This category features timing wheels (also known as trigger wheels) ala carte
or with vehicle-specific mounting kits (for small block and big block Chevy
applications.
When you have an idea of where you want to mount the wheel, identify a
location for the sensor. Trigger wheels are available in 5-inch to 8.5-inch
diameters. The sensor must be mounted facing the outside edge of the wheel,
centered with a gap of roughly .030 inches. You will need to build a bracket
that allows for some adjustability while holding the senssor absolutely fixed
relative to the pulley. This can be particularly challenging in high-power or
harsh offroad conditions.
When you have identified and obtained your trigger wheel, mount the wheel
to the pulley. In most cases, it is best to turn this task over to a machine shop.
They should be able to do this for a reasonable amount of money. The wheel must
be absolutely centered on the pulley, with no run-out or "wobbble" in the space
between the mounted sensor and the edge of the pulley.
Once the pulley is mounted, a mount can be crafted for the sensor. This mount
must be relatively impervious to vibration and not allow the sensor to be
displaced by the torque of the engine. The mount must be attached to the engine
itself, otherwise the normal movement of the engine on it's mounts will make
the sensor completely unreliable.
We will be putting a course on this topic on our Holley EFI University
soon--watch for that. Until then, if you have any question at all, please
contact us and we will be
glad to give you expert guidance!
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