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UNDERSTANDING IGNITION DWELL

by Kelli Murrow

Thursday, July 1, 2021



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There are a number of different components required to produce the spark that
occurs at the tip of the spark plug including the distributor, ignition coil,
plug wires and of course the spark plugs. To ‘dwell’ on those components a
little closer, there is also a trigger device such as breaker points or a
magnetic pickup, two sets of coil windings, an advance assembly, cap, rotor,
distributor gear, electrode and more.

Each of these components plays a key role in the function of the ignition system
but we’re going to take the time to understand the term ignition dwell and how
it affects the performance of an ignition system. Ignition dwell, or dwell time,
has to do with process of building up high voltage in the ignition coil for each
firing of the spark plug. This charging of the coil takes place in a fraction of
a second every time a cylinder fires and is very important to any vehicle
running breaker points. The concept of dwell time will help you understand how
the advanced dwell control circuitry of a Pertronix Ignitor Electronic
Conversion Module can help with performance.

Coil Operation

To understand ignition dwell, we first need to review the operation of the
ignition coil. It may seem like magic to have 12 volts from the battery go into
the coil only to have it output a spark with at least 15,000 volts, but it is
all physics and principles of electricity. Inside every coil there are two sets
of windings surrounding an iron core. The primary windings are generally made up
of several hundred turns of heavy wire while the secondary set are made up of a
much smaller gauge wire consisting of thousands of turns. The number of turns
between the two windings is referred to as coil ratio or winding ratio such as
100:1 or 80:1. (Engineers can actually manipulate the voltage and amperage that
the coil creates with these turns ratios, but that is for another tech blog.)

As voltage runs through the primary windings to the negative coil terminal and
to ground, a magnetic field builds strength around the iron core of the coil.
When the trigger device of the distributor opens, such as the breaker points in
our example, the ground path is suddenly opened causing the magnetic field to
collapse to the thousands of windings of the secondary side. During this event,
the voltage is increased creating a much higher voltage that is directed to the
center terminal of the distributor, through the rotor and plug wire finally jump
across the spark plug gap in the cylinder.

What is Ignition Dwell

What does this have to do with ignition dwell? Dwell time is measured in the
number of degrees of the distributor’s rotation through which the contacts of
the points are closed. This is also known as saturation time, or the time when
the coil is producing a strong magnetic field in the primary side of the coil.
If the dwell time is reduced, the voltage output of the coil is weak. If the
dwell time is too long (the gap barely opens), an arc can travel across the
points reducing the output of the coil and even damaging the coil or points.
It’s a fine balance and is why the breaker points must be adjusted correctly,
which is also called setting the dwell.

On the distributor shaft in a V-8 engine, there is a cam with eight flat areas
and eight lobes. The switching arm of the breaker point assembly is spring
loaded and has a rubbing block that rides against the cam. Each time a lobe
comes up, it pushes the rubbing block which opens the points contact causing the
primary magnetic field to collapse to the secondary side releasing the spark. A
rule of thumb is to have about 28-32 degrees of ignition dwell time which can be
measured with a good old dwell meter and adjusted with the Allen-head screw on
the points assembly.

Breaker Points

Breaker points were used to trigger the coil for decades and there is no denying
their ability to get the job done on a stock engine for daily drivers, however
they do have their shortcomings. First, they’re mechanically operated which
means there is going to be wear over time and require adjustment. Secondly,
points were designed to handle a small amount of current which limits their
potential output, a hinderance for performance applications. Going back to the
mechanical side of things, at higher rpm, the mechanical arm of the points
assembly tends to bounce (sometimes called points float) resulting in ignition
misses and burning of the points themselves.

Electronic Dwell Control

For years, racers had to contend with the shortcomings of breaker points but
eventually electronic ignition controls and trigger devices came to their aid.
Pertronix developed their Ignitor Electronic Conversion Module which fits in
place of the breaker points assembly of most any distributor. The Ignitor is
triggered electronically resulting in improved accuracy and consistency. Thanks
to this technology, the Ignitor is capable of delivering twice the voltage
output to the plugs through improved control over the dwell time of the coil. In
fact, the Ignitor II and III Conversion Kits provide an adaptive dwell control
technology and high rpm correction to help maintain peak energy through minute
adjustments of the dwell time.

With the use of modern electronics, there is no reason to be concerned with
setting the dwell of an ignition system, however the concept of dwell time still
takes place in the coil. It’s just not something you need to worry about thanks
to Pertronix Performance Brands. With the largest selection and
most knowledgeable staff, PerTronix Ignition is your one stop shop.

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OUR CUSTOMERS CAN'T BE WRONG

4.3 star rating 493 Reviews




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0.0 star rating

03/16/23
Review by Anonymous User



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Ken M.
Verified Buyer

5.0 star rating

11/16/22
Used the Flame Thrower coil

Review by Ken M. on 16 Nov 2022 review stating Used the Flame Thrower coil
Used the Flame Thrower coil on my antique Farmall tractor. Now it starts
instantly, runs smother and pulls better that ever before!


On PerTronix 40011 Flame-Thrower Coil 40,000 Volt 1.5 ohm Black
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11/16/22
Reviewed on: PerTronix 40011 Flame-Thrower Coil 40,000 Volt 1.5 ohm Black
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Robert D.
Verified Buyer

5.0 star rating

11/16/22
1950 Ford 8N electronic Ignition Upgrade

Review by Robert D. on 16 Nov 2022 review stating 1950 Ford 8N electronic
Ignition Upgrade
Love the upgrade. Installed myself. Also, have a Pretronic electronic ignition
on my 1950 IH Farmall Super A


On PerTronix 1247XT Ignitor® Ford 4 cyl Electronic Ignition Conversion Kit
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11/16/22
Reviewed on: PerTronix 1247XT Ignitor® Ford 4 cyl Electronic Ignition Conversion
Kit
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Scott C.
Verified Buyer

5.0 star rating

08/30/22
Happy Customer

Review by Scott C. on 30 Aug 2022 review stating Happy Customer
72 Super Beetle starts and runs great. Has alot more fire in the wires and is a
breeze to time. Thanks


On PerTronix D7182504 Flame-Thrower Electronic Distributor Cast VW Type 1 Engine
Plug and Play with Ignitor III Vacuum Advance
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08/30/22
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John K.
Verified Buyer

5.0 star rating

08/14/22
The fit was fantastic. We'll

Review by John K. on 14 Aug 2022 review stating The fit was fantastic.
We'll
The fit was fantastic. We'll worth the investment. Shipping and handling was
great, thank you.


On Doug's Headers D453 1 5/8" 4-Tube Full Length Header Mopar A Body Small Block
Mopar 67-72 Metallic Ceramic Coating
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08/14/22
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Glen B.
Verified Buyer

5.0 star rating

07/27/22
72 ford f250

Review by Glen B. on 27 Jul 2022 review stating 72 ford f250
Started right up. First try. Easy install great purchase


On PerTronix 91281 Ignitor® II Ford 8 cyl Electronic Ignition Conversion Kit
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07/27/22
Reviewed on: PerTronix 91281 Ignitor® II Ford 8 cyl Electronic Ignition
Conversion Kit
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