Dyno tested...... Mastermind Ported 660 vs Stock 660 vs Dual port 660

[chadihman]

I've never been such a believer in a ported saw till I got some on my dyno. Amazing!!!!

 

[old-cat]

That Monkey mind sure knows how to turn that 660 ON!!!!

 

[treesmith]

I can vouch for just how impressive a mastermind 660 is, an amazing saw

 

[weedkilla]

That's amazing. Thanks for sharing.

 

[Moparmyway]

Thats a 2hp increase across the board ................... AWESOME !!

 

[redfin]

A tad optimistic on their advertised numbers is Stihl. Thanks Chad.

 

[NWCoaster]

A tad optimistic on their advertised numbers is Stihl. Thanks Chad.

On this 660 anyways... according to that it is making less power stock than the 461 he tested???? I thought I remember the 461 being right on 6HP stock as advertised.

 

[NWCoaster]

That is pretty sad when a Dual port muffler adds around .8 HP.... hard to believe it couldn't leave the factory that way with emissions still intact. That is pretty embarrassing.

 

[NWCoaster]

Definitely would like to send my 461 to Mr. Monkey......... ok.... I'm starting to talk to myself here.........

 

[GrassGuerilla]

Nice work Chadihman, and dang Nice work Randy. It has to make you proud to wring that kinda increases out of a saw that has had so many engineering hours spent. Seriously man, that's commendable. From your saw shed your handing the engineers (and marketing) their asses.

Another Thanks for showing us that it takes a dual port 660 to get the hp they claim on an 046.

 

[cgraham1]

I've never been such a believer in a ported saw till I got some on my dyno. Amazing!!!!

Thanks for sharing!!!

 

[Mastermind]

Hopefully this dyno thread will turn out better than that last one did.

 

[Time's Standing Stihl]

Unreal! Randy, you do some amazing work! Thanks for sharing Chad

 

[Ron660]

Here's the percent increases of the ported 660 compared to the stock 660:
RPM's % >
8500 = 35.4%
9000 = 37.5%
10000 = 59.7%
11000 = 73.7%
12000 = 180%

 

[Ron660]

Here's the percent increases of the ported 660 compared to the ported 461:
RPM's %>
8000 = 19.1%
9000 = 15.8%
10000 = 13.7%
11000 = 16.5%
11500 = 19.3%
12000 = 77.7%

 

[Tree Sling'r]

I've never been such a believer in a ported saw till I got some on my dyno. Amazing!!!!

Very nice. Thanks Chad.

 

[Tree Sling'r]

Hopefully this dyno thread will turn out better than that last one did.

Brush Ape will be here soon.

 

[Deets066]

Isn't there supposed to be a funny dip in there somewhere!? .
Nice work on both ends fellas

 

[blsnelling]

Looks fantastic!

 

[Mastermind]

Here's the percent increases of the ported 660 compared to the stock 660:
RPM's % >
8500 = 35.4%
9000 = 37.5%
10000 = 59.7%
11000 = 73.7%
12000 = 180%

I couldn't believe that these numbers were correct.......I argued with Ron that he was crazy. I said no way in hell was this correct.

But it is. He finally got it thru my thick head.

http://www.percentagecalculator.net/