Another chainsaw dyno...

[huskihl]

The only problem I can see is as soon as the chain touches the wood thasf extra energy would dissipate. Seems the engine would have to work harder to gain rpm again.

Maybe why most race saws have lighter flywheel vs a heavier one?

Spool back up just before returning back to the wood for the up cut?

You’d need a momentum wheel. I’d guess it would need to be in excess of 2’ in diameter with perimeter weighting to be of any real benefit

 

[Nutball]

I don't mean for any kind of performance race saw thingy I mean more flywheel weight for chug along work saw power like an 090 with it's huge heavy clutch and flywheel.
Must be something wrong with me I don't want a 16k revs 600mph chain speed saw lol

A really heavy flywheel should reduce vibration too. Alot of engine vibration is from torque if I'm not mistaken, so a heavy flywheel should absorb alot of that.

 

[Red97]

I don't mean for any kind of performance race saw thingy I mean more flywheel weight for chug along work saw power like an 090 with it's huge heavy clutch and flywheel.
Must be something wrong with me I don't want a 16k revs 600mph chain speed saw lol

Would be an interesting test.

Do they make a light flywheel for the 090? Could probably pull half the shoes. And see if it loses any lug?

Much over 14k for me gets impractical lol

Was talking with another guy thst prefer the heavy slower saws with big chain in the super hard dense wood. May be something to it.

We could be spoiled here with the softer wood species.

 

[Red97]

As for flywheel weight alone...
Doesn't change the actual power being produced, just the dynamics of how the engine reacts to load on acceleration/deceleration.
This is something I wouldn't think the dyno is measuring at all (at least with only rpm and torque as inputs) and shouldn't affect the numbers on the graph one way or the other.

Probably a big reason why the dyno doesn't tell the whole story as to the personality of a saw...

They dyno really does mask the personality of the saws.

Seems as soon as the load is applied any "stored" energy would be lost, and unless load was dropped for another wind up. The energy would not return.

 

[rogue60]

Would be an interesting test.

Do they make a light flywheel for the 090? Could probably pull half the shoes. And see if it loses any lug?

Much over 14k for me gets impractical lol

Was talking with another guy thst prefer the heavy slower saws with big chain in the super hard dense wood. May be something to it.

We could be spoiled here with the softer wood species.

Yeah a sports car is fun but to pull a plow a tractor doesn't even get a sweat up.

 

[Wilhelm]

Most builders that are still here don’t give 2 *s-words if their saw wins a dyno run. They know there is always a better and faster one somewhere.

Pretty cool thread without any buts or tears. Hopefully Joe can continue on without any drama.

I think that if You are in the tuning business and can't take competitive competition You may want to consider a different hobby/job.

Just outing my thought on this topic, this post is not directed to anyone particular.

 

[Fruecrue]

You’d need a momentum wheel. I’d guess it would need to be in excess of 2’ in diameter with perimeter weighting to be of any real benefit

Finishing the cut 45 seconds after running out of fuel?

 

[RI Chevy]

I missed all the drama, thread gettin locked & stuff. Did the truth teller machine ruffle some feathers, did the flying tiger beat a builder's 'personal' saw? I wanna know...but I get it, once the mops have cleaned the floor, we as men just move on as if nutt'in ever happened.

You schnooze you lose.

 

[dustinwilt68]

Let the testing resume

 

[huskyboy]

Stopping and starting in a cut, clearing the bar of chips under the rail from a stop, recovering from stalling without pulling out of the cut, making face cuts, bore cutting, noodling, cutting off knobs/crotches from logs, milling, cutting frozen hardwoods ... those are all places where the “workability” attitude of the saw will show quite quickly.... I guess for a lack of a better word.

 

[Wilhelm]

You’d need a momentum wheel. I’d guess it would need to be in excess of 2’ in diameter with perimeter weighting to be of any real benefit

Magnetic clutch to compensate for acceleration/deceleration FTW.
That way the engine can spool up without being held back too much by the weight, and the weight could help keep the engine run at higher rpm's once the chain touches the wood.
There would be next to no extreme loads acceleration/deceleration wise.

My first car had a magnetic clutch driven fan, engine rpm goes up fan rpm goes up, engine rpm goes down so does the fan rpm - both with a delay on the fans side.
From what I recall the fan was huge in diameter compared to modern electric fans.
I always thought it to be an ingenious design.
Although, I have never looked into how that fan design worked.

Food for thought.

 

[Red97]

Let the testing resume

Need more saws to show up. Make a days worth

 

[00wyk]

Y'aller crazy.

Who's gonna mod one of these and dyno it?

 

[00wyk]

Ya just need to enlarge the spinny thing inside them:

And then find a way to push more leptons through it.

 

[Nutball]

Ya just need to enlarge the spinny thing inside them:

And then find a way to push more leptons through it.

That sounds right up my alley if I had the extra hobby funds laying around. With electric motors you can just alter the duty cycle from continuous, to 30, 15, or 5 second cuts at a time with a few minutes cool down time. The main issue is getting the most out of the battery without overheating the battery, or modding it to accept a bigger battery, unless you want to use a backpack battery, which would be easiest.

 

[Deets066]

Stopping and starting in a cut, clearing the bar of chips under the rail from a stop, recovering from stalling without pulling out of the cut, making face cuts, bore cutting, noodling, cutting off knobs/crotches from logs, milling, cutting frozen hardwoods ... those are all places where the “workability” attitude of the saw will show quite quickly.... I guess for a lack of a better word.

Exactly, but the great thing about this dyno.


It will tell you that if you know how to interpret it.

 

[Red97]

Exactly, but the great thing about this dyno.


It will tell you that if you know how to interpret it.

Yep, once a couple of normal saws are run. The shape of the graph with allow people to see the things they feel.

 

[Deets066]

Yep, once a couple of normal saws are run. The shape of the graph with allow people to see the things they feel.

You do any more hybrid runs yet Joe?

 

[huskihl]

@Red97
Any stock or ported saws you want to see? I can try and get a couple started up before Sunday

 

[Canadian farm boy]

You do any more hybrid runs yet Joe?