Stihl MS 461 has me confused on dyno test.

[Trx250r180]

I been getting these for the 044 046 without screens. Insides are wide open too.

iv'e always been scared to run no screens on the stihls ,seems like when i change my chain ,sawdust always falls on the muffler

 

[LegDeLimber]

well heck, just chalk it up to my OCD and forgive me if I think something to death.
just sorta enthused and want to see the dyno prove it's self.

things have dried out a bit, so I'll shut up for now and go tackle a couple things around the homestead.

 

[redoakneck]

I also worry about no screens because bugs can crawl in there and cause an unwanted foreign body.

 

[Hedgerow]

iv'e always been scared to run no screens on the stihls ,seems like when i change my chain ,sawdust always falls on the muffler

2-strokes will burn that too...
No worries...

 

[moody]

2-strokes will burn that too...
No worries...

There's a slightly tampered with 026 that loves saw dust :hmm3grin2orange:

 

[SawTroll]

My first question would be how accurate that dyno is, and if it really is calibrated right?

The next would be what rpm the numbers are measured at (or if they are max numbers), and if you have looked for differences elsewhere in the power curves. The max numbers are just a snapshot from the curve.....

 

[chadihman]

well heck, just chalk it up to my OCD and forgive me if I think something to death.
just sorta enthused and want to see the dyno prove it's self.

things have dried out a bit, so I'll shut up for now and go tackle a couple things around the homestead.

Hey man don't take it the wrong way. I really like the thinkers on here. It makes me think more. As far as I know the oil temp should have no change in my readings. No flow meter or pressure sensors used on this dyno. Flow meters and pressure sensors would be hard to read due to changing oil temps and viscosity.

 

[chadihman]

My first question would be how accurate that dyno is, and if it really is calibrated right?

The next would be what rpm the numbers are measured at (or if they are max numbers), and if you have looked for differences elsewhere in the power curves. The max numbers are just a snapshot from the curve.....

I do know this dyno will pick up on small hp changes. I'm thinking of selling my MS 660 to help pay for a data acquisition system that figures in weather conditions and makes a nice torque/ hp curve that I can print out. I find it nice to have a base saw for comparing to. I'll have this thing professionally calibrated if I can send the bill to you Niko. It's proven itself to me that it accurately shows torque and hp changes and it didn't break the bank yet.
Did you miss the threads about me talking about pulling the saw down 500 rpms at a time and and filling a notebook page full of chicken scratch? The max hp is at 9000-9500 rpms. the 460 maxed at 9000 but held close from 9500-8000. I'll accept donations to help pay for my data acquisition system:hmm3grin2orange:

 

[SawTroll]

Thanks for being honest! :msp_smile:

 

[Justsaws]

I do know this dyno will pick up on small hp changes. I'm thinking of selling my MS 660 to help pay for a data acquisition system that figures in weather conditions and makes a nice torque/ hp curve that I can print out. I find it nice to have a base saw for comparing to. I'll have this thing professionally calibrated if I can send the bill to you Niko. It's proven itself to me that it accurately shows torque and hp changes and it didn't break the bank yet.
Did you miss the threads about me talking about pulling the saw down 500 rpms at a time and and filling a notebook page full of chicken scratch? The max hp is at 9000-9500 rpms. the 460 maxed at 9000 but held close from 9500-8000. I'll accept donations to help pay for my data acquisition system:hmm3grin2orange:

Do not get bogged down in the perfection of the system to the point of it being a distraction. You have a system that allows you to measure change and gives relative results, work with it until you are able to make additional changes that you want. Base line equality is the holy grail of comparison. Selling a saw to pay for changes to a machine that tests saws seems wrong.

If you are concerned about heat then measure the external temp of the affected parts and work to achieve a system of operation that allows the saws to be run with machine at a similar temp range.

Have some fun, blow up some saws, block off some muffler openings, melts some pistons. Also I recommend that before each test you stand up and shout "Stand back, I'm doing the science."

 

[Mike from Maine]

I'll accept donations to help pay for my data acquisition system:hmm3grin2orange:

Have you thought about selling stickers?

They seem awfully popular around here.

 

[RiverRocket]

Sell the dino you have now for 20% more than you have in it...Lets call this Model the Chadster 500A
Then You Can Build The Chadster 500B with the new upgrades
You could then sell the upgrade as an option to the proud owner of the original 500A model..:msp_biggrin:

 

[chadihman]

Sell the dino you have now for 20% more than you have in it...Lets call this Model the Chadster 500A
Then You Can Build The Chadster 500B with the new upgrades
You could then sell the upgrade as an option to the proud owner of the original 500A model..:msp_biggrin:

Thanks for my first laugh of the day. My wife thought that was funny also.:msp_biggrin:

 

[chadihman]

I also worry about no screens because bugs can crawl in there and cause an unwanted foreign body.

Probably not a problem unless the bugs have turds of steel.

 

[ernurse]

Now you got me wishing I left the muffler of my 441c-m alone. It's not broken in yet so I cant really feel a difference. My ms660 I can definitely feel the difference in power of the non-US large DP muffler......but maybe I didn't need to remove the internals. :msp_confused:

 

[imagineero]

Do not get bogged down in the perfection of the system to the point of it being a distraction. You have a system that allows you to measure change and gives relative results, work with it until you are able to make additional changes that you want. Base line equality is the holy grail of comparison. Selling a saw to pay for changes to a machine that tests saws seems wrong.

I gotta disagree. The variables may be so significant that they negate the benefits of measuring at all. False data is worse than no data. If the oil temp/dyno temp/humidity/whatever change the data enough, then it may tell you that the mods you made gained you power when in fact you lost power. There's something to be said for timing cuts in the same log.

 

[chadihman]

Now you got me wishing I left the muffler of my 441c-m alone. It's not broken in yet so I cant really feel a difference. My ms660 I can definitely feel the difference in power of the non-US large DP muffler......but maybe I didn't need to remove the internals. :msp_confused:

I'm afraid this dyno will reveal a lot of unknown's. I sure don't want to upset the pro saw builders.

 

[chadihman]

I gotta disagree. The variables may be so significant that they negate the benefits of measuring at all. False data is worse than no data. If the oil temp/dyno temp/humidity/whatever change the data enough, then it may tell you that the mods you made gained you power when in fact you lost power. There's something to be said for timing cuts in the same log.

Sh#t I better throw this thing in the scrap pile. Could everyone please remember that I stated I could have had a Cadillac but settled for a Chevy. Also rember that I do all my tests against a base saw witch is my OEM 460. This gives me a baseline every time I start. The 460 changes some in power from day to day with weather changes but the 460 gives me the same #'s every time in a few hour test time. Sorry if that came out wrong. I just ask that you quit bashing my Chevy cause its not a Cadillac.

 

[imagineero]

Really? Every time you start?

That sure sounds tedious

 

[blsnelling]

My first question would be how accurate that dyno is, and if it really is calibrated right?

The next would be what rpm the numbers are measured at (or if they are max numbers), and if you have looked for differences elsewhere in the power curves. The max numbers are just a snapshot from the curve.....

It need not be perfectly calibrated to show changes from mod to mod.