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

[chadihman]

I'm beat but got the testing done tonight. My rpm sensor wouldn't read past 11500 rpms. I'd still like to test up to 13000 if I can get a shaft rpm sensor that will read that high.
Wow Randy this is a hot 261cm.

 

[Terry Syd]

Very nice!

 

[Ron660]

Great data....good job.

 

[cobey]

sweet!!

 

[Big_Wood]

just remember guys, randy's all booked up til mid october that's one heck of an increase.

 

[Duane(Pa)]

Very cool, and thanks for taking the time to do all this. I would love to get you my screw carb 261 that Randy Masterminded to see how it compares to the Mtronic. You rock Chad! What does Randy say? Something about the kind of feedback that's good to get....

 

[Duane(Pa)]

just remember guys, randy's all booked up til mid october that's one heck of an increase.

Yea, I aint' too good at math but that looks like an extra horse & a half at 10k to me!

 

[Spectre468]

Dayum!

 

[Duane(Pa)]

I don't know a lot about this stuff, and feel kind of stupid to ask, but what size rim were you using and would the Torque and/or HP numbers change if you switch rim sizes?

 

[DanTheCanadian]

OMG that thing is hot! Is that a woods port or a race port? Did you have to cement that baby down like we used to do to big blocks? What an increase!

 

[weedkilla]

Wow! Never got the ported saw high enough to see the power drop off!!

I've said this in other dyno threads - but I'll repeat it anyway - it's not peak power that shows work capacity of an engine, it's area under the graph. And that's an amazing increase in area under the graph!!!!!!!

Seriously, from 8000ish up it's making more than standard at peak.

 

[Dieselshawn]

I don't know a lot about this stuff, and feel kind of stupid to ask, but what size rim were you using and would the Torque and/or HP numbers change if you switch rim sizes?

Duane: it's a small spline 7 pin for 3/8 chain on smaller saws. There's not many selections for different sizes.

 

[OC455]

Can't wait to see what a converted 038 Super to Magnum ported will do.....impressive numbers for sure.

 

[Gopher Hunter]

Any pics of the port work?

Congrats on the very nice results

 

[AKDoug]

Puts that into 362cm territory. Impressive.

 

[CR888]

l am glad this is happening! Mastermind need not fear the dyno, thats probably the best advertisment a builder could hope for. Thanks Chad! opcorn:

 

[cgraham1]

It makes me happy that I have two saws in the works with Randy right now...

 

[weedkilla]

Chad, is this 361 run apples to apples with the 261 run? Would it be fair to compare them?A sticky where all these graphs could get dumped would be really cool.

 

[wyk]

It looks like ya need to get a different tacho for a second opinion on RPM, though.

 

[Terry Syd]

Looking at the linear rise of the power, there is a sudden dip. I wonder in this this case if it might have been some light detonation. If so, then that dip might not be there when cutting wood.

A dyno puts an extended load on an engine and the heat builds up. Maybe a flash run up to the dip might tell us more.

Chad, that dyno of yours is truly fantastic.