----- Original Message -----
Sent: Friday, December 07, 2001 10:38
AM
Subject: [Chevelle-List] Spark plugs
& Resistor wire.
Let me try and clear up some
confusion. First, I'm not an expert on this but I do have some knowledge on
the subject.
The HEI was was installed across the
GM car line in 1975 through 1980. After that computer controlled HEI's came
in. The main difference being the external vacume advance housing.
Conventional point dist. can only handle 2.5 amps before burning up. The HEI
can handle 4 amps. More amps, better coil saturation. Since the HEI needs a
full 12 volts to run efficiently (unlike points, 8 volts) you MUST lose the
resistance wire. The HEI can produce 35000 + volts but it needs the full 12
volts to do this. (coil saturation) The resistor wire causes a voltage drop
after starting. During starting it is by-passed. This wire is what kept the
points from burning up. Keith is right about the PINK wire. But don't make it
too long. The longer the path, the less voltage. As for spark plugs and the
HEI, you should be sure to use the right application. Plugs designed for
conventional ignitions should not be used because when you open the gap you
are really bending the electrode at an angle. To fire efficiently the ground
electrode should be flat over the center electrode. HEI plugs have a shorter
center electrode. And this allows for the larger gap. Larger gap, longer
spark. And don't over look the plug wires. You need at least 8mm wire. Use a
good silicone and wipe the inside of the plug and dist. boot. It not only
keeps moisture out but helps keep voltage loss down. Not to mention easier
boot removal. A very good book I bought several years ago was "IGNITION /
ELECTRICITY BOOK by Dr. Christopher Jacobs. It may still be available. I think
it cost around 15 bucks. Hope this small bit of info helps
everyone.
Rich
