<p dir="ltr"></p>
<p dir="ltr">> Well I guess that answered that.<br>
><br>
> ;-)<br>
><br>
> Thanks.<br>
><br>
> Michael<br>
><br>
> On Feb 9, 2014 10:03 PM, "Daniel C Jones" <<a href="mailto:daniel.c.jones2@gmail.com">daniel.c.jones2@gmail.com</a>> wrote:<br>
>><br>
>> > Not sure why the Jet engine was used as an example, those S shaped port directors in those engines are designed to slow the air down by several hundred miles per hour before it enters the jet engine. SST and SR71 did too<br>
>><br>
>> The 727 is subsonic so no need to reduce the flow by several hundred<br>
>> MPH. There are vortex generators, turning vanes and stators, none of<br>
>> which are used to slow air down. The pupose of vortex generators is to<br>
>> energize the boundary layer (intentionally trip the laminar boundary<br>
>> layer to turbulent) because turbulent boundary layers are less likely<br>
>> to separate. Turning vanes are used to direct flow and stators are<br>
>> designed to cancel the swirling effect of rotating elements like<br>
>> compressors. On supersonic aircraft, inlets are designed to reduce<br>
>> flow to subsonic speeds before it flows through the compressor. This<br>
>> can be done with active geometry (opening up throat area) or by using<br>
>> a shock wave. The SR-71 used variable inlet geometry and also<br>
>> directed most of the flow at high speeds around the compressors to the<br>
>> outside of the engine into ramjet like sections of the engine.<br>
>><br>
>> > Why would you want to slow down your fuel air mix? Performance items like Blowers and Superchargers are used to increase the speed and pressure to attain greater performance.<br>
>><br>
>> For a normally aspirated engine, there are flow losses that occur as<br>
>> you get transonic speeds. As speed is increased to 0.6 Mach or so,<br>
>> the energy required to increase the flow speed is more than the power<br>
>> increase associated with the increased velocity. The limiting case is<br>
>> the choked flow that occurs as throat velocity is increased to Mach 1.<br>
>> In cases like that, increasing the minimum cross-sectional area to<br>
>> slow the flow will result in increased power. With a supercharger,<br>
>> you can get an increase in mass flow rate due by compression.<br>
>><br>
>> Dan Jones<br>
>><br>
>> On Sun, Feb 9, 2014 at 5:57 PM, <a href="mailto:michael@michaelshortt.com">michael@michaelshortt.com</a><br>
>> <<a href="mailto:michael@michaelshortt.com">michael@michaelshortt.com</a>> wrote:<br>
>> > Not sure why the Jet engine was used as an example, those S shaped port<br>
>> > directors in those engines are designed to slow the air down by several<br>
>> > hundred miles per hour before it enters the jet engine.<br>
>> > SST and SR71 did too.<br>
>> > Why would you want to slow down your fuel air mix? Performance items like<br>
>> > Blowers and Superchargers are used to increase the speed and pressure to<br>
>> > attain greater performance.<br>
>> ><br>
>> > I don't get why that was an example.<br>
>> ><br>
>> > Michael<br>
>> ><br>
>> > On Feb 9, 2014 6:47 PM, "Sean Korb" <<a href="mailto:spkorb@gmail.com">spkorb@gmail.com</a>> wrote:<br>
>> >><br>
>> >> I'm not sure if this is germane but I am utterly fascinated.<br>
>> >><br>
>> >> <a href="http://speedtalk.com/forum/viewtopic.php?t=4785">http://speedtalk.com/forum/viewtopic.php?t=4785</a><br>
>> >><br>
>> >><br>
>> >> On Sun, Feb 9, 2014 at 5:55 PM, Charles Engles <<a href="mailto:cengles@cox.net">cengles@cox.net</a>> wrote:<br>
>> >> > Dear Dan,<br>
>> >> ><br>
>> >> ><br>
>> >> > You wrote: "....and shear vanes screwed into the intake<br>
>> >> > port<br>
>> >> > floors."<br>
>> >> ><br>
>> >> > For the amateur engine builder, what are shear vanes?<br>
>> >> ><br>
>> >> > Very curious, Chuck Engles<br>
>> >> ><br>
>> >> > -----Original Message-----<br>
>> >> > From: DeTomaso [mailto:<a href="mailto:detomaso-bounces@poca.com">detomaso-bounces@poca.com</a>] On Behalf Of Daniel C<br>
>> >> > Jones<br>
>> >> > Sent: Sunday, February 09, 2014 4:24 PM<br>
>> >> > To: POCA list<br>
>> >> > Subject: [DeTomaso] High Ported Iron Closed Chamber 4V head flow results<br>
>> >> ><br>
>> >> > A while back, Dave McLain flowed a set of old iron closed chamber 4V<br>
>> >> > heads<br>
>> >> > with the 1970's Pro Stock style high port exhaust plate and shear vanes<br>
>> >> > screwed into the intake port floors. I thought I'd share the results.<br>
>> >> > Flowed on a Super Flow bench. Tested at 10" and converted to 28".<br>
>> >> > 2.19"<br>
>> >> > intake valve and 1.71" exhaust. Completely stock combustion chambers.<br>
>> >> ><br>
>> >> > Lift Intake Exhaust<br>
>> >> ><br>
>> >> > Inch CFM CFM<br>
>> >> ><br>
>> >> > 0.025 15.9 10.2<br>
>> >> ><br>
>> >> > 0.050 33.2 28.5<br>
>> >> ><br>
>> >> > 0.100 65.6 60.0<br>
>> >> ><br>
>> >> > 0.150 100.6 89.0<br>
>> >> ><br>
>> >> > 0.200 137.8 109.8<br>
>> >> ><br>
>> >> > 0.250 167.6 124.1<br>
>> >> ><br>
>> >> > 0.300 195.8 141.4<br>
>> >> ><br>
>> >> > 0.350 224.0 155.4<br>
>> >> ><br>
>> >> > 0.400 245.6 166.8<br>
>> >> ><br>
>> >> > 0.450 261.4 176.7<br>
>> >> ><br>
>> >> > 0.500 278.8 185.3<br>
>> >> ><br>
>> >> > 0.550 289.7 194.7<br>
>> >> ><br>
>> >> > 0.600 300.9 204.2<br>
>> >> ><br>
>> >> > 0.650 312.1 215.2<br>
>> >> ><br>
>> >> > 0.700 322.0 225.8<br>
>> >> ><br>
>> >> > 0.750 325.7 234.4<br>
>> >> ><br>
>> >> > 0.800 307.8 239.7<br>
>> >> ><br>
>> >> > Not too bad for 1970's small block cylinder heads.<br>
>> >> ><br>
>> >> > Dan Jones<br>
>> >> ><br>
>> >> > _______________________________________________<br>
>> >> ><br>
>> >> > Detomaso Forum Managed by POCA<br>
>> >> ><br>
>> >> > DeTomaso mailing list<br>
>> >> ><br>
>> >> > <a href="mailto:DeTomaso@poca.com">DeTomaso@poca.com</a><br>
>> >> ><br>
>> >> > <a href="http://poca.com/mailman/listinfo/detomaso_poca.com">http://poca.com/mailman/listinfo/detomaso_poca.com</a><br>
>> >> ><br>
>> >> ><br>
>> >> > _______________________________________________<br>
>> >> ><br>
>> >> > Detomaso Forum Managed by POCA<br>
>> >> ><br>
>> >> > DeTomaso mailing list<br>
>> >> > <a href="mailto:DeTomaso@poca.com">DeTomaso@poca.com</a><br>
>> >> > <a href="http://poca.com/mailman/listinfo/detomaso_poca.com">http://poca.com/mailman/listinfo/detomaso_poca.com</a><br>
>> >> ><br>
>> >><br>
>> >><br>
>> >><br>
>> >> --<br>
>> >> Sean Korb <a href="mailto:spkorb@spkorb.org">spkorb@spkorb.org</a> <a href="http://www.spkorb.org">http://www.spkorb.org</a><br>
>> >> '65,'68 Mustangs,'68 Cougar,'78 R100/7,'60 Metro,'59 A35,'71 Pantera #1382<br>
>> >> "The more you drive, the less intelligent you get" --Miller<br>
>> >> "Computers are useless. They can only give you answers." -P. Picasso<br>
>> >><br>
>> >> _______________________________________________<br>
>> >><br>
>> >> Detomaso Forum Managed by POCA<br>
>> >><br>
>> >> DeTomaso mailing list<br>
>> >> <a href="mailto:DeTomaso@poca.com">DeTomaso@poca.com</a><br>
>> >> <a href="http://poca.com/mailman/listinfo/detomaso_poca.com">http://poca.com/mailman/listinfo/detomaso_poca.com</a><br>
>> ><br>
>> ><br>
>> > _______________________________________________<br>
>> ><br>
>> > Detomaso Forum Managed by POCA<br>
>> ><br>
>> > DeTomaso mailing list<br>
>> > <a href="mailto:DeTomaso@poca.com">DeTomaso@poca.com</a><br>
>> > <a href="http://poca.com/mailman/listinfo/detomaso_poca.com">http://poca.com/mailman/listinfo/detomaso_poca.com</a><br>
>> ><br>
>><br>
>> _______________________________________________<br>
>><br>
>> Detomaso Forum Managed by POCA<br>
>><br>
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