Another chainsaw dyno...

[Duane(Pa)]

Cfb 880 vs ported 3120 both woods port type builds

View attachment 251211

Shorter pull window on the 3120, but you can still get a good idea what the curve looks like.

Pick your poison.

 

[Cobby08]

Pick your poison.

Both toooooo heavy haha.

 

[Red97]

What I am finding fascinating and mind boggling at the same time is how dyno power and in-the-wood power don’t fully correlate.

I wonder if it’s peak TQ at rpm for chain speed that makes the difference, has to be.

You have an example in mind? I can graph them together.

Would be ideal to get 2 saws that's were tested same bar/chain and on the dyno. Just to see some if the differences jump out when looking.

 

[MustangMike]

For me what impressed/fooled me was the power my saw has down low, you can lean on it and it usually just cuts faster even when noodling hardwood.

Very few smaller displacement saws have 8 Hp at 7,500 RPM, and you would have to really dog it to get below that!

 

[mgr1]

For me what impressed/fooled me was the power my saw has down low, you can lean on it and it usually just cuts faster even when noodling hardwood.

Very few smaller displacement saws have 8 Hp at 7,500 RPM, and you would have to really dog it to get below that!

Thats the key i think.
You can slow the rpm's down from 11,000 rpm's to 7,500 rpm's but there are stil 8 horses kicking arround.

 

[srcarr52]

For me what impressed/fooled me was the power my saw has down low, you can lean on it and it usually just cuts faster even when noodling hardwood.

Very few smaller displacement saws have 8 Hp at 7,500 RPM, and you would have to really dog it to get below that!

Are you still boasting about your mediocre chicom 660?

 

[RI Chevy]

For me what impressed/fooled me was the power my saw has down low, you can lean on it and it usually just cuts faster even when noodling hardwood.

Very few smaller displacement saws have 8 Hp at 7,500 RPM, and you would have to really dog it to get below that!

Mike, it's your chain...
I can give you a chain that will stop your saw long before you hang off the handle leaning on it...
ALL IN THE CHAIN...

 

[Bigmac]

You have an example in mind? I can graph them together.

Would be ideal to get 2 saws that's were tested same bar/chain and on the dyno. Just to see some if the differences jump out when looking.

Ya that’s what I would like to know/see, it would be cool to see a video of the two saws in question and the dyno graphs to see the real dyno vs wood differences.

 

[huskyboy]

What I am finding fascinating and mind boggling at the same time is how dyno power and in-the-wood power don’t fully correlate.

I wonder if it’s peak TQ at rpm for chain speed that makes the difference, has to be.

Rotating mass along with a few other things I think is some of the equation if I had to guess. But what do I know? Lol. I think if one reads the graphs closely it can paint some of the picture how they perform in the cut.

 

[Bigmac]

Rotating mass along with a few other things I think is some of the equation if I had to guess. But what do I know? Lol

I agree, inertia is a big factor in the wood, big saws have that hard to stop feel, but may not have more power

 

[Bjorn]

If the chain is backwards You can lean on it and it dont stop

 

[Definitive Dave]

Ya that’s what I would like to know/see, it would be cool to see a video of the two saws in question and the dyno graphs to see the real dyno vs wood differences.

i am hoping to take a bunch of saws up to visit Joe and his dyno for a day or two. I could certainly take a cant and bar and chain along to measure two of the same saw in the wood and dyno. Maybe a bone stock 365 special and a radically ported version of the same saw?

 

[Bjorn]

i am hoping to take a bunch of saws up to visit Joe and his dyno for a day or two. I could certainly take a cant and bar and chain along to measure two of the same saw in the wood and dyno. Maybe a bone stock 365 special and a radically ported version of the same saw?

go for it and test a methanol and nitro saw too

 

[Definitive Dave]

I agree, inertia is a big factor in the wood, big saws have that hard to stop feel, but may not have more power

Inertia is important but fleeting. Racers will run a skeletonized lightened flywheel, a stock flywheel and a balanced overweight flywheel sometimes to see which is faster on three cuts in a cant. With having to cold start on the ground and make up/down/up cuts the lightened flywheel almost always wins but the heavy is best in a single cut hot over the wood.
Dave

 

[Definitive Dave]

go for it and test a methanol and nitro saw too

We need to be careful with Joe’s dyno we dont want to break it for others, but i would love to see my nitro 026 up against a bunch of other three cubes i have

 

[Armbru84]

go for it and test a methanol and nitro saw too

its been done already...Joe had to clean his shorts after that.

 

[Red97]

its been done already...Joe had to clean his shorts after that.

You have no proof...

 

[Armbru84]

You have no proof...

true. I can bring the avatar saw if you want...

 

[Bjorn]

Hi, diapers are Cheap, I pay, But I would like to watch the test.

 

[Red97]

View attachment 251159

Stock j red 2065 vs xs365

This xs365 has a pretty good record in the 8x8.

i am hoping to take a bunch of saws up to visit Joe and his dyno for a day or two. I could certainly take a cant and bar and chain along to measure two of the same saw in the wood and dyno. Maybe a bone stock 365 special and a radically ported version of the same saw?

I'm not sure if a 8x8 is enough to show the difference. I hear that xs tecomec 365 is quite the contender in 8x8... at 7.5hp it is leaps and bounds above stock. I'm sure it has bested plenty of other 8+hp woods saws at the gtg.