Another chainsaw dyno...

[Red97]

My plan is to get a few of each model, and compile an avg max hp/tq for the model, on my dyno.

Then if anyone wants to send saws in, that will be the baseline to compare against.

Still work if someone wants a before/after run done for your own port work etc.

I put 5 hours on this thing today. Very very repeatable readings. Even hours apart.

That 660 within .1hp from book rating was really nice to see.

 

[Dub11]

You a bad mfer Joe!

 

[lauren]

Joe, that is a awesome set up you have there.

 

[cus_deluxe]

looks reasonably portable too? what kind of power supply?

 

[drf256]

Fantastic work. Eliminates so many variables.

The only true way to see what small differences do to power output.

Impressive work. Kudos pal.

 

[Woodpecker]

My plan is to get a few of each model, and compile an avg max hp/tq for the model, on my dyno.

Then if anyone wants to send saws in, that will be the baseline to compare against.

Still work if someone wants a before/after run done for your own port work etc.

I put 5 hours on this thing today. Very very repeatable readings. Even hours apart.

That 660 within .1hp from book rating was really nice to see.

Sounds like a solid approach. The 7910 is still stock.

 

[Red97]

looks reasonably portable too? what kind of power supply?

Garden hose and 120v can run on 9v just not sure how long...

 

[sawmikaze]

Twice in the same day.....


I remember those days

Last week wasn't that long ago.

 

[exSW]

That is next generation cool right there Joe. Saw this on a Cub Cadet website.

 

[jk14]

Well been holding out.

Finally got tired of cutting wood.

Wanted to share my new tool with the class.

First few runs after getting everything all calibrated.

This has a built in weather station, to keep track of temp/humidity.

Those are the sae corrected numbers. Very close to the 660 book specs.

Last week's project making the "bench" and jackshaft.

This is a 30hp rated waterbrake, 17k rpm

Have A 2:1 reduction. Helps smooth out the runs with low tq saws.

Adjustable power head rest with a thick rubber cushion.

View attachment 239215 View attachment 239216 View attachment 239217

Designed it to work with Any power head I could think of. Even raise up enough for belly pipes.

If it can run a std 3/8×7 rim I can run it on the dyno.

Thoughts?

Game changer right there. Just awesome, nice work!!

 

[Red97]

That is next generation cool right there Joe.View attachment 239262 Saw this on a Cub Cadet website.

Yep, not much different that that. This uses water. So nothing ever heats up causing fluctuations.

Unless we stsrt pushing the 30hp limit... But i don't think many chainsaws will make it to 20hp on gasoline.

I need a saw that can run/idle for at least a few minutes to make a pull. Each pull is 10-20 seconds worth.

Could load a saw until it ran out of fuel if needed, just like milling situations.

 

[Lightning Performance]

Broken by water

 

[Spladle160]

Wow, awesome work. Of course I bet you could have saved a buck by just buying that cub cadet unit for $495

 

[Spladle160]

Broken by water

Water boarding?

 

[Red97]

Wow, awesome work. Of course I bet you could have saved a buck by just buying that cub cadet unit for $495

If only my grandpa would have seen that add when it was printed.

 

[exSW]

Could load a saw until it ran out of fuel if needed, just like milling situations.

That would be the perfect way to figure out the right combination for a milling saw.

 

[Red97]

That would be the perfect way to figure out the right combination for a milling saw.

Yessir, very versatile tool.

I don't have the time or desire to make race chains, Learn the technique. Firewood is almost a stretch

But I do want to build the best engine's I possibly can. Really tune them to the end user.

Race, woods, mill, wall hanger etc.

Going to be a fun adventure for sure.

 

[Woodpecker]

Lost in the dyno excitment is just how impressive that 50mm echo is!

 

[Red97]

Lost in the dyno excitment is just how impressive that 50mm echo is!

Gonna have to put that dingo to work.

 

[Dub11]

If you need more bigger Joe they got tractor pto dynos.