Stihlmans Wood,Tree cutting ramblings...........

[tdi-rick]

I think I need a Landy Rick, but how do I get a bit more poke out of it...

Which engine ?

I started typing up "drop an Isuzu 4BD1T into it..." but by the time I'd made the rest of the driveline bullet proof there wasn't much Landy left

 

[tdi-rick]

We better take this back to the dribble thread so we don't clog up Andrews thread with crap :monkey:

 

[Rudolf73]

Moved

 

[Stihlman441]

461R after about 8 to 10 tanks of fuel,the pre filter doesnt help much.

441R after around 20 tanks.:msp_biggrin: in simillar wood.

 

[tdi-rick]

Geez Andrew, sharpen your bloody chain !

 

[MCW]

461R after about 8 to 10 tanks of fuel,the pre filter doesnt help much

Prefilters never help much in our wood. All you end up with is two layers of crap to get off instead of one

 

[deye223]

stops the small chips getting in the pleats it's a PITA TO GET THEM OUT,, just the way I see it, I like them :msp_smile:

 

[Rudolf73]

stops the small chips getting in the pleats it's a PITA TO GET THEM OUT,, just the way I see it, I like them :msp_smile:

Agreed, thats why I use them.

 

[MCW]

The one thing they are good for is holding more crap against the filter - on the dry paper elements without a pre filter a lot of the crap falls off when the engine shuts down during sharpening or fueling up due to a lack of suction. I know opinions vary but Andrew's photos of the 461's filter pretty well sums up what I've said for years about pre filters. You have all this pleating designed into filters to increase filter surface area which extends the time between bloackages then you do a single layer prefilter over it and all that pleating becomes null and void.
With the dry paper filters like the HD2 and Dolmar HD it all just taps off anyway within seconds and when you get home a quick blast of air gets any stubborn chips out of the pleats.

I'd bet my left sweaty one that if guys did a comparo between using a pre filter and not using one and were completely unbiased they'd leave them off for good.

 

[Stihlman441]

Interesting deduction there Inspecter Matt,your a bit cleverer than i first figured.
Some thing else i have found with the R models with the large clutch cover and truck style mud flat direct the crap down and away from filter intake area.

 

[deye223]

The one thing they are good for is holding more crap against the filter - on the dry paper elements without a pre filter a lot of the crap falls off when the engine shuts down during sharpening or fueling up due to a lack of suction. I know opinions vary but Andrew's photos of the 461's filter pretty well sums up what I've said for years about pre filters. You have all this pleating designed into filters to increase filter surface area which extends the time between bloackages then you do a single layer prefilter over it and all that pleating becomes null and void.
With the dry paper filters like the HD2 and Dolmar HD it all just taps off anyway within seconds and when you get home a quick blast of air gets any stubborn chips out of the pleats.

I'd bet my left sweaty one that if guys did a comparo between using a pre filter and not using one and were completely unbiased they'd leave them off for good.

not this black duck might be that way on the huskys and dolly's as the filters are vertical but the stihl filters are just

about horizontal so the fines don't drop of my prefilters are staying on

 

[MCW]

Interesting deduction there Inspecter Matt,your a bit cleverer than i first figured.

I just made that up and have never touched a saw in my life

All prefilters do as far as chainsaws go is reduce the effective surface area of the filter. The bigger chips get stuck on the prefilter, which then catches the medium sized chips, which then start catching and holding smaller chips, which then start catching dust etc etc.
Same thing happens in swanky and costly irrigation filters with dirty water. The main filter might stop gear at 100 microns with the secondary filters designed to catch gear at say 30 microns. In the end the primary filter grabs larger particles which in turn grab smaller particles etc etc. The secondary filter would normally end up redundant so they get around this by running an auto flushing setup when the filter assembly reaches a certain pressure differential across the filter - although these setups are a precise fit unlike most of the chainsaw pre filters.
When chainsaws get an "auto flush" feature then prefilters will make a difference

Some thing else i have found with the R models with the large clutch cover and truck style mud flat direct the crap down and away from filter intake area.

Good stuff. That is one reason that despite being an afterthought the Dolmar HD filter setups work great in our wood because they are sucking air in from the back of the saw where the least amount of dust is. Air injected saw models are the worst for sucking in fine particulates when cutting dry and dusty wood.

 

[MCW]

not this black duck might be that way on the huskys and dolly's as the filters are vertical but the stihl filters are just

about horizontal so the fines don't drop of my prefilters are staying on

Hey not trying to start an argument but I'm running HD2's as well. One tap and 90% of the gear falls off, unless you're cutting green stuff and the sap is sticky or something?

 

[deye223]

Hey not trying to start an argument but I'm running HD2's as well. One tap and 90% of the gear falls off, unless you're cutting green stuff and the sap is sticky or something?

what argument just 2 opinions is all but if you want one I know a woman that will give one

 

[MCW]

what argument

Well you called yourself black first, and little

 

[Stihlman441]

and duck

 

[MCW]

and duck

Yeah but I've never met him so he could have feathers?

Anyway I blame Brad Snelling for these Outerwear filters. He started pimping out his saws with them and next thing you know it's like spoiler kits on little Jap cars. Every kid wanted one

 

[deye223]

and duck

well it is duck season

 

[deye223]

Yeah but I've never met him so he could have feathers?

Anyway I blame Brad Snelling for these Outerwear filters. He started pimping out his saws with them and next thing you know it's like spoiler kits on little Jap cars. Every kid wanted one

hey this is all Andrews fault he started me on them

 

[MCW]

well it is duck season

Good point and I shot one of those of said Black Ducks the other week He wasn't little though...