- Honda Car Owner's Manual

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INTEGRATEDHEAD

The Honda Insight'scylinderhead hasa unique,

cast-in exhaust manifold that saves weight and

increasesexhaustheatretention.

Theexhaustportsarelocatedinsidethecylinder

headandaresurroundedbyawaterjacket.Ascoolant

passesthroughthejacket,itstemperatureisincreased

bytheexhaustheat.

Theindividualexhaust-manifoldrunnersarepart

of the head casting, just like the exhaust ports. The

shapeandlengthofthemanifoldrunnersisoptimized

for efficient flow, and the system offers the

advantages of faster heat transfer to the catalyst, for

faster lightoff. This decreases exhaustemissionsand

increases fuel efficiency. Eliminating the need for a

separate exhaust manifold also increases manufacturing efficiency, and offers greater compactness and

lowerengineweight.TheIMAengineistheworld'sfirstproductiongasolineenginetouseanintegrated

exhaustmanifold.

Newsparkplugpositionsandotherinnovationsyieldcompactcombustionchambers.

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