[Zmagnette] Stub stacks

Arch Boston arch.boston at twc.com
Fri Nov 15 14:37:56 MST 2013

Many years ago when MGAs were new cars Road and Track Magazine did a DIY article on a ram air set up.  I no longer have the magazine.  Not the same thing as stacks but related.  That was a terrific magazine in the 50's and 60's.  Anyone else remember the article?  Arch

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On Nov 15, 2013, at 3:55 PM, monster at caverock.net.nz wrote:

> On 16.11.2013 08:03, Allen Bachelder wrote:
>> The K&Ns are
>> slightly noisier than stock MGB air cleaners. I don't think that's
>> because they're less efficient. My guess is that they provide less
>> acoustic insulation.
> I'd agree with this - there is a lot of material in an oil-bath filter and a substantial metal container.
>> 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?
> Barney Gaylord has a section on stub-stacks at his website:
> http://mgaguru.com/mgtech/power/pp104.htm
> Interesting commments from one of the MGA crew:
> "Just been for a 25 mile drive to road test them, and the throttle response, in top gear particularly, is very noticeable over 2000 rpm. It makes the 40 to 60 mph acceleration noticeably better and more fun to drive".
> Another had a book with figures for the factory installed stub stack/backplate on the MGB - made a 5% improvement and BMC were stingy with unnecessary parts!
> I would certainly agree that I wouldn't pop a pair of these on until you've got the ignition working well and SUs balanced, tappet clearances set etc.
> regards,
> -- 
> Robert
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