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National air filter


Jrtm

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Anywhere except rn group to get a national air filter its a round cylinder about 4 - 5 inches long by 4- 5 inches wide. Or can i just put any filter in as i have a few round filters i thought i would clean mine and found there isnt one!

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  • 1 month later...

Some Engines have the top air intake as per RNs

Others have a different rocker cover and take the air through a filter box via two manifolds over the inlet valves.

David Mack's sounds to have this bit missing.

the filter is a washable coconut fibre? pad which should be lightly oiled.

I have one but don't know how to attach photo's yet.

best view I can find is

on the Stockton dry dock site.

Bob

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I took a bmw round fitler and cut the very blank and off and put the hole end over the hole seams to work well ill take pic tonight

So why the 2 designs by national was the side intakes a later development or as parts from rn ran out they developed a new system

This will explain the slightly sticking out round blanks then compared to flat ones on mine

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