Heat baffle - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

xpc66 · 10-03-2004, 21:16

Why does the fuel injection manifold I have include a heat passage and heat baffle? I can understand the need for them with a carby, but the reason for the injection has me a little stumped

302xm · 10-04-2004, 00:34

Its used to reduce exhaust emisions by being connected to the EGR valve behind the throttle body it introduces controled amounts of exhaust to the intake at certain times to reduce the formation of nitrogen oxides in the combustion chamber .
The early carb style exhaust cross over was to heat the manifold to help prevent fuel drop out.

xpc66 · 10-04-2004, 00:38

Well I certainly wont be needing that then :s6:

302xm · 10-04-2004, 00:54

Quote:

Originally Posted by xpc66

Well I certainly wont be needing that then :s6:

Thats what i reckon too, so i bought a new carb manifold that dosn't have the exhaust crossover on it.

svo347 · 10-04-2004, 01:04

Heat baffle? as in the small shields underneath the manifold, facing the valley?

xpc66 · 10-04-2004, 02:31

Quote:

Originally Posted by svo347

Heat baffle? as in the small shields underneath the manifold, facing the valley?

Yes the baffle stops the oil in the valley from burning, but my concern is preheating the air before it goes into the engine, thus making it less dense.

svo347 · 10-04-2004, 02:36

Sorry mate I knew that, was trying to find out if you did lol..
The temp from the EGR isnt really that noticeable, but just the same i fitted a phenolic spacer without the hole between the upper/lower manifolds , blocking it off.