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Thanks Kelvin,
And I'lll look forward to the cold air intake you have in the works.
Then can we have a discussion about why and how cold air intakes work?
Cheers,
Allen
****************************************************************
Allen & Florrie Bachelder =3Diii=3D<
Spring Creek Home for Wayward MGs
'57 ZB, '65 B, '69 C/GT, '73 B/GT
North Street, MI 48049, USA
http://www.mgexperience.net/member/bachldrs
****************************************************************
On Nov 15, 2013, at 6:28 PM, Kelvin Dodd wrote:
> Allen.
> =20
> First off they are pricey.
> =20
> There are two types of stub stack available for the 1.5=94 SU. Cast =
and machined. I=92ve not been impressed with the design of the cast ones =
which run about $20 each. The machined ones look like they will do the =
job, but run about $32 each.
> APT offers both types: =
http://www.aptfast.com/ListItems/SubCategory/SU%20Carburetors/Stub%20Stack=
s%20and%20Ram%20Pipes.aspx
> =20
> Second.
> =20
> At lower rpm the carburetor piston offers more flow blockage than poor =
fluid dynamics at the air filter plate. At WOT, it=92s a different =
matter.
> =20
> There are no doubt all kinds of peaks and valleys in fluid flow during =
the dynamics of accelerating and cruising up to 3500 rpm. I was told by =
one of my engineering teachers that anyone who professes to be an expert =
on fluid flow is a liar. He stated that it is still more of an art than =
a science and a dark art at that. In fact, after receiving a doctorate =
in the field he determined that aircraft are kept in the air by smoke =
and mirrors because the dynamic forces at work are too complex to be =
understood by the likes of mankind.
> =20
> If you have to run a pancake style filter, then by all means use a =
stub stack. Before they became available for the DCOE, I used to cut =
down the standard long trumpets and braze them up into short stacks. =
They will make some difference, though I doubt it=92s going to be really =
noticeable. =20
> =20
> Just work on the basics first.
> =20
> =20
> =20
> From: zmagnette-bounces@autox.team.net =
[mailto:zmagnette-bounces@autox.team.net] On Behalf Of Allen Bachelder
> Sent: Friday, November 15, 2013 11:03 AM
> To: List for the Z Magnette Group - North America
> Subject: Re: [Zmagnette] Stub stacks
> =20
> =20
> Kelvin - your point is well-taken. Are you saying that even if =
everything else is spot-on, it's still not worthwhile to mess with =
velocity stacks for those of us who spend most of our lives below 3500 =
rpm?
> =20
> _______________________________________________
> Zmagnette mailing list
>=20
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/archive
> Forums: http://www.team.net/forums
> Unsubscribe/Manage: =
http://autox.team.net/mailman/options/zmagnette/bachldrs@comcast.net
>=20
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<html><head><base href=3D"x-msg://689/"></head><body style=3D"word-wrap: =
break-word; -webkit-nbsp-mode: space; -webkit-line-break: =
after-white-space; ">Thanks Kelvin,<div><br></div><div>And I'lll look =
forward to the cold air intake you have in the =
works.</div><div><br></div><div>Then can we have a discussion about why =
and how cold air intakes =
work?</div><div><br></div><div>Cheers,</div><div>Allen<br><div>
<span class=3D"Apple-style-span" style=3D"border-collapse: separate; =
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"><b><i>****************************************************************</=
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style=3D"border-collapse: separate; font-variant: normal; =
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0px; text-transform: none; white-space: normal; widows: 2; word-spacing: =
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style=3D"border-collapse: separate; font-variant: normal; =
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0px; text-transform: none; white-space: normal; widows: 2; word-spacing: =
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after-white-space; "><span class=3D"Apple-style-span" =
style=3D"border-collapse: separate; font-variant: normal; =
letter-spacing: normal; line-height: normal; orphans: 2; text-indent: =
0px; text-transform: none; white-space: normal; widows: 2; word-spacing: =
0px; -webkit-border-horizontal-spacing: 0px; =
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-webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: =
auto; -webkit-text-stroke-width: 0px; "><div style=3D"font-family: =
Helvetica; color: rgb(0, 0, 0); font-style: normal; font-weight: normal; =
word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: =
after-white-space; font-size: 12px; "><b><i>Allen & Florrie =
Bachelder =3Diii=3D<<br>Spring Creek Home for =
Wayward MGs</i></b></div><div style=3D"font-family: Helvetica; color: =
rgb(0, 0, 0); font-style: normal; font-weight: normal; word-wrap: =
break-word; -webkit-nbsp-mode: space; -webkit-line-break: =
after-white-space; font-size: 12px; "><b><i>'57 ZB, '65 B, '69 C/GT, '73 =
B/GT</i></b></div><div style=3D"font-family: Helvetica; color: rgb(0, 0, =
0); font-style: normal; font-weight: normal; word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space; =
font-size: 12px; "><b><i>North Street, MI 48049, =
USA</i></b></div></span></div></span></div></span></div></span></div></spa=
n></div></span></div></span></div></span></div></span></div></span></div><=
/span></div></span></div></span></div></span></div></span></div></span></d=
iv></span></div></span></div></span><b><i><span class=3D"Apple-style-span"=
style=3D"font-size: 12px; "><a =
href=3D"http://www.mgexperience.net/member/bachldrs";>http://www.mgexperien=
ce.net/member/bachldrs</a></span></i></b><span class=3D"Apple-style-span" =
style=3D"border-collapse: separate; font-family: Helvetica; =
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">****************************************************************</span><=
/i></b></div></span></div></span></div></span></div></span></div></span></=
div></span></div></span></div></span></div></span></div></span></div></spa=
n></div></span></div></span></div></span></div></span></div></span></div><=
/span></div></span></div></span></div></span></div></span></div></span></s=
pan></div></span></span>
</div>
<br><div><div>On Nov 15, 2013, at 6:28 PM, Kelvin Dodd wrote:</div><br =
class=3D"Apple-interchange-newline"><blockquote type=3D"cite"><span =
class=3D"Apple-style-span" style=3D"border-collapse: separate; =
font-family: Helvetica; font-style: normal; font-variant: normal; =
font-weight: normal; letter-spacing: normal; line-height: normal; =
orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: =
none; white-space: normal; widows: 2; word-spacing: 0px; =
-webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: =
0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: =
auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div =
lang=3D"EN-US" link=3D"blue" vlink=3D"purple"><div class=3D"WordSection1" =
style=3D"page: WordSection1; "><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; "><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); =
">Allen.<o:p></o:p></span></div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; "><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); =
"><o:p> </o:p></span></div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; "><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">First =
off they are pricey.<o:p></o:p></span></div><div style=3D"margin-top: =
0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif; "><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125); "><o:p> </o:p></span></div><div =
style=3D"margin-top: 0in; margin-right: 0in; margin-left: 0in; =
margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New =
Roman', serif; "><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125); ">There are two types of stub stack =
available for the 1.5=94 SU. Cast and machined. I=92ve not been =
impressed with the design of the cast ones which run about $20 each. The =
machined ones look like they will do the job, but run about $32 =
each.<o:p></o:p></span></div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; "><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">APT =
offers both types:<span class=3D"Apple-converted-space"> </span><a =
href=3D"http://www.aptfast.com/ListItems/SubCategory/SU%20Carburetors/Stub=
%20Stacks%20and%20Ram%20Pipes.aspx" style=3D"color: blue; =
text-decoration: underline; =
">http://www.aptfast.com/ListItems/SubCategory/SU%20Carburetors/Stub%20Sta=
cks%20and%20Ram%20Pipes.aspx</a><o:p></o:p></span></div><div =
style=3D"margin-top: 0in; margin-right: 0in; margin-left: 0in; =
margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New =
Roman', serif; "><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125); =
"><o:p> </o:p></span></div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; "><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); =
">Second.<o:p></o:p></span></div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; "><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); =
"><o:p> </o:p></span></div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; "><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">At =
lower rpm the carburetor piston offers more flow blockage than poor =
fluid dynamics at the air filter plate. At WOT, it=92s a different =
matter.<o:p></o:p></span></div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; "><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); =
"><o:p> </o:p></span></div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; "><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">There =
are no doubt all kinds of peaks and valleys in fluid flow during the =
dynamics of accelerating and cruising up to 3500 rpm. I was told by one =
of my engineering teachers that anyone who professes to be an expert on =
fluid flow is a liar. He stated that it is still more of an art than a =
science and a dark art at that. In fact, after receiving a doctorate in =
the field he determined that aircraft are kept in the air by smoke and =
mirrors because the dynamic forces at work are too complex to be =
understood by the likes of mankind.<o:p></o:p></span></div><div =
style=3D"margin-top: 0in; margin-right: 0in; margin-left: 0in; =
margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New =
Roman', serif; "><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125); =
"><o:p> </o:p></span></div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; "><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">If =
you have to run a pancake style filter, then by all means use a stub =
stack. Before they became available for the DCOE, I used to cut down the =
standard long trumpets and braze them up into short stacks. They will =
make some difference, though I doubt it=92s going to be really =
noticeable. <o:p></o:p></span></div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; "><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); =
"><o:p> </o:p></span></div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; "><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">Just =
work on the basics first.<o:p></o:p></span></div><div style=3D"margin-top:=
0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif; "><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125); "><o:p> </o:p></span></div><div =
style=3D"margin-top: 0in; margin-right: 0in; margin-left: 0in; =
margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New =
Roman', serif; "><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125); "><o:p></o:p></span></div><div =
style=3D"margin-top: 0in; margin-right: 0in; margin-left: 0in; =
margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New =
Roman', serif; "><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125); =
"><o:p> </o:p></span></div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; "><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); =
"><o:p> </o:p></span></div><div><div style=3D"border-right-style: =
none; border-bottom-style: none; border-left-style: none; border-width: =
initial; border-color: initial; border-top-style: solid; =
border-top-color: rgb(181, 196, 223); border-top-width: 1pt; =
padding-top: 3pt; padding-right: 0in; padding-bottom: 0in; padding-left: =
0in; "><div style=3D"margin-top: 0in; margin-right: 0in; margin-left: =
0in; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New =
Roman', serif; "><b><span style=3D"font-size: 10pt; font-family: Tahoma, =
sans-serif; ">From:</span></b><span style=3D"font-size: 10pt; =
font-family: Tahoma, sans-serif; "><span =
class=3D"Apple-converted-space"> </span><a =
href=3D"mailto:zmagnette-bounces@autox.team.net"; style=3D"color: blue; =
text-decoration: underline; ">zmagnette-bounces@autox.team.net</a><span =
class=3D"Apple-converted-space"> </span>[mailto:zmagnette-bounces@aut=
ox.team.net]<span class=3D"Apple-converted-space"> </span><b>On =
Behalf Of<span class=3D"Apple-converted-space"> </span></b>Allen =
Bachelder<br><b>Sent:</b><span =
class=3D"Apple-converted-space"> </span>Friday, November 15, 2013 =
11:03 AM<br><b>To:</b><span =
class=3D"Apple-converted-space"> </span>List for the Z Magnette =
Group - North America<br><b>Subject:</b><span =
class=3D"Apple-converted-space"> </span>Re: [Zmagnette] Stub =
stacks<o:p></o:p></span></div></div></div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; =
"><o:p> </o:p></div><div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; =
"><o:p> </o:p></div></div><div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; ">Kelvin - your point is =
well-taken. Are you saying that even if everything else is spot-on, it's =
still not worthwhile to mess with velocity stacks for those of us who =
spend most of our lives below 3500 rpm?<o:p></o:p></div><div =
style=3D"margin-top: 0in; margin-right: 0in; margin-left: 0in; =
margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New =
Roman', serif; =
"><o:p> </o:p></div></div></div>_____________________________________=
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