Another chainsaw dyno...

[Red97]

Thing I find interesting is the peak hp rpm vs in the wood rpm.

Seems most of my hybrids hold around 12k in the wood, and make peak power around 10k

Would they be quicker pulling them down?

 

[Duane(Pa)]

Thing I find interesting is the peak hp rpm vs in the wood rpm.

Seems most of my hybrids hold around 12k in the wood, and make peak power around 10k

Would they be quicker pulling them down?

Not sure? Might induce friction loss...stopwatch territory

 

[cuinrearview]

I thought it was "mangina"??

Loosely translated

 

[dall]

Loosely translated

how loose it it ?

 

[mdavlee]

im not doubting its been done and would work ok woth the right swtup, but bigmac (the message i quoted) was talkin about leaning on it, dogged in. i can think of a lot better ways to cut wood than a 5 cube saw with a 36” and a8 pin.

I have cut a ton of wood with 70cc and 34” bars with 8 pins and milled with it. I don’t see it being that bad but I don’t like carrying a 90cc powerhead through our woods unless it’s totally necessary.

 

[cuinrearview]

how loose it it ?

Eastern south-middle Ohio

 

[Deets066]

Thing I find interesting is the peak hp rpm vs in the wood rpm.

Seems most of my hybrids hold around 12k in the wood, and make peak power around 10k

Would they be quicker pulling them down?

I bet cut times would increase. Cutting at 12k is usually around self feeding territory.

 

[Red97]

I bet cut times would increase. Cutting at 12k is usually around self feeding territory.

I bet you are correct.

Hard to get it out of your head just cause it's holding at a high rpm, that isn't really where peak power is.

Some watching a video may think the extra 2k pull down is a bog? And not even pay attention to the cut times.

Once Tim shows up tomorrow he will figure it all out for us.

@cuinrearview

 

[Billy Currie]

Comparing cutting in wood to a dyno run is not a bad idea. If you dyno a drag racing engine, get it tuned right, sometimes you get it to the track and it will fall on its face. Well, that's a car of course. I don't want to seem like I am discrediting the dyno, far from it. The dyno only gauges the power plant, but it doesn't tell you how many teeth you should run on the clutch and how much to cut off the depth gauges on a chainsaw.

I'll offer this and take a step back, if peak torque on a V8 is at 4,000 RPM, you buy a 4,500 stall converter, anything lower the engine will fall below peak torque and bog (fall on it's face).

 

[Woodpecker]

Eastern south-middle Ohio

Sew like a grenaded deli counter?

 

[Sawrain]

i dont need a dyno run to know i won or lost a race. and the fastest saw doesnt always win, because of variables. the dyno eliminates every variable except the saw to give a pretty darn accurate measure of how a saw performs on its own.

It’s more fun to win with a smaller or less powerful saw even, and of course you can, but knowing you won a race, knowing you have a faster saw, knowing you have a more powerful saw and knowing you have more operator skill are 4 different things.

And in this thread at least I am most interested in only one of the aspects above.

Edit, also interested in the relation ship between Dyno and in cut performance.

Compared to say dirtbikes (maybe not in the desert) more chainsaw power can pretty much always be put to good use, where as traction limited bikes cannot, and operator skill severely trumps power, 250, 450, 500, on plenty of off-road surface, below 60mph there isn’t much acceleration/speed difference between these bikes as they all have more power than can be put down in lower gears.

 

[Bigmac]

Thing I find interesting is the peak hp rpm vs in the wood rpm.

Seems most of my hybrids hold around 12k in the wood, and make peak power around 10k

Would they be quicker pulling them down?

Ya that’s that would be the most interesting factor of testing a particular saw on the dyno and then in wood, just to see the numbers vs it’s personality in wood. I think a lot can be learned from it. I have felt form the start it would be cool to see a video of some of the stand out saws cutting just so people can see what a 7hp 8hp 10hp saw will do in general. It was super cool seeing Joe’s hybrids cut and the numbers.

 

[Bigmac]

im not doubting its been done and would work ok woth the right swtup, but bigmac (the message i quoted) was talkin about leaning on it, dogged in. i can think of a lot better ways to cut wood than a 5 cube saw with a 36” and a8 pin.

If the 5 cube saw has more torque and hp than a bigger saw then why would you? (As long as the Oiler keeps up) I have an 076 that 111cc and won’t get out of its own way, I would much rather use a modded 461 8pin 36. I haven’t ran a saw that’s verified 10+ hp and am curious to it’s abilities, so I asked. Love the dyno, love the discussions, an I don’t doubt the accuracy of the dyno. I am just trying to fully understand what the graph looks like compared to a saws personally and capabilities.

 

[Stump Shot]

I've herd tale from some of these classic mag saw dudes that baking the coil can "restore" them.

I think it was @sawnami that mentioned it before.

Baking won't restore the module inside a modern coil.

 

[Dub11]

Baking won't restore the module inside a modern coil.

Stupid technology

 

[breese]

Now if I had the software, it would average/smooth a long run to fit my normal graph size. But sadly I can't seem to get that to work.

What's wrong? Something with the hardware and OS, the connection, etc?
I am a systems engineer if I can help....

 

[Wolverine]

The dyno doesn’t lie, and the facts can be offensive.


Another good one:
"With some folks there is no sense in confusing them with facts because their minds are already made up"

 

[cus_deluxe]

I have an 076 that 111cc and won’t get out of its own way, I would much rather use a modded 461 8pin 36.

thats a ridiculous comparison honestly, who wouldnt rather use a great modern saw instead of a giant heavy turd. im just saying if i had to choose a saw that i own to run a 36” 8 pin bar and chain, to buck up a bunch of logs, id grab my 394, not a five cube saw. i guess im just out in left field as far as that goes.

 

[Catman]

I think variables is the most used word on OPEforum.

It varies from post-to post LOL!

 

[GCJenks204]

I think variables is the most used word on OPEforum.

"Dik" and "Slacker" must be in the top three...