Quote:
Originally Posted by Frank Lee
Guess again. The thermostatic flaps closed up when cold to route hot exhaust through passages in the intake manifold, to heat the carb. They did not restrict exhaust enough for any EGR action.
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How can it send heated exhaust back through the intake manifold so that it wouldn't be drawn back into the engine? Was there a separate series of passageways just to heat the carb w/o actually sending any gas back through the engine? In either event the system would have to be some form of EGR since trapping gases in the manifold would result in some that are trapped in the cylinder and sending it back into the carb/intake to be drawn into the cylinder would do the same. EGR can be from the exhaust to the cylinder or just trapping more exhaust gases than normal in cylinder.