V-Net systems and V-series
recorders use two types of thermocouple setups to monitor the exhaust gas
temperatures, one for an individual cylinder application and another for 3
or 4 cylinder groups.
Measuring the EGTs on a single cylinder application
is accomplished using a thermocouple that features an inline, two-prong
mini-connector. This connector provides the union between the thermocouple
and the V-Net module. A selection of single cylinder thermocouples is
shown on next page.
The most frequently used setup is the four
thermocouples with junction box combination. This setup simplifies the
installation on V8 engines by grouping the four thermocouples on each
cylinder bank into a common junction box. The junction box then provides a
single wire connection to the V-Net module to facilitate service work. A
similar setup is available for V6 engines.
V-Net applications also use two styles of thermocouples.
Four cylinder motorcycles make use of the .187-inch diameter tip bullet-style
thermocouples, while Harley-Davidsons and the automotive applications employ
the .250-inch diameter Stinger-style thermocouples. When replacing a
thermocouple probe, use the illustration alongside the chart on the next page
to determine the length you will need. The thermocouples used with the
junction boxes, and some individual thermocouple components that are often
requested, are shown in the chart below.
EGT's & Controller
Single EGT &
Cable lengths on the single are: 27" of the stainless overbraid wire to the yellow plug and then 18" of the yellow wire to the V-net module totaling 45"