High flow air filter for the MS460

[Bowtie]

I dont know if there is an improvement in flow and hp with the aftermarket setups. I do have experience in the area that "certain" aftermarket filters do not filter as well as stock setups.. I argued with BSnelling about this until I gave up. If you are building a hotrod toy, it doesnt matter so much, but if its a work saw I would be wary. I really dont think the stock HD filter setup is that bad. Just my opinion.

 

[blsnelling]

I argued with BSnelling about this...

Hey, I resemble that remark:greenchainsaw:

 

[RiverRat2]

And I thought you didn't drink to excess...:monkey:

Normally I dont,,,,, but I have been known to have my moments,,,,

I find that it is most prevalent after A difficult Monday,,,,, dealing with Insidious amounts of Gov. BS


BTW : thats one more reason to keep Killing Tree's!!!!!!! to feed the paper machines!!!!!!!!!!!!!!!!!!!!

 

[Bowtie]

Hey, I resemble that remark:greenchainsaw:

No offense meant Brad, all for arguments sake.

 

[blsnelling]

No offense meant Brad, all for arguments sake.

No sweat man.

 

[kevin j]

years back I rode mc with a guy who did not believe on using filter oil on the foam elements. 'if you do that, they just plug up with ####....'

a filter has to filter for a work saw....

k

 

[thenline]

Actual Max-Flow flowbench data

Well guys, I was hoping to get some feedback (others’ first-hand experiences) on carburetor tuning between the stock Stihl HD filter setup versus the Max-flow, but not seeing anything, I took it upon myself to spend some time on the flowbench and provide everybody some objective data on actual flow between the two systems, as well as slight variations to each as well.

If you open up the Word.doc, you'll see a summary of the flow data. I performed my testing at 28"H2O, but for all those more familiar with 25” or 10"H2O, I ran the conversions for those test pressures as well.

There's two sets of data within the document; the first is a set of high flow numbers flowing just the filters on a mounting plate. The mounting plate was machined with a 2 1/2" ID hole. I had this plate available and it fit the ID of the stock filter pretty closely, so I used it. The next set of data was measured through the complete intake system, and is the set of data that is of importance. The plate the intake system was mounted to was machined to match the carburetor bore. Attached to the plate is the carburetor (stock bore), air cleaner backing plate, radiused inlet, etc.

In the results are some generalized observations. I won't spoil the fun; I'll let you throw your thoughts around for a little while and come to your own conclusions.

Also included - if I do this correctly - are photos of each setup. Each photo is referenced to the data in the Word.doc.

Have fun!

 

[thenline]

More pics...

 

[thenline]

More...

 

[thenline]

Last ones...

 

[Stihl 041S]

With good info, how will they B1tch? Thats right, they don't need a reason.
Very nice work. Thanks. Many times, folks answer a question, just not the one you asked.

 

[thenline]

With good info, how will they B1tch? Thats right, they don't need a reason.
Very nice work. Thanks. Many times, folks answer a question, just not the one you asked.

Thanks for the kind words! It really was my pleasure; I owe it to this forum for being such an incredible wealth of knowledge and info.

I neglected to leave out a few items in my last post.
* The flow work was performed on a Superflow SF600 flowbench
* Flowing was all performed early this morning with ambients that remained fairly constant throughout the procedure.
* The reason for running a "dry 60-pore" and an "oiled 80-pore" is because the 60-pore is brand new and will be sold in an extra new M-F kit I have; the 80-pore filter is the filter I had on my saw when I originally discovered that it and my stock Stihl HD filter produced the same WOT RPM.
* The stock HD filter assembly (filter and wrap) are both near new, with only a few tanks of fuel run w/them on.

 

[Stihl 041S]

Bump

 

[Tzed250]

Some people hate it when facts get in the way of the truth...

 

[Lakeside53]

Nice mythbuster work!


Now... how about a bunch of tests with sawdust on the filters, and accounting for dust losses though the filter - using repeatable scientific methodology

 

[Trigger-Time]

thenline,

Thanks a bunch!

:yourock: :yourock:


Gary

 

[thenline]

Nice mythbuster work!


Now... how about a bunch of tests with sawdust on the filters, and accounting for dust losses though the filter - using repeatable scientific methodology

I couldn't agree with you more! I was pretty disappointed to see the small increase in flow; hardly worth the expense and additional maintenance/cleaning. It's deceiving in their advertisements, seeing the 135CFM vs 89CFM. But, as I found using the 2 1/2" ID plate, the potential for that flow difference is definitely there. You'll just never see the need for it, or utilize it on a motor that small in displacement, utilizing the stock carburetor (and exhaust, CR, etc.).

Thanks for the kind words from all; I'm off to the woods!

 

[Tzed250]

I couldn't agree with you more! I was pretty disappointed to see the small increase in flow; hardly worth the expense and additional maintenance/cleaning. It's deceiving in their advertisements, seeing the 135CFM vs 89CFM. But, as I found using the 2 1/2" ID plate, the potential for that flow difference is definitely there. You'll just never see the need for it, or utilize it on a motor that small in displacement, utilizing the stock carburetor (and exhaust, CR, etc.).

Thanks for the kind words from all; I'm off to the woods!

Proving the manufacturers are not a bunch of idiots...

 

[Trigger-Time]

I think, I use to clean my filter's more often than really needed.
When I first started milling, I would clean filter after 2 tanks of
fuel (066). Last time milling, cleaned filter one time while milling,
used 1.5 gal. in 066 that day. RPM's had not slowed down (by tach)
but it was lunch time so thought I would blow filter out and dust
out of saw. I had an 066 air filter cover with the top busted, cut
busted part of. Thought it might breather better and I could see
how dirty filter really was with out pulling cover.

This may sound crazy......but filter seems stay cleaner while milling
with top of cover cut off, it maybe all in my head.

 

[2dogs]

You can even buy special air filter grease.
I'd just put a thin bead of grease and make sure the screw/nut
are pulling the filter tight against the base. If the filter gets
smaller as it ages it might not be tall enough to fill the space
between the base and the cover.

And for you, Thenline...

I use a bead of grease on my cutoff saw, a Stihl TS350, but never on the chainsaws. The chainsaw carbs stay clean enough.