<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt">I respectfully disagree that more air = more noise by default. "Noise" to a mechanical engineer (or most any engineer) is an undesireable by-product of inefficiency, i.e. whatever is causing the noise is sapping energy from whatever the machine is supposed to do (unless it's job is to make noise). Having said that, stub stacks should reduce noise -all else being the same - because the efficiency of the system is increased.<br><div><span><br></span></div><div>To that end, Allen opens up the issue of Bernoulli. In our carbs Bernoulli is working hard for us at the piston/bridge, not the inlet throat. Without some kind of "stack" Bernoulli is screwing with us at the carb inlet as the "apparent" inlet diameter gets smaller due to the air having to make a hard 90-degreee turn... turbulence is also introduced before the piston/bridge
which is not a happy thing for nice even fuel induction.<br><br>Those two reasons are what makes the mixture "change" when you put a stack on. Not more air, per se, but quality of air flow. <br></div><div><br>Mike!</div><div><br><br></div><div>Michael Anderson<br>One of a Kind Stuff/AEU<br>775 772-2056</div><br> <div style="font-family: times new roman, new york, times, serif; font-size: 12pt;"> <div style="font-family: times new roman, new york, times, serif; font-size: 12pt;"> <div dir="ltr"> <hr size="1"> <font size="2" face="Arial"> <b><span style="font-weight:bold;">From:</span></b> Wayne & Isabel Hardy <gwhardy@suddenlink.net><br> <b><span style="font-weight: bold;">To:</span></b> List for the Z Magnette Group - North America <zmagnette@autox.team.net> <br> <b><span style="font-weight: bold;">Sent:</span></b> Friday, November 15, 2013 1:19 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [Zmagnette] Stub
stacks<br> </font> </div> <div class="y_msg_container"><br>
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<div><font size="4">If the carbs are tuned again to compensate for more air to the
inlet, then more power should always be the result. If more power is “Better”,
then the answer is yes. But you must adjust for more airflow to get a more
better running motor..ie more air will need more fuel too if a result is to be
more power. Maybe a new, slightly richer needle is the ticket to heaven. I know
the K&N filter people caution that their filters flow so much more air than
the usual paper ones, that a richer needle, or jet, or slight enrichment
adjustment may be desirable for best running.</font></div>
<div><font size="4">Of course all this extra air flow is also likely to create
more inlet roar under acceleration. Is that “Better” or not???</font></div>
<div><font size="4">I personally run the MGA cleaner assemblies rather than the
Magnette one for better access to the carb adjustment screws for keeping up with
summer 100 degree days now swinging to winter 50 - 60 degree days and the
resultant changes in idle speeds due to cooler, denser air, and the need to
richen the mix by about 1/8th of a turn.</font></div>
<div><font size="4">MG put on the big old ugly oil bath filter for better engine
life in a variety of dirty dusty operating situations around the world, and for
more civilized operation in a quieter manner. Their true race motors ran with
velocity stacks and no filters usually.</font></div>
<div><font size="4"></font> </div>
<div><font size="4">Wombat</font></div>
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<div style=""><b>From:</b> <a rel="nofollow" title="bachldrs@comcast.net" ymailto="mailto:bachldrs@comcast.net" target="_blank" href="mailto:bachldrs@comcast.net">Allen Bachelder</a> </div>
<div><b>Sent:</b> Thursday, November 14, 2013 10:21 PM</div>
<div><b>To:</b> <a rel="nofollow" title="zmagnette@autox.team.net" ymailto="mailto:zmagnette@autox.team.net" target="_blank" href="mailto:zmagnette@autox.team.net">List for the Z Magnette Group - North
America</a> </div>
<div><b>Subject:</b> Re: [Zmagnette] Stub stacks</div></div></div>
<div> </div></div>
<div style="FONT-SIZE:small;FONT-FAMILY:'Calibri';FONT-WEIGHT:normal;COLOR:#000000;FONT-STYLE:normal;TEXT-DECORATION:none;DISPLAY:inline;">I'm
cautiously venturing beyond my paygrade here, but are we not talking about the
Bernoulli Principle: stating that as air enters a conical tube the air pressure
is maximized, but as the tube diameter conically diminishes, air pressure
decreases as air speed increases inside the carb. Without a conical stub
stack, there is no acceleration in the air entering the carb inlet. How
much lift would we get from a cross-sectionally flat airplane wing-top with a
squared-off leading edge?
<div> </div>
<div>That being said, how can the original Magnette intake plenum perform any of
this function? Same question for the intake plenums on T-series cars. I would
think they would be Bernoullian disasters. Would a Magnette engine always
run better with stub stacks rather than the original plenum?</div>
<div> </div>
<div>Curious in Michigan.</div>
<div> </div>
<div>(Allen)</div>
<div>
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<div style="WORD-WRAP:break-word;FONT-SIZE:12px;FONT-FAMILY:helvetica;FONT-WEIGHT:normal;COLOR:rgb(0,0,0);FONT-STYLE:normal;"><b><i>Allen
& Florrie Bachelder =iii=<<br>Spring
Creek Home for Wayward MGs</i></b></div>
<div style="WORD-WRAP:break-word;FONT-SIZE:12px;FONT-FAMILY:helvetica;FONT-WEIGHT:normal;COLOR:rgb(0,0,0);FONT-STYLE:normal;"><b><i>'57
ZB, '65 B, '69 C/GT, '73 B/GT</i></b></div>
<div style="WORD-WRAP:break-word;FONT-SIZE:12px;FONT-FAMILY:helvetica;FONT-WEIGHT:normal;COLOR:rgb(0,0,0);FONT-STYLE:normal;"><b><i>North
Street, MI 48049,
USA</i></b></div></span></div></span></div></span></div></span></div></span></div></span></div></span></div></span></div></span></div></span></div></span></div></span></div></span></div></span></div></span></div></span></div></span></div></span></div></span><b><i><span class="yiv1013556227Apple-style-span" style="FONT-SIZE:12px;">http://www.mgexperience.net/member/bachldrs</span></i></b><span class="yiv1013556227Apple-style-span" style="FONT-FAMILY:helvetica;FONT-VARIANT:normal;WHITE-SPACE:normal;BORDER-COLLAPSE:separate;TEXT-TRANSFORM:none;WORD-SPACING:0px;ORPHANS:2;WIDOWS:2;LETTER-SPACING:normal;LINE-HEIGHT:normal;TEXT-INDENT:0px;">
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<div>
<div>On Nov 13, 2013, at 7:33 PM, John Park wrote:</div><br class="yiv1013556227Apple-interchange-newline">
<blockquote type="cite"><span class="yiv1013556227Apple-style-span" style="WHITE-SPACE:normal;BORDER-COLLAPSE:separate;TEXT-TRANSFORM:none;WORD-SPACING:0px;FONT:medium helvetica;ORPHANS:2;WIDOWS:2;LETTER-SPACING:normal;TEXT-INDENT:0px;">
<div lang="EN-US">
<div class="yiv1013556227WordSection1" style="">
<div style="FONT-SIZE:12pt;FONT-FAMILY:'Times New Roman', serif;MARGIN:0in 0in 0pt;"><span style="FONT-SIZE:11pt;FONT-FAMILY:calibri, sans-serif;COLOR:rgb(31,73,125);">Depending
on length it can produce a much smoother flow, some say a bit of a ram effect
which increases power and torque . Longer stacks as in longer runners means
more torque while shorter ones mean more power. Not lots, but it all
contributes to a freer flowing intake which helps your freer flowing exhaust
to make a bit more power/torque and slightly better fuel economy. You
note vintage racers usually have anywhere from2.5 to 6 inch stacks. Some with
a stocking for a coarse filter, most just hoping nothing of consequence enters
the throat… I have a set of 2.25 inch stacks in my 3.25 inch K&N’s on my
MGB and they seem to help. Just the ho hum stock setup on my
Magnette.</span></div>
<div style="FONT-SIZE:12pt;FONT-FAMILY:'Times New Roman', serif;MARGIN:0in 0in 0pt;"><span style="FONT-SIZE:11pt;FONT-FAMILY:calibri, sans-serif;COLOR:rgb(31,73,125);"></span> </div>
<div>
<div style="BORDER-LEFT-STYLE:none;BORDER-TOP:rgb(225,225,225) 1pt solid;BORDER-BOTTOM-STYLE:none;PADDING-BOTTOM:0in;PADDING-TOP:3pt;BORDER-RIGHT-STYLE:none;PADDING-LEFT:0in;PADDING-RIGHT:0in;">
<div style="FONT-SIZE:12pt;FONT-FAMILY:'Times New Roman', serif;MARGIN:0in 0in 0pt;"><b><span style="FONT-SIZE:11pt;FONT-FAMILY:calibri, sans-serif;">From:</span></b><span style="FONT-SIZE:11pt;FONT-FAMILY:calibri, sans-serif;"><span class="yiv1013556227Apple-converted-space"> </span><a rel="nofollow" style="COLOR:blue;TEXT-DECORATION:underline;" ymailto="mailto:zmagnette-bounces@autox.team.net" target="_blank" href="mailto:zmagnette-bounces@autox.team.net">zmagnette-bounces@autox.team.net</a><span class="yiv1013556227Apple-converted-space"> </span>[mailto:zmagnette-bounces@autox.team.net]<span class="yiv1013556227Apple-converted-space"> </span><b>On Behalf Of<span class="yiv1013556227Apple-converted-space"> </span></b>Richard
Greenberg<br><b>Sent:</b><span class="yiv1013556227Apple-converted-space"> </span>Wednesday, November 13, 2013 12:34
PM<br><b>To:</b><span class="yiv1013556227Apple-converted-space"> </span>List for the Z
Magnette Group - North America<br><b>Subject:</b><span class="yiv1013556227Apple-converted-space"> </span>Re: [Zmagnette] Stub
stacks</span></div></div></div>
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<div style="FONT-SIZE:12pt;FONT-FAMILY:'Times New Roman', serif;MARGIN:0in 0in 0pt;">What
is a stub stack? Would it allow for a filter that lies closer to the engine
than a regular pancake filter?</div>
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<div style="FONT-SIZE:12pt;FONT-FAMILY:'Times New Roman', serif;MARGIN:0in 0in 0pt;">On
Nov 13, 2013, at 9:53 AM, Allen Bachelder wrote:</div></div>
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<div style="FONT-SIZE:12pt;FONT-FAMILY:'Times New Roman', serif;MARGIN:0in 0in 0pt;">I've
always just used the item #54 from the Moss catalog:<span class="yiv1013556227Apple-converted-space"> </span><a rel="nofollow" style="COLOR:blue;TEXT-DECORATION:underline;" target="_blank" href="http://www.mossmotors.com/Shop/ViewProducts.aspx?PlateIndexID=28996#top">http://www.mossmotors.com/Shop/ViewProducts.aspx?PlateIndexID=28996#top</a><span class="yiv1013556227Apple-converted-space"> </span> Are these from APT or Rimmer
better?</div>
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<div style="FONT-SIZE:12pt;FONT-FAMILY:'Times New Roman', serif;MARGIN:0in 0in 0pt;">Always
anxious to learn...</div></div>
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<div style="FONT-SIZE:12pt;FONT-FAMILY:'Times New Roman', serif;MARGIN:0in 0in 0pt;">Allen</div>
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<div style="FONT-SIZE:12pt;FONT-FAMILY:'Times New Roman', serif;MARGIN:0in 0in 0pt;"><span class="yiv1013556227apple-style-span"><b><i><span style="FONT-SIZE:9pt;FONT-FAMILY:helvetica, sans-serif;">****************************************************************</span></i></b></span><span class="yiv1013556227apple-style-span"><span style="FONT-SIZE:13.5pt;FONT-FAMILY:helvetica, sans-serif;"></span></span></div>
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<div style="FONT-SIZE:12pt;FONT-FAMILY:'Times New Roman', serif;MARGIN:0in 0in 0pt;"><b><i><span style="FONT-SIZE:9pt;FONT-FAMILY:helvetica, sans-serif;COLOR:black;">Allen
& Florrie Bachelder
=iii=<<br>Spring Creek Home for Wayward MGs</span></i></b><span style="FONT-SIZE:9pt;COLOR:black;"></span></div></div>
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<div style="FONT-SIZE:12pt;FONT-FAMILY:'Times New Roman', serif;MARGIN:0in 0in 0pt;"><b><i><span style="FONT-SIZE:9pt;FONT-FAMILY:helvetica, sans-serif;COLOR:black;">'57
ZB, '65 B, '69 C/GT, '73 B/GT</span></i></b><span style="FONT-SIZE:9pt;FONT-FAMILY:helvetica, sans-serif;COLOR:black;"></span></div></div>
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<div style="FONT-SIZE:12pt;FONT-FAMILY:'Times New Roman', serif;MARGIN:0in 0in 0pt;"><b><i><span style="FONT-SIZE:9pt;FONT-FAMILY:helvetica, sans-serif;COLOR:black;">North
Street, MI 48049, USA</span></i></b><span style="FONT-SIZE:9pt;FONT-FAMILY:helvetica, sans-serif;COLOR:black;"></span></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
<div style="FONT-SIZE:12pt;FONT-FAMILY:'Times New Roman', serif;MARGIN:0in 0in 0pt;"><span class="yiv1013556227apple-style-span"><b><i><span style="FONT-SIZE:9pt;FONT-FAMILY:helvetica, sans-serif;"><a rel="nofollow" style="COLOR:blue;TEXT-DECORATION:underline;" target="_blank" href="http://www.mgexperience.net/member/bachldrs">http://www.mgexperience.net/member/bachldrs</a></span></i></b></span><span class="yiv1013556227apple-style-span"><span style="FONT-SIZE:13.5pt;"></span></span></div>
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<div style="FONT-SIZE:12pt;FONT-FAMILY:'Times New Roman', serif;MARGIN:0in 0in 0pt;"><span class="yiv1013556227apple-style-span"><span style="FONT-SIZE:9pt;FONT-FAMILY:helvetica, sans-serif;COLOR:black;">****************************************************************</span></span><span style="COLOR:black;"></span></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
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<div style="FONT-SIZE:12pt;FONT-FAMILY:'Times New Roman', serif;MARGIN:0in 0in 0pt;">On
Nov 13, 2013, at 4:10 AM,<span class="yiv1013556227Apple-converted-space"> </span><a rel="nofollow" style="COLOR:blue;TEXT-DECORATION:underline;" ymailto="mailto:monster@caverock.net.nz" target="_blank" href="mailto:monster@caverock.net.nz">monster@caverock.net.nz</a><span class="yiv1013556227Apple-converted-space"> </span>wrote:</div></div>
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<div class="yiv1013556227MsoNormal" style="FONT-SIZE:12pt;FONT-FAMILY:'Times New Roman', serif;MARGIN:0in 0in 12pt;">Hi
everyone,<br><br>I'd like to get a pair of 1.5" H4 stub stacks and I've
tried emailing Steve Ash several times to see if he would make some more,
but I haven't got an answer from him.<br><br>So... from a light scour of
the internet there appears to be two types available at a reasonable
cost:<br>$32.50 ea -<a rel="nofollow" style="COLOR:blue;TEXT-DECORATION:underline;" target="_blank" href="http://www.aptfast.com/ShowItem/101221%20Billet%20Alloy%20Stub%20Stack%20SU%20HS4.aspx">http://www.aptfast.com/ShowItem/101221%20Billet%20Alloy%20Stub%20Stack%20SU%20HS4.aspx</a><br>$57
pair -<span class="yiv1013556227Apple-converted-space"> </span><a rel="nofollow" style="COLOR:blue;TEXT-DECORATION:underline;" target="_blank" href="http://www.rimmerbros.co.uk/Item--i-RL1396ALT">http://www.rimmerbros.co.uk/Item--i-RL1396ALT</a><br><br>I've
excluded the K&N ones as they are very rough, by all accounts.<br>Are
there any others that people would recommend?<br><br>They're going to fit
inside K&N filters that are 2 1/8" thick.<br><br>regards,<br>--<span class="yiv1013556227Apple-converted-space"> </span><br>Robert (in
NZ)<br>_______________________________________________<br>Zmagnette
mailing list<br><br>Donate:<span class="yiv1013556227Apple-converted-space"> </span><a rel="nofollow" style="COLOR:blue;TEXT-DECORATION:underline;" target="_blank" href="http://www.team.net/donate.html">http://www.team.net/donate.html</a><br>Archive:<span class="yiv1013556227Apple-converted-space"> </span><a rel="nofollow" style="COLOR:blue;TEXT-DECORATION:underline;" target="_blank" href="http://www.team.net/archive">http://www.team.net/archive</a><br>Forums:<span class="yiv1013556227Apple-converted-space"> </span><a rel="nofollow" style="COLOR:blue;TEXT-DECORATION:underline;" target="_blank" href="http://www.team.net/forums">http://www.team.net/forums</a><br>Unsubscribe/Manage:<span class="yiv1013556227Apple-converted-space"> </span><a rel="nofollow" style="COLOR:blue;TEXT-DECORATION:underline;" target="_blank"
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<div style="FONT-SIZE:12pt;FONT-FAMILY:'Times New Roman', serif;MARGIN:0in 0in 0pt;"> </div></div></div>
<div class="yiv1013556227MsoNormal" style="FONT-SIZE:12pt;FONT-FAMILY:'Times New Roman', serif;MARGIN:0in 0in 12pt;">_______________________________________________<br>Zmagnette
mailing list<br><br>Donate:<span class="yiv1013556227Apple-converted-space"> </span><a rel="nofollow" style="COLOR:blue;TEXT-DECORATION:underline;" target="_blank" href="http://www.team.net/donate.html">http://www.team.net/donate.html</a><br>Archive:<span class="yiv1013556227Apple-converted-space"> </span><a rel="nofollow" style="COLOR:blue;TEXT-DECORATION:underline;" target="_blank" href="http://www.team.net/archive">http://www.team.net/archive</a><br>Forums:<span class="yiv1013556227Apple-converted-space"> </span><a rel="nofollow" style="COLOR:blue;TEXT-DECORATION:underline;" target="_blank" href="http://www.team.net/forums">http://www.team.net/forums</a><br>Unsubscribe/Manage:<span class="yiv1013556227Apple-converted-space"> </span><a rel="nofollow" style="COLOR:blue;TEXT-DECORATION:underline;" target="_blank"
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<div style="FONT-SIZE:12pt;FONT-FAMILY:'Times New Roman', serif;MARGIN:0in 0in 0pt;"> </div></div></div>_______________________________________________<br>Zmagnette
mailing list<br><br>Donate:<span class="yiv1013556227Apple-converted-space"> </span><a rel="nofollow" style="COLOR:blue;TEXT-DECORATION:underline;" target="_blank" href="http://www.team.net/donate.html">http://www.team.net/donate.html</a><br>Archive:<span class="yiv1013556227Apple-converted-space"> </span><a rel="nofollow" style="COLOR:blue;TEXT-DECORATION:underline;" target="_blank" href="http://www.team.net/archive">http://www.team.net/archive</a><br>Forums:<span class="yiv1013556227Apple-converted-space"> </span><a rel="nofollow" style="COLOR:blue;TEXT-DECORATION:underline;" target="_blank" href="http://www.team.net/forums">http://www.team.net/forums</a><br>Unsubscribe/Manage:<span class="yiv1013556227Apple-converted-space"> </span><a rel="nofollow" style="COLOR:blue;TEXT-DECORATION:underline;" target="_blank"
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