Early Bouncing Pins

Page 2


This page shows a few of the instruments which have developed 
to measure detonation in the octane engine.

29kb Left: Springless Bouncing Pin

As detonation occurs, the diaphragm
strikes the inner pin once causing it to
rise and close the contact points.When
the pin drops back down there are no
contacts for that detonation because the
inner pin shoulder keeps it from touching
the diaphragm and bouncing upward
again. An Alnico magnet is used at the top
of the inner pin so that when the contact
points close they are held together 
magnetically until the inner pin starts to
descend. The upper contact points
break apart quickly and cleanly.


At right: Micrometer Head Bouncing Pin:

Many designs included a micrometer
adjusted inner pin so that only one contact
per detonation would occur if the 
micrometer head was propery adjusted.
These became known as " micrometer
head bouncing pins".

Another micrometer head bouncing pin
in which the inner pin is fitted with a
coil of fine wire. As the inner pin bounces
up and down the coil cuts the lines of
force of a fixed electro-magnet attached
to the barrel of the pin.

Left: Micrometer Head Bouncing Pin with
Electromagnetic Coil.


A condenser plate is attached to the
inner pin of the micrometer head.
As the pin bounces the capacity of the
condenser changes because the space
between the movable plate and the 
fixed plate changes.

Right: Micrometer Head Bouncing Pin
with Variable Condenser.


Left: Micrometer Head Combination
Bouncing Pin with Sunbury Pick-Up.




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Page created November 8, 2000

Updated 03/03/2007