Another chainsaw dyno...

[Bigmac]

So you want to add back in the variable of the wood to see which one is stronger?

What size wood? The hybrid will probably smoke the 395 in small wood, to medium wood would be fun to see. And Is it the heavier rotating assembly that allows it’s long bar abilities, or will the hybrid stomp the 395 in anything?

 

[Red97]

Saws are used for cutting wood... or am I wrong? Please correct me if I’m off base, maybe I am being too realistic.

Well to be fair, I am using the same bar/chain and sprocket on all the saws.

 

[TreeLife]

Saws are used for cutting wood... or am I wrong? Please correct me if I’m off base, maybe I am being too realistic.

An engine is an air pump, a pump's true potential is realized when loaded. A load is a load, whether it's a chain in the wood or being loaded via a dyno and resistance. The dyno does not care about cutting style, hot rod chains, or any other variables other than engine variables. Temp, mixture, engine speed and load. Its unbiased information.

 

[Woodpecker]

Saws are used for cutting wood... or am I wrong? Please correct me if I’m off base, maybe I am being too realistic.

Normally I'd agree, but the whole point of the dyno (and this thread) is to remove as much variation as possible.

 

[Red97]

If anyone is in the market for a turd 395, let me know.

I can hook you up....

 

[Redfin]

Saws are used for cutting wood... or am I wrong? Please correct me if I’m off base, maybe I am being too realistic.

We both know the answer to that Man. I just found it mildy entertaining.

Carry on.

 

[Red97]

Saws are used for cutting wood... or am I wrong? Please correct me if I’m off base, maybe I am being too realistic.

They are used for cutting wood, but the dyno is used to take all the variables out of the picture.

What size wood? The hybrid will probably smoke the 395 in small wood, to medium wood would be fun to see. And Is it the heavier rotating assembly that allows it’s long bar abilities, or will the hybrid stomp the 395 in anything?

Being these are run from full rpm to nothing, any flywheel effect will only apply when the load is first applied. As soon as the load is applied any stored energy is slowed down. Unless you wind it back up. That is the way I see it anyway.

I believe this 395 is tame, maybe even a dud.

Pretty sure that hybrid would beat it with any bar length in a bucking cut.

Hybrid can't handle the super long bars, the weight of bar/chain on the 60" would be more than the power head lol.

I need some more saws to run. Need some perspective.

 

[Fruecrue]

They are used for cutting wood, but the dyno is used to take all the variables out of the picture.





Being these are run from full rpm to nothing, any flywheel effect will only apply when the load is first applied. As soon as the load is applied any stored energy is slowed down. Unless you wind it back up. That is the way I see it anyway.

I believe this 395 is tame, maybe even a dud.

Pretty sure that hybrid would beat it with any bar length in a bucking cut.

Hybrid can't handle the super long bars, the weight of bar/chain on the 60" would be more than the power head lol.

I need some more saws to run. Need some perspective.

That’s the way I understand it as well.
I’ve been told a previous chainsaw dyno using a mechanical brake (motorcycle maybe) could generate huge numbers instantaneously by applying said brake too rapidly.
Makes sense.
As for rotating mass in a two stroke, my sentiments are as follows.
Anything more than enough to overcome the drag of friction, flywheel fan, case compression, mass airflow, compression and engine load, during the roughly 75% of one rotation that does not include the power stroke, While maintaining minimal engine speed loss, is excessive and contributes only to slow the response to change of RPM due to inertia.
Larger rotating mass does hold some stored energy once it is created, but I don’t it believe it aids in creating it, therefore it is of no benefit in a full useable RPM range dyno pull as you are exhibiting.

 

[Deets066]

That’s the way I understand it as well.
I’ve been told a previous chainsaw dyno using a mechanical brake (motorcycle maybe) could generate huge numbers instantaneously by applying said brake too rapidly.
Makes sense.
As for rotating mass in a two stroke, my sentiments are as follows.
Anything more than enough to overcome the drag of friction, flywheel fan, case compression, mass airflow, compression and engine load, during the roughly 75% of one rotation that does not include the power stroke, While maintaining minimal engine speed loss, is excessive and contributes only to slow the response to change of RPM due to inertia.
Larger rotating mass does hold some stored energy once it is created, but I don’t it believe it aids in creating it, therefore it is of no benefit in a full useable RPM range dyno pull as you are exhibiting.

Quite the statement for a plumber.....

 

[BangBang77]

An engine is an air pump, a pump's true potential is realized when loaded. A load is a load, whether it's a chain in the wood or being loaded via a dyno and resistance. The dyno does not care about cutting style, hot rod chains, or any other variables other than engine variables. Temp, mixture, engine speed and load. Its unbiased information.

Yeah, what Treelife said...

 

[Fruecrue]

Quite the statement for a plumber.....

Need me to dumb it down for you Deeter?

 

[Deets066]

Need me to dumb it down for you Deeter?

Yesp.... I’m kinda slow

 

[huskihl]

Yesp.... I’m kinda slow

It’s a rigger thing. Try sleeping in a Holiday Inn Express to see if’n it helps

 

[Redfin]

Mayhaps he can have Big double T splain it?

 

[Fruecrue]

Mayhaps he can have Big double T splain it to the beat of a Wu-Tang song?

 

[Red97]

Audio?

 

[Red97]

Need to get around to trying it.

But curious to find out the hp% gain vs the cut time % drop.

Is 25% more hp 25% quicker cuts?

Fun fun.

 

[Deets066]

Audio?

Big T spinnin Wu TANG!!!!!!

 

[Deets066]

Need to get around to trying it.

But curious to find out the hp% gain vs the cut time % drop.

Is 25% more hp 25% quicker cuts?

Fun fun.

I need to send you a saw Joe

 

[Red97]

I need to send you a saw Joe

Sounds great. I really need to get something besides my stuff on it.

Let me know, I did get the 404 sprocket. So the big ones can be run too.

3/8×7 and 404x7