a stock point coil. I think they made in China last time I saw the box. But the BIG Supercoils are still USA made.  Your n200sx is more likely the correct ohm value made to run on straight 12/14 volts.  depends if you had a 510 stock point coil in there then a ballast would be needed as it not made to run on 12/14volts but closer to 6volts(they will get HOT)

[goes2fast]

Is a ballast required for the matchbox?

[banzai510(hainz)]

this is how it works.

If you have a point coil you need a ballast. otherwise coil will run HOT

 

the matchbox persay dont need it.  just read the HOW TO section on electronic dist.

 

really its nice to know the specs instead of just reading the side of the coil saying need or dont need.

 

 

you can run a Matchbox with a ballast but use a 78/79 coils or a Blaster 2  coil remove ballast

 can run a Matchbox with the stock point coil and ballast also

[goes2fast]

So I don't need a ballast with the matchbox coil, thanks!

[banzai510(hainz)]

No you dont need a ballast if you order a 79 year coil as they are a .7 ohm coil that made to run on the 12/14volts

 

 

the wire that goes in to the ballast, just hook it up to the wire that is otherside of ballast(short it together)