[Zmagnette] Stub stacks

[LannM at aol.com]

Allen:
 
I'm sure someone will give a more technical answer.  But.
 
The Bernoulli Principle takes place inside the carb, at the bridge where  
the jet comes through and works as you describe.
 
The sharp edge at the entrance to the carb causes turbulence which  
decreases the amount of air that can get in.  The stub stack (velocity  horn, 
trumpet, etc) smoothes out the air flow and allows more air to  enter.
 
Lann
 
 
In a message dated 11/14/2013 10:22:03 P.M. Central Standard Time,  
bachldrs at comcast.net writes:

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?  


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?


Curious in Michigan.


(Allen)
 
 
 
 
****************************************************************  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Allen  & Florrie Bachelder       =iii=<
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  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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On Nov 13, 2013, at 7:33 PM, John Park wrote:



 
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.
 
 
 
From: _zmagnette-bounces at autox.team.net_ 
(mailto:zmagnette-bounces at autox.team.net)  [mailto:zmagnette-bounces at autox.team.net] On Behalf Of Richard  
Greenberg
Sent: Wednesday, November 13, 2013 12:34  PM
To: List for the  Z Magnette Group - North America
Subject: Re: [Zmagnette] Stub  stacks


 
What  is a stub stack? Would it allow for a filter that lies closer to the 
engine  than a regular pancake filter?
 

 
 
On  Nov 13, 2013, at 9:53 AM, Allen Bachelder wrote:






I've  always just used the item #54 from the Moss catalog: 
http://www.mossmotors.com/Shop/ViewProducts.aspx?PlateIndexID=28996#top  Are these from APT 
or  Rimmer better?
 


 
Always  anxious to learn...

 
Allen
 
 
 
 
****************************************************************
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Allen  & Florrie Bachelder       =iii=<
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 13, 2013, at 4:10 AM, _monster at caverock.net.nz_ 
(mailto:monster at caverock.net.nz)  wrote:






Hi everyone,

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.

So...  from a light scour of the internet there appears to be two types  
available at a reasonable cost:
$32.50 ea 
-http://www.aptfast.com/ShowItem/101221%20Billet%20Alloy%20Stub%20Stack%20SU%20HS4.aspx
$57  pair - http://www.rimmerbros.co.uk/Item--i-RL1396ALT

I've  excluded the K&N ones as they are very rough, by all  accounts.
Are there any others that people would  recommend?

They're going to fit inside K&N filters that are 2  1/8" thick.

regards,
-- 
Robert (in  NZ)
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