Self-Study Programme 248 The W Engine Concept - VolksPage.Net
Self-Study Programme 248 The W Engine Concept - VolksPage.Net
Self-Study Programme 248 The W Engine Concept - VolksPage.Net
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<strong>The</strong> secondary air ducting system<br />
Beside the coolant and oil ducts, the secondary<br />
air is guided via ducts and bores into the exhaust<br />
ducts near the exhaust valves. <strong>The</strong> secondary air<br />
flows into a duct in the cylinder head via a<br />
secondary air inlet valve.<br />
Oil return<br />
holes<br />
Secondary air duct<br />
Coolant<br />
Oil ducts<br />
Secondary air<br />
From here the secondary air is guided back into<br />
the cylinder head via grooves in the exhaust<br />
flange. <strong>The</strong> secondary air then flows via ducts<br />
and bores to the exhaust valves.<br />
S<strong>248</strong>_172<br />
Groove in exhaust flange<br />
Connection for secondary air<br />
inlet valve<br />
Bores leading to exhaust<br />
valve (internal)<br />
Bores leading to exhaust<br />
valve (external)<br />
Exhaust valves<br />
(external)<br />
Exhaust valves<br />
(internal)<br />
S<strong>248</strong>_174<br />
S<strong>248</strong>_169<br />
27
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