[Zmagnette] Stub stacks

[Allen Bachelder]

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
****************************************************************

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] 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 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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