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Rans Inc.
Section 1
Model S-7LS COURIER
General Information
Revision - B May 8, 2007
1- 8
CARBURATOR HEAT
Each one of the two carburetors of the Rotax 912S engine has a separate pre heating
system consisting of a heat exchanger, heat control unit and connecting duct hose. One
control knob operates both systems. Figure 1- 1 shows the general layout of the design
(only the left side is shown).
Figure 1-1. Carburetor Heat
A heat exchanger is mounted to both sides of the exhaust muffler. The air entering the
carburetor (heat on selected) is downstream cooling air, which is further heated on the
sides of the exhaust muffler when passing through the heat exchanger.
The sides of the exhaust muffler provide sufficient area for heat transfer. Figure 1- 2
shows the muffler mounted heat exchanger.
Figure 1-2. Carburetor Heat Exchanger