pancake air filter

I've got a different oil tank but have filter fitted, I'll post a pic shortly

From what I see in the pic it is a single downtube, pre-featherbad frame?

I have this same issue with my 1957 Model 77. From what I have read, it never came with a filter? I would really like to fit one, ideally vintage aftermarket, such as Vokes, rather than a modern looking K&N. I will have the same concern with a 1952 ES2 project that is coming up

Anxious to see what comes of this thread

I posted a pic where did that go? This website does my head in!

It's raining so not going out to take a pic, here's one I prepared earlier! Zoom in to see the filter, but I'm not sure if it would fit if I had the standard oil tank.

There are 2 main types of pancake filter, the std one with the central hole for the carb connection and the offset one where the carb connection is not central. The offset one gives more scope for fitting into awkward spaces by turning the filter before finally tightening the clamp and I have used it sucessfully where no filter was fitted previously.

Previously john_day wrote:

I have an ES2 fitted with a 389 monoblock, but no air filter.

There is limited distance between the carb 1/34 i.d inlet and the oil tank. can anyone tell me if there is sufficient room for a pancake filter, and what type, or there any other solutions?

p.s. not a screw fitting on carb, fuel lines can move out of the way.

Apparently Norton's did have an air filter for the ES2, according to my copy of the "Spares List 1957 ES2, 19S and Model 50"

Here are some parts numbers

#19820 Air Cleaner 1 ea.

#19845 Air Cleaner Connecting Hose 1 ea.

#20139 Air Cleaner Hose Fixing Clips 1 ea.

#12342 Air Cleaner to Mudguard Fixing Bolts 2ea.

#E5379 Air Cleaner to Mudguard Fixing Bolt Washers 2ea.

#E3229 Air Cleaner to Mudguard Fixing Bolt Nuts 2ea.

#20137 Carburettor Adaptor 1 ea.

Hope this helps.

In my experience a bellmouth with gauze can present a significant restriction to airflow and noticeably reduce performance. The area of gauze needs to be significantly larger than the carburettor bore to maintain the airflow. The one I was using had a gauze diameter approx 45mm. The pre-monobloc 276 carb fitted to ES2 c1950 had a wide bellmouth with gauze as standard and is available new from Amal http://amalcarb.co.uk/pre-monobloc/76-276-series/air-intakes/276-gauze-intake-assembly.html

I don't know if that is compatible with monobloc carbs, Amal list only a plain, unobstructed, air intake tube for the 389.

Ian McD

That looks promising, would like to see a pic of the finished article. Stainless can be soldered if you have the appropriate alloy & flux. Try Activ8 acid cored 96S (96% tin, 4% silver) solder wire from Warton Metals Ltd. https://www.warton-metals.co.uk/stainless-steel.html

Ian McD

Whatâs wrong with bit of old tights and an elastic band?! Seriously though if you want an air filter a gauze wonât filter out abrasive dust.

One advantage of a wire mesh is that it acts as a flame trap so any backfire (what, on a Norton) will not ignite anything outside the carb.

Same principle as a Davy Lamp.