[DeTomaso] High Ported Iron Closed Chamber 4V head flow results

[Stephen Nelson]

I believe flow vanes act to reduce turbulence in a flow stream.  The
Reynolds number, a dimensionless quantity that is used to help predict
similar flow patterns in different fluid flow situations, is directly
proportionate to the diameter of the flow channel.  Putting in a vane
reduces the flow diameter, thereby reducing turbulence and increasing flow.

 

Stephen Nelson

 

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From: DeTomaso [mailto:detomaso-bounces at poca.com] On Behalf Of Charles
Engles
Sent: Sunday, February 09, 2014 4:16 PM
To: michael at michaelshortt.com; 'Sean Korb'
Cc: 'POCA list'
Subject: Re: [DeTomaso] High Ported Iron Closed Chamber 4V head flow results

 

Dear Michael,

 

 

                 I *think* the example was that the vanes act to minimize
the air flow from layering out into laminar flow and turbulent flow.   I
*think* it keeps the boundary layer from becoming laminar.

 

 

                                      FWIW,  Chuck Engles

 

 

 

From: DeTomaso [mailto:detomaso-bounces at poca.com] On Behalf Of
michael at michaelshortt.com
Sent: Sunday, February 09, 2014 5:57 PM
To: Sean Korb
Cc: POCA list
Subject: Re: [DeTomaso] High Ported Iron Closed Chamber 4V head flow results

 

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.
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. 

I don't get why that was an example.

Michael

On Feb 9, 2014 6:47 PM, "Sean Korb" <spkorb at gmail.com> wrote:

I'm not sure if this is germane but I am utterly fascinated.

http://speedtalk.com/forum/viewtopic.php?t=4785


On Sun, Feb 9, 2014 at 5:55 PM, Charles Engles <cengles at cox.net> wrote:
> Dear Dan,
>
>
>               You wrote:  "....and shear vanes screwed into the intake
port
> floors."
>
>               For the amateur engine builder, what are shear vanes?
>
>                              Very curious,  Chuck Engles
>
> -----Original Message-----
> From: DeTomaso [mailto:detomaso-bounces at poca.com] On Behalf Of Daniel C
> Jones
> Sent: Sunday, February 09, 2014 4:24 PM
> To: POCA list
> Subject: [DeTomaso] High Ported Iron Closed Chamber 4V head flow results
>
> A while back, Dave McLain flowed a set of old iron closed chamber 4V heads
> with the 1970's Pro Stock style high port exhaust plate and shear vanes
> screwed into the intake port floors.  I thought I'd share the results.
> Flowed on a Super Flow bench.  Tested at 10" and converted to 28".  2.19"
> intake valve and 1.71" exhaust. Completely stock combustion chambers.
>
>  Lift   Intake Exhaust
>
>  Inch   CFM    CFM
>
>  0.025   15.9   10.2
>
>  0.050   33.2   28.5
>
>  0.100   65.6   60.0
>
>  0.150  100.6   89.0
>
>  0.200  137.8  109.8
>
>  0.250  167.6  124.1
>
>  0.300  195.8  141.4
>
>  0.350  224.0  155.4
>
>  0.400  245.6  166.8
>
>  0.450  261.4  176.7
>
>  0.500  278.8  185.3
>
>  0.550  289.7  194.7
>
>  0.600  300.9  204.2
>
>  0.650  312.1  215.2
>
>  0.700  322.0  225.8
>
>  0.750  325.7  234.4
>
>  0.800  307.8  239.7
>
> Not too bad for 1970's small block cylinder heads.
>
> Dan Jones
>
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--
Sean Korb spkorb at spkorb.org http://www.spkorb.org
'65,'68 Mustangs,'68 Cougar,'78 R100/7,'60 Metro,'59 A35,'71 Pantera #1382
"The more you drive, the less intelligent you get" --Miller
"Computers are useless.  They can only give you answers." -P. Picasso

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