Which filter is best? MS460

[paragonbuilder]

I figured I'd start a new thread so it could be found easily. This is a test on the Dyno of which filter setup provides the most power. In my opinion the Dyno is not refined enough yet for these results to be considered fact. But with what we had here are the results.
I will post each setup with a picture and the Dyno run charts.
Edit: this is a ported ms460 from @jmssaws

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[paragonbuilder]

Here is the saw with a factory hd filter without the wrap. It has the cover on and the filter setup that is in the second picture.

 

[paragonbuilder]

This is the same filter but without the factory cover as shown in the picture.

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[paragonbuilder]

No cover seemed to make a decent improvement.


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[paragonbuilder]

Next I ran the saw with no filter at all.

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[paragonbuilder]

Next is a cross performance filter with the black foam insert removed so it will fit over the spitback guard.

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[paragonbuilder]

Next I removed the spitback shield and installed the black foam insert.

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[paragonbuilder]

The first two runs without the spitback shield make it appear it lost power but the third run looks ok...


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[paragonbuilder]

These runs were with a max flow filter with no cover.

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[paragonbuilder]

This is with the max flow filter and the max flow cover, with frog skins applied by Mike Lee.

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[paragonbuilder]

It appears to be substantially stronger with out the cover.


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[paragonbuilder]

Interestingly when I removed the max flow filter, I found this.

It looks like the filter was coming apart a little. Maybe if I had blown it out first it would have been ok.


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[paragonbuilder]

So in my opinion, based on these results, the max flow with no outer cover made the most power, followed by no filter at all.


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[paragonbuilder]

Assuming this data is correct, Why would it make more power with some filtration, than with wide open flow? Any theories?


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[MasterMech]

Assuming this data is correct, Why would it make more power with some filtration, than with wide open flow? Any theories?


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Turbulence at the entry of the intake? The filter smooths out the airflow into the carb throat?

 

[Redfin]

Tuning? Did you retune for each application?

 

[paragonbuilder]

Tuning? Did you retune for each application?

Yes I retuned each time.

 

[paragonbuilder]

Turbulence at the entry of the intake? The filter smooths out the airflow into the carb throat?

I like this thought! I was wondering if it had an effect on scavenging spitback???

 

[jmssaws]

Good job,I like testing

 

[paragonbuilder]

Good job,I like testing

What is your take on this Jason?