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That wouldnt be a book by Dr. Jacobs inventer founder of Jacobs electronics
is it?
P. Hernandez
68 chevelle
"Keith Cooper"
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Spark plugs & Resistor wire.
velles.net
12/07/2001 09:40 AM
Please respond to
chevelle-list
You bring up a very good point. I have been purchasing spark plugs are a 71
Chevelle, when I should be buying plugs for a 1975 something. You have the
book, but I thought that HEI where put in 1972 cars. Thanks for the
information. I really overlooked the spark plugs application.
Keith
----- Original Message -----
From: Richard Milkiewicz
To: CHEVELLE
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
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