HEI Ignition Coils
Thread Starter
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Joined: May 2003
Posts: 77
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From: Calgary AB
HEI Ignition Coils
I've been thinking of changing my GM HEI coil in my 87 for an MSD or Accel performance coil.
Couple of questions first...
1. Is the GM coil the same as every other GM coil or is more powerful like the MSD and Accel are?
2. Has anyone noticed much difference going to the MSD coil? My L98 is mostly stock.
Couple of questions first...
1. Is the GM coil the same as every other GM coil or is more powerful like the MSD and Accel are?
2. Has anyone noticed much difference going to the MSD coil? My L98 is mostly stock.
Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
Re: HEI Ignition Coils (DESPERADO)
Aftermarket coils using the stock ignition module are a waste of your money and effort! Stock coils are designed to work with the ignition module, who knows what was on the mind of the aftermarket coil designer? The energy in the spark is determined by 1/2 LI*2, so to get more spark energy, either primary current needs to be increased (shortening the life of the ignition module), or the primary inductance must be increased (decreasing the maximum rpm the spark system can supply maximum spark energy). The stock ignition system is optimum for switched primary systems and you will find no difference if you install an aftermarket coil.
Burning Brakes
Joined: Feb 2000
Posts: 824
Likes: 2
From: Camden SC
Re: HEI Ignition Coils (severe-1)
Put my vote in with JFB.
Unless major modifications to compression, air flow, RPM changes, there is no return on investment. The stock coil is well suited to stock/near stock applications.
dlmeyers 90 coupe zf6 3 pseed shocks
Unless major modifications to compression, air flow, RPM changes, there is no return on investment. The stock coil is well suited to stock/near stock applications.
dlmeyers 90 coupe zf6 3 pseed shocks
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: HEI Ignition Coils (DESPERADO)
I run the HyperTech coil/cap/rotor combo, TPIS performance wires and AC Delco cut-back plugs gapped to .045" for an 8-10chp gain and solid spark to well over 5,000rpm.
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Thread Starter
Advanced
Joined: May 2003
Posts: 77
Likes: 0
From: Calgary AB
Re: HEI Ignition Coils
OK I think I prefer MSD products over the Accel.
I once installed the Accel in to my modified Camaro and I noticed better rpm response (quicker wind-up)
But, no one seems to have answered part 1 of my original post... Is the vette coil the same as every other GM HEI coil in the way of output?
I once installed the Accel in to my modified Camaro and I noticed better rpm response (quicker wind-up)
But, no one seems to have answered part 1 of my original post... Is the vette coil the same as every other GM HEI coil in the way of output?
Drifting
Joined: Aug 2000
Posts: 1,521
Likes: 0
From: West Islip New York
Re: HEI Ignition Coils (DESPERADO)
But, no one seems to have answered part 1 of my original post... Is the vette coil the same as every other GM HEI coil in the way of output?
As everybody else has already said, there's really no reason to upgrade the ignition. From the factory, this stuff is as good as you'll ever need.
