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<blockquote data-quote="sparkywig" data-source="post: 621766" data-attributes="member: 3541"><p>Yes, the flaps are shut when the engine is cold to allow the engine to warm up gradually until the thermostat operates.</p><p>The thermostat linkage doesn't actually open the flaps fully, but direct the majority of the cooling air onto the heads. Without the flaps in place the cooling air is only funnelled by the cylinder tinware.</p></blockquote><p></p>
[QUOTE="sparkywig, post: 621766, member: 3541"] Yes, the flaps are shut when the engine is cold to allow the engine to warm up gradually until the thermostat operates. The thermostat linkage doesn't actually open the flaps fully, but direct the majority of the cooling air onto the heads. Without the flaps in place the cooling air is only funnelled by the cylinder tinware. [/QUOTE]
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