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post #1 of 7 (permalink) Old 10-03-04, 10:16 PM Thread Starter
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Heat baffle

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


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post #2 of 7 (permalink) Old 10-04-04, 01:34 AM
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Re: Heat baffle

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.
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post #3 of 7 (permalink) Old 10-04-04, 01:38 AM Thread Starter
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Re: Heat baffle

Well I certainly wont be needing that then :s6:

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post #4 of 7 (permalink) Old 10-04-04, 01:54 AM
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Re: Heat baffle

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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.
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post #5 of 7 (permalink) Old 10-04-04, 02:04 AM
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Re: Heat baffle

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

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post #6 of 7 (permalink) Old 10-04-04, 03:31 AM Thread Starter
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Re: Heat baffle

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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.

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post #7 of 7 (permalink) Old 10-04-04, 03:36 AM
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Re: Heat baffle

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.

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