Looking for 2" OD conical air filter

[CountryBoy19]

I'm trying to source a replacement for a long discontinued air filter for a Swedish jackhammer.

It's 185 cc (to give an idea of required airflow) and the housing is a cylinder about 4" long with an ID of 1.920".

I would like to find a conical air filter that will slide in the housing. I don't mind hitting the OD of the filter with a sander if necessary.

I know OPE often uses conical filters but I can't seem to find the filter I need by searching applications etc. Can anyone help with potential sources, or if you have something with a similar filter let me know make/model so I can look for a filter using that info?

 

[timg]

https://strikeengine.com/air-filter-size-calculator-for-power-bhp/
Here is a good start.
Read, calculate, enjoy the info.

 

[CountryBoy19]

https://strikeengine.com/air-filter-size-calculator-for-power-bhp/
Here is a good start.
Read, calculate, enjoy the info.

That's good info! I had to guess at the hp bc there is no listed hp in the manual. Due to the unique way this thing works I don't think one could even accurately measure hp because a lot of the energy from combustion goes directly into striking the tool through a 2nd, opposing piston.

That being said, I put in 8 hp, which is approximately half of an equal sized 2-stroke motorcycle and got 3.5 square inches of filter which tells me why the piece of foam filter material jammed in the housing was choking it out (that's less than 3 square inches).

I'm also a bit questionable about the accuracy of that calculator for 2-stroke engines. I would think a 2-stroke would be pulling higher CFM because it's drawing in combustion air every revolution of the engine. I may need double that amount of filter area.

The cutaway view of the jackhammer shows a conical filter in the housing, see included image. The air enters from below, passes through the filter then out of the housing near the top of the filter.

 

[timg]

Bore and stroke are the main contributing factors. Although yes air flow through intake valves -4 str. versus transfers -2 stk. may have an impact. But upsizing filter area sure won't hurt. I have some more info for calculating muffler sizing but we will leave that for another day. Thx. timg

 

[r7000]

check out filter breather on amazon.
for example:

K&N Vent Air Filter / Breather: Washable and Resuable: 0.375 in/0.5 in (10 mm/13 mm) Flange ID; 1.75 in (44 mm) Height; 2 in (51 mm) Base; 1.5 in (38 mm) Top, Red , 62-1600RD

There's all sizes in the 1-2" range, not just K&N, that one specifcally $14, you can find them as cheap as $5...

RASNONE 12mm Air Filter Cold Air Intake Filter Breather Turbo Vent Air Intake Filter Cleaner Black Universal for car and Motorcycle