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http://www.ultralightnews.ca/ Page 13 of 30
The Ultralight News - your one stop Ultralight News.
3.2.Exhaust gas temperature
Agauge that we recommend on all Hirth two stroke engines is the Westach Exhaust Gas Temperature gauge
(EGT) as in figure 3.2.1. This gauge is a reliable measurement tool that measures the exhaust gases as they
exit the engine. A rich fuel/air mixture which can be caused by improper jetting, clogged air filter, improper
prop setting, will generally show up as a cooler temperature. A too lean mixture can be caused by an air leak
or fuel blockage, can result in overheating and engine seizure.
Figure 3.2.1 Westach Dual EGT 029.30
The proper location of the EGT probe on the exhaust manifold is extremely important. Mounting the probe
too close or too far from the piston will result in an incorrect reading.
If the engine is installed with one carburettor, the probe needs to be located in the centre of one of the
exhaust manifold ports 85mm from the exhaust outlet of the engine cylinder exhaust port. If the engine is
installed with two carburettors, each probe needs to be located in the centre of each of the exhaust manifold
port, 85mm from the exhaust outlet of the engine cylinder exhaust port. Install the probe before reinstalling
the manifold and make sure the probe will not touch the other side of the manifold wall.
The 50mm round EGT the gauge will mount from the front of the panel and will require a 52.388mm round
hole, a U bracket holds it in place from the rear.
Figure 3.2.2 Exhaust gas temperature wiring diagram
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