Another chainsaw dyno...

[Nutball]

What about changing the units to kW? 5.2kW is much closer to the advertised power.

 

[Dieselshawn]

Ok, the 661 and 660 both made 3.878 Kilo Watts.

 

[Dieselshawn]

So the listed flywheel power on stihl website says 5.4 KW.

Both the 660 and 661 Saw made 3.878.

Driveline loss of 28 percent through the chain and spinning the shaft.

Maybe my chain is worn out from many dyno pulls.

The chain was worn out to begin with. We just cut the cutters off for safety.

 

[Nutball]

It would be interesting to know where the losses are all coming from and how much you can reduce them. Would a higher ratio help?

 

[davidwyby]

It would be interesting to know where the losses are all coming from and how much you can reduce them. Would a higher ratio help?

Thynsetic bar ole ;-D

 

[wcorey]

Need to put a known quantity on that dyno, a good running stock saw that's well broken in and is typically consistent from one unit to the next (like not a 660, lol) and calibrate to it by adjusting the scale or arm length.

 

[Dieselshawn]

Need to put a known quantity on that dyno, a good running stock saw that's well broken in and is typically consistent from one unit to the next (like not a 660, lol) and calibrate to it by adjusting the scale or arm length.

That’s what I’m attempting to do now.

I’ve only got my dyno in my garage for a couple weeks since getting it from a friend that I made it for.

 

[davidwyby]

Be interesting to compare the two of ya’s results on the different dynos with the same saw


Oh and we do have one more oil thread we need to do…and this is the perfect thread for it to spring from…which oil makes the most Powa! Maybe gas while we’re at it…pump vs. aspen vs trufuel er whatever

 

[Dieselshawn]

So, the 661’s really are choked up saws.

I used the back piece of the muffler that has the baffle removed and a large hole through the factory opening that Mastermind did years ago.

I didn’t have a muffler cover or anything made for the front except I used the crushed cover from the injured saw’s original muffler.

I don’t have a pic yet due to the phone dying on me at the last minute. I will have that tomorrow.

The crushed cover left an open gap on top and a large gap on the recoil side.

1.5 hp increase and shifted the power band to 10,000 rpms from 9,000.



As for noise, it’s pretty up there. My sound proofed garage had trouble keeping the noise level down.

This is at almost 10 pm in town with houses around me and I’m running modified saws on the dyno wide open.

The lady in my house came out to tell me to keep the noise down.

My mastermind 660 on the dyno to her in the house was “Ehhh, nothing much to bother anyone about.”

 

[Dieselshawn]

Here’s the banged up muffler cover over a Mastermind modded back piece.

 

[Red97]

Nice gains from one of those other brands.

 

[Woodpecker]

Nice gains from one of those other brands.

View attachment 306958 View attachment 306959

Wow!

 

[Egg Shooter]

Nice gains from one of those other brands.

View attachment 306958 View attachment 306959

Impressive. Who makes Cub Cadet saws?

 

[Red97]

Impressive. Who makes Cub Cadet saws?

Thank you
Efco.

 

[Egg Shooter]

Thank you
Efco.

That's a brand I don't hear much about. There is / was a dealer north of me in Newera I think it was. Didn't even pay attention last time I was in there.

 

[cuinrearview]

That's a brand I don't hear much about. There is / was a dealer north of me in Newera I think it was. Didn't even pay attention last time I was in there.

There is still a place selling Efco down here in Marshall. I've almost bought one in green, yellow, and red but never sealed the deal.

 

[Red97]

There is still a place selling Efco down here in Marshall. I've almost bought one in green, yellow, and red but never sealed the deal.

Not gonna lie. I was very happy to see the cylinder on this 52cc... I think with a few more tires it could be a real runner....

 

[Egg Shooter]

There is still a place selling Efco down here in Marshall. I've almost bought one in green, yellow, and red but never sealed the deal.

All the colors of the rainbow

 

[Egg Shooter]

Not gonna lie. I was very happy to see the cylinder on this 52cc... I think with a few more tires it could be a real runner....

Are they Italian or something?

 

[Egg Shooter]

Looks like as of 2013 their home owner stuff was assembled in China and the pro Made in Italy.