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MG MGB Technical - fitting of K&N pancake filters + Stub stacks

Hi all,
I was wondering if anyone has fitted K&N pancake filters + Stub stacks to their B GT ? I would be grateful for any info / assistance on how to fit the stubs to the filter (on the inside of the inner filter plate ??) and how / what bolts to use to fit the filter to the carb (the existing air filter bolts done appear to be useable ??)

thx a lot ...
Jon

Jon,

A great MG technical manual has been produced by Steve Strange -way to go Steve! You (and every MG owner)should get a copy of that fine effort if you want to understand more about our cars.

Coincidentally his manual is a present topic of discussion and you can see the item several lines below this one (at least it is at this time).

His manual will tell you what to do and, more importantly, why you are doing it.

Joe
Joe Lucas

Hi Jon,
From memory, I think I had to source 5/16 UNF bolts about 1/2" long. The stub stack does go inside the inner filter plate.

Charlie.
Charles Goozee

Jon

I have K&Ns fitted and didnt have the stub stacks fitted at first as the car was running well.
After fitting the stub stacks, the car seemed to idle smoother so I think they are well worth fitting.

Rob
R J Collier

Another option, if you are not in love with the pancake filters, is to use the cast base from your OE Coopers filter setup which has a built in velocity stack/air horn) with 3+" long K&N direct replacement filters and a plate to close off the open end (you can even just reuse the Cooper can's main cover and simply remove the rear closing ring).

Or, you can use that same cast base with the conical K&Ns (similar to what you see the rice racers use on their air intakes) which have a moulded front end closure and a rubber mounting ring at the rear which is simply clamped on to your backing plate.

Many racers take this latter approach as it allows them to either recess the backing plate's mounting bolt heads flush with the surface of the backing plate or use shallow curve rounded head bolts to mount the rear casting. Doing this, they are able to eliminate the extension tubes and long mounting bolts/studs from the interior of the air filter assembly, and thereby, create a much smoother and less tubulent airflow into the carbs.
Bob Muenchausen

This thread was discussed on 18/04/2007

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