Makita 6401/7910

[BJD85]

HD AIR FILTER....forgive me if this has been covered but I can't seem to find an opinion on this. Anyone find any advantage or disadvantage in keeping on that filter cover that comes with the actual filter itself? I for some reason can't post a puc now unkess i pay so sry...lol

 

[U&A]

Here is the IPL for the 6401. I dont see an oem HD air filter option


http://s30387.gridserver.com/partsDiagrams/Makita DCS6401.pdf


Sent while firmly grasping my redline lubed RAM [emoji231]

 

[BJD85]

Im actually specifically talking about the EA7900. Im not shure why it came up with that title. But I know the upgraode is available for it. What I'm asking is in yhe kit there a seperate cloth like peice that goes over the filter. Do y'all use that? Or does it restrict the airflow too much? It seems a bit overkill.

 

[James Miller]

The HD air filter is restrictive to begin with. I've heard of people losing 1k rpm just from installing it.

 

[BJD85]

That's some good info thank you. So I give it a rip with the added cover filteruHow did they measure the difference? Excuse my ignorance.

 

[cuinrearview]

Usually you'd use a tachometer to measure RPM.

 

[James Miller]

That's some good info thank you. So I give it a rip with the added cover filteruHow did they measure the difference? Excuse my ignorance.

I'd guess a tach. I have a 7910 with standard filter. Saw lives above the limiter so a tach wouldn't work for me.

 

[cuinrearview]

I'd guess a tach. I have a 7910 with standard filter. Saw lives above the limiter so a tach wouldn't work for me.

It's not above the limiter in the cut is it?

 

[BJD85]

Usually you'd use a tachometer to measure RPM.

Lol... I actually knew that. I read that wrong I skipped over where he said RPM and only saw the k. My 7900 comes in at around 12,200 RPM out. I think it droppes to around 10.5-11,000 RMP in. Thats with the limited coil/no mods and the aforementioned restrictive filter. What I'm talking about is the peice on the right in the photo. when I got the saw it was already on the filter slipped over top.

 

[BJD85]

I'll probably just run it off and see if there is a notible increase in rpm

 

[hunter72]

I think the HD filter has more restriction because of the inlet elbow on the H.D it looks like a 90 degree angle were the standard filter inlet elbow looks bigger and has a sweeping curve .= more air flow.
I pointed this out to Carl. Miller at one of the Iowa gatherings a few years ago and he said he was going to do some testing.
He is the man to ask.

 

[cuinrearview]

@MillerModSaws

 

[BJD85]

@MillerModSaws

The Legend has been summoned

 

[LogSawyer74]

I've always ran mine with the prefilter on. Never had any kind of issue, I couldn't imagine the throttle response being any better or it running any better with the prefilter off. The HD filter stays cleaner with the prefilter on (obviously). The 7900/7910 is a fantastic saw....

 

[pioneerguy600]

The outerware is just another layer of air restriction to the carb, if you don`t mind that then run it as it will keep the inner filter cleaner for a much longer period, the outerware cover can be washed and dried reused, the inner filter cannot.

 

[pioneerguy600]

My ported saws starve for air running any of the heavy duty filters so all but two I use for very dusty conditions run the regular flat type filters, they breathe so much better and if a fine steel mesh filter is available I run those, been doing so for 30 years without harm to any saw. Milling would be one condition a heavy duty filter would be required, dry dusty wood or a dusty environment as well. YMMV.

 

[James Miller]

It's not above the limiter in the cut is it?

No sir. Although the 13.5 limit of the OG 7900 would make them alot easier to tune.

 

[dustinwilt68]

I run mine w the HD setup, it's a better filter, tad more restrictive but it's worth it to me.

 

[Poleman]

I run them on my ported saw and have had no issues. I like the filtration of them on my saws.
I have built K & N filters to fit under the hood that work well too. They seem to flow a little better.

 

[cuinrearview]

I run them on my ported saw and have had no issues. I like the filtration of them on my saws.
I have built K & N filters to fit under the hood that work well too. They seem to flow a little better. View attachment 771080View attachment 771081 View attachment 771082

Good to hear from you Rich. Hope you're doing well.