Coil question
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Senior User
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Coil question
Looking for a new coil. I saw the MSD coil and am wondering if there's any improvement running it but still having the stock ignition module. Is there a performance ignition module available? Or should I just use the stock cheapo coil? Trucks a 93 f350 460 5 speed.
Logistics Pro
Joined: Mar 2005
Posts: 4,698
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From: Mexico, Missouri
I've had 2 fail at 2 different times on 2 different truck's.
My 22 year old coil does wonders! Just buy another Motorcraft coil if your really need one.
Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
A stock automotive ignition coil can generate an output voltage on the order of 30,000 volts. This is a sufficient voltage to produce arcs which jump an air gap of an inch or more.
So the stock coil has more than enough voltage to jump the gap in your spark plugs. So no after market coil can not give any more performance unless you have a non stock very high compression engine.
Some say you can improve some by advancing the timing two degrees but you then run the risk of spark knock.
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Yeah I tried advancing the timing a hair awhile back. It was fine around town and on cooler days, but out on the highway if I got into it it'd ping. Didn't really gain anything noticeably with it advanced anyway. The exhaust has just a little bit of a rich odor to it when idling, was hoping to get it cleaned up. All emission system working, and it's in tip top shape with low miles. Sometimes that's just the way it is.
Lead Driver
Joined: Feb 2002
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From: Greater Austin, Texas
If you're gonna jack up the timing, you also need to run a cooler thermostat so you stave of the pinging.
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Joined: Apr 2002
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From: Waterloo, Iowa
The plugs only draw what they need. So a "40,000 volt" coil is BS, in a way. Sure, it's capable of providing 40k volts, but this won't happen. Typically about 10k or so to fire plugs. 20k volt coil is used for a reserve voltage. Higher compression, or old plugs, worn out wires, etc increase the voltage needed to fire. I'd be concerned with the quality moreso than the voltage rating. Lots of cheap **** being produced these days. Normally, with ignition parts, there really is a difference compared to aftermarket. Go with OEM Motorcraft for things like caps, wires, rotors, coils etc. At least this was true in the past.
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