[DeTomaso] High Ported Iron Closed Chamber 4V head flow results
mark skwarek
ehpantera at yahoo.com
Sun Feb 9 19:38:22 EST 2014
Are there any pictures of the vanes that are being discussed?
Mark
On Sunday, February 9, 2014 7:23 PM, Stephen Nelson <steve at snclocks.com> wrote:
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
SNClocks.com
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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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