[Zmagnette] Stub stacks

[Kelvin Dodd]

Richard.

A stub stack is a short, usually cast aluminium piece that typically fits inside a pancake style filter assembly. It has a radiused edge and smooths the flow into the carburetor.

David Vizard did a lot of work on a flow bench back in the 70s and determined that the turbulence caused by the flat surface of such filters bolted directly to the carburetor could be reduced by installing such a device.

The MGB original air filters incorporate a similar design with an alloy adapter with radiused edges.

Snub stacks are expensive, so I'd only use them for racing or other performance use. Moss does carry an HIF44/6 snub stack for use with the MG supercharger kit.

http://www.mossmotors.com/Shop/ViewProducts.aspx?PlateIndexID=111408

I run a couple of snub stacks on a Weber 45 DCOE in my race car, again it's a lot of cash for a minor improvement.

Kelvin.




From: zmagnette-bounces at autox.team.net [mailto:zmagnette-bounces at autox.team.net] On Behalf Of Richard Greenberg
Sent: Wednesday, November 13, 2013 9:34 AM
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:

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