[Diy_efi] Basic exhaust KE question

[Mike]

I've noticed most higher performance drag cars or others which use
conventional turbos have some distance (at least a foot or so) such
that the (still burning exhaust gases) don't melt the blades, after
all the exhaust blades are in the center of the flow line, hence get
a fair whack of heat. The distance you are suggesting wont be
significant - after all you aint looking for a transient response
are you - just plenty of power,

rgds

mike



At 11:20 PM 9/10/2002 -0500, you wrote:
> We have an experimental project involving turbos.  One topology has them 
>located up "close" at the end of the headers/collectors (as they normally 
>should be).  Another topology has them located 6 more feet down from the 
>collector.
> The question (and concern obviously) is the negative effect of this 
>added segment length.  We know it is going to hurt efficiency, but were 
>not sure not the potential severity. We thought by keeping the collector 
>smaller than usual and uniform all the way to the turbo and wrapping the 
>segment with ThermalTec (or equiv), the effect would be minimized, thus 
>preserving as much as possible the kinetic energy of the exhaust.  (The 6 
>ft segment is perfectly straight; no bends.)
> We'll probably build it both ways, but wanted check with the crew here 
>on their opinions/experiences/predictions on this.  Any existing 
>empirical data out there on EGT drop over longer than typical sections 
>like this?
> And if there is any interest, I'll certainly post our EGT measurements 
>from it.
>
>
>
>Marc J. Reviel
>Director of Engineering
>PowerLogix R&D, Inc.
>http://www.powerlogix.com
>Forced-Air Systems of Texas
>http://www.f-a-s-tonline.com
>
>
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>

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