Dyno tested....Mastermind's ported 261cm vs Stock 261cm Gotta see this one.

[Knobby57]

I'm not surprised by the numbers . My mastermind 261 cm will run with a muffler ported 361 all day long . Is a very angry little saw. My local dealer is a good friend of my fathers and is very skeptical of modded saws and saw no reason for it. I let him run a few tanks through my 261 and he was surprised. He told me later he pulled the covers to make sure it was a 261 with a factory cylinder. He also asked me why I didn't buy the saw from him .... Whoops


Sent from my iPhone using Tapatalk

 

[DexterDay]

Nice work to both Chad and Randy!! That is a very, very impressive gain on the stock saw! I have a few done by Randy. All are nothing short of phenomenal. They run with much bigger saws.

Now I wanna see a Stock 460 Mag vs Ported 460 Mag!

I have one I will send in for testing. It's a mean Mo-Fo!

(Or 362C-M and/or 441C-M )

 

[Dieselshawn]

Is the 261 using a dual port style muffler?

 

[chadihman]

Is the 261 using a dual port style muffler?

Randy's 261 has a dual port made by him I think

 

[CR888]

Brad Snelling did a pre Mtronic MS261 for me and it happily sits around 11500rpm in the cut in some pretty nasty wood. l also had the exact same saw stock and it would hold around 9500 in the cut. l have a small tach mounted on my ported 261. Funny thing is out ouf the cut they were both tuned in the 13000's but in the cut well loaded the ported saw held alot more rpm. l like a well ported saw.

 

[Dieselshawn]

Chad: yes, dual port made by randy, they work well even on small saws.

 

[Mastermind]

This is our current muffler mod for the MS261.

Rivet nuts are installed in the can.......no sheet metal screws.....

We are now using a smaller button head fastener though.

 

[SquareFile]

Where do you get the less restrictive screen?

 

[Mastermind]

http://www.amazon.com/gp/product/B005H3C9DG/ref=oh_details_o06_s00_i00?ie=UTF8&psc=1

 

[redfin]

Hopefully my imitation is flattering Randy. Those little rivet nuts are great to work with. I just beat out a deflector with the anvil.

 

[chadihman]

I had to remove the 7 pin .325 sprocket and install a 7 pin .375 sprocket to run on the dyno. Wouldn't this ported 261 cm run a 3/8 square ground chain on a 20" bar better than a .325?

 

[Hedgerow]

I had to remove the 7 pin .325 sprocket and install a 7 pin .375 sprocket to run on the dyno. Wouldn't this ported 261 cm run a 3/8 square ground chain on a 20" bar better than a .325?

If it has a good oiler, absolutely..

 

[Hedgerow]

IMHO, anything that is 4hp or better should be running 3/8 anyway...
Round or square.

 

[chadihman]

IMHO, anything that is 4hp or better should be running 3/8 anyway...
Round or square.

I was thinking the same thing

 

[Mastermind]

Jon grinds a nice .325 in square that I really like. It's very smooth in the cut.

 

[Hedgerow]

I was thinking the same thing

Heck, I run a 20" bar with 3/8" on my stock 5100...
It ain't even 4hp...
But I have a file and a fair to midlin' brain...

Ok...
Maybe barely adequate...

 

[Hedgerow]

Jon grinds a nice .325 in square that I really like. It's very smooth in the cut.

It is...
I'll attest to that...
We used that loop up you sent with the Deere...
I just kept touching it up square it cut so nice...

 

[Derrick Johnson]

This is way too cool I want a saw Dyno

 

[Hedgerow]

This is way too cool I want a saw Dyno

Send Chad the alky saw...
Just tell him to hurry when he's getting readings.!!!

 

[chadihman]

I want to test a ported 461 from Mastermind. Anybody want to send me one before I send my 461 for porting?