Dull chains...does it really kill saws....how?

[malk315]

The added load is from dogging in and pulling up on the handle to get it to cut, which results in added bar/chain friction. The resulting added heat makes its way from the bar to the saw.
A sharp chain loads a saw way more than a dull one. It's the dogging in to get it to cut that creates the added heat

huskihl's statement makes the most sense to me. Well said.

I avoid cutting with dull chains, so I can't really say if dogging in and pushing really hard would create more load on the saw -- probably not. I just hate the abuse that I think a saw gets from running with a dull chain for any extended period of time with all of the extended amount of pushing like crazy to try and get the stupid thing to cut. I've had a bar and clutch heat up back when I didn't know how to sharpen and would try to finish whatever I was cutting with dull chain. Had the clutch on my 262 smoking one day when trying to flush a stump... lot of pushing on the handle and abuse... ouch.

 

[Wolverine]

The added load is from dogging in and pulling up on the handle to get it to cut, which results in added bar/chain friction. The resulting added heat makes its way from the bar to the saw.
A sharp chain loads a saw way more than a dull one. It's the dogging in to get it to cut that creates the added heat

I agree, but this little voice in the back of my mind is saying... 9k in the cut is 9k in the cut. Sharp chain takes no effort, chain is self feeding, everyone's happy. Dull chain is still at 9k but it's taking longer and I'm pulling up real hard... 9k is 9k
So the added friction on the bar is leaching its way into the cylinder, causing transfer of the slug?

 

[Wolverine]

How's that, popcorn friends

 

[Magic_Man]

You ever had a sharp chain make smoke in the cut.........

 

[huskihl]

So the added friction on the bar is leaching its way into the cylinder, causing transfer of the slug?

Or causing seal and/or bearing failure from added heat. Which in turn leads to transfer if not caught quick enough

 

[Wolverine]

Or causing seal and/or bearing failure from added heat. Which in turns leads to transfer if not caught quick enough

Thank you sir!

 

[huskihl]

I agree, but this little voice in the back of my mind is saying... 9k in the cut is 9k in the cut. Sharp chain takes no effort, chain is self feeding, everyone's happy. Dull chain is still at 9k but it's taking longer and I'm pulling up real hard... 9k is 9k
So the added friction on the bar is leaching its way into the cylinder, causing transfer of the slug?

Also, as in Custer's post above, sharp cutters are being pulled away from the bar in a rocking motion. They don't create as much heat because they're not being forced into the wood by the bar.

 

[Wolverine]

Sometimes the twisty route is the best one... all my 2 wheel friends can attest to this.

 

[Stihlkillstrees]

Too much heat, you'll be tearing the saw apart to replace the clutch side crank bearing.

 

[danimal]

Yikes look at the bottom of the con rod.

Looks like 50-1 w/87 efuel. . .

 

[Mattyo]

yup, the more I look into all this it really seems like 50:1 runs perfectly but with zero margin for error... more oil = more margin for error.

 

[danimal]

I agree, but this little voice in the back of my mind is saying... 9k in the cut is 9k in the cut. Sharp chain takes no effort, chain is self feeding, everyone's happy. Dull chain is still at 9k but it's taking longer and I'm pulling up real hard... 9k is 9k
So the added friction on the bar is leaching its way into the cylinder, causing transfer of the slug?

CORRECTO MUNDO!

 

[Wolverine]

Now I can't wait for the thermo-cam...

 

[danimal]

yup, the more I look into all this it really seems like 50:1 runs perfectly but with zero margin for error... more oil = more margin for error.

THERE CAN BE ONLY ONE!
32-1...W/FULL SYN OIL..
WHICH IS TWAT I BE TRYN TO TELL
ALL YOU PUPS!
Heat reduction. . .

Always err on the safe side.
Mid to hi octane,,,efree. Dont increase da pony dispenser in chainsaws. . . Lets em runn a lil cooler....LIFE extension is a good thing

 

[danimal]

Now I can't wait for the thermo-cam...

They thought they was gonna put one up my arse during radiation treatment for prostate -big C.

Didnt happen, they needed more staff on hand to get that dun.
LOTS MORE STAFF

My roids got so bad ,,,i could cut em off wiff scissors like doughnuts while sittn on da pooper.

 

[TJ the Chainsaw Mechanic]

i agree.... but why?

Ok, issue that stihlkillstrees didn't mention is that more than likely the chain will stop turning on the bar before it kills the saw. I had a new saw that didn't want to oil and the chain was visibly smoking way before the saw even had bogged down. You'll probably break something bar and chain related before you toast the saw....then again...it could be the other way around.

Here's the thing with a 2 stroke....since it relies on oil in the fuel for lubrication.....Heat and Lube have a fairly Fine line. And Load or no Load will have a Huge play in that. To much load causes oil to build up which creates carbon which leads to carbon scoring and more heat and...you guessed it...saw's killed.

Not enough load creates a lean seizure....even if a saw is properly tuned. Crap revving it forever would probably score things up....that's like revving the crap out of a car in neutral...who does that anyway. Gonna have the same affect eventually. If a saw could hold to crap revving without a load and not be prematurally worn out....then I'm crazy.

So, a sharp and well oiled chain is a sunday run for a saw. You have proper load, low heat, and dust is minimal.
Dull chain, less oil flow as you are forcing down on the saw, more heat as it is taking much longer to do the same cut and because there's less oil so more friction is created. Plus the dust factor is multiplied which creates quick build up on the air filter.

Bars get deep groves from 3 things....loose chain...dull chain....no oil. But who the hell cares about the bar.

 

[Wolverine]

Just got weird in here, I'm out.

 

[jake wells]

straight gas kills a saw pretty quick.

 

[Mattyo]

only 7 pages in and you are out? but your makin more sense than most lol

 

[Mattyo]

yes jake...