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MG MGB Technical - K&N and float chamber interference

Hi Everyone,

I bought my father a pair of K&N pancake filters for Christmas but we are having a little bit of difficulty fitting them.

We have only attached the base plate but its very tight against the fuel line of the float chamber (on both carburetors). Is this common? I dont know much about the float chambers but would we be able to rotate the lid of it by 120 degrees clockwise so we get more clearance?

Thanks for your help

Tom




T W Roblin

looks tight
vem myers

The pipe from the outboard side of the carburettor is an overflow exit. If you feed fuel in through here then you bypass the needle valve and will get float chamber overflow and eventual engine flooding. Of course this may be pipework to direct any overflow fuel away from the exhaust manifold/pipe. We have no picture of the other carb to judge this. This outlet on both my carbs is left unconnected.
Steve Church

Its just the float chamber breather/overflow pipe. Best to use a length of copper fuel pipe with a very tight 90" bend on the end and then a short piece of flexible fuel pipe to connect to the floast chamber outlet pipe stub. Both pipes should be bent to go through a clip using a bolt on the fuel pump blanking plate. extend the pipes down to below the sump face.
jim soutar

As others have said, it's the bowl vent/ overflow pipe. The fuel is fed from the back, by that braided hose.

How mine is set up is a short length of 1/4" fuel hose, a 90 deg elbow, pointing down, on both carbs.

The attached photo shows how the hoses run. Note, I used clear fuel resistant hosing.

Herb


Herb Adler

Great, thanks for your help everyone.
T W Roblin

Tom,

Do the mod I described here

http://www2.mgcars.org.uk/cgi-bin/gen5?runprog=mgbbs&mode=thread&access=&subject=71&source=T&thread=2011122020194131864

You use the base casting from the original air filter cans, and gain both space that you need, and a much better air inlet shape which must be worth some power.

Just need to cut a bigger hole in that end cap and make a new paper gasket to keep it all sealed.
D Balkwill

Here's the back view.


D Balkwill

This thread was discussed between 02/01/2012 and 08/01/2012

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